Q/BQB 485-2023 (Q/BQB485-2023, QBQB 485-2023, QBQB485-2023) & related versions
Q/BQB 485-2021 English name.Cold-rolled grain-oriented electrical steel strip delivered in the fully processed state
Q/BQB 485-2021
Replaces Q/BQB 485-2020
Full-process cold-rolled grain-oriented electrical steel strip
release
1 Scope
This document specifies the full-process cold rolling with nominal thickness of 0.18mm, 0.20mm, 0.23mm, 0.27mm, 0.30mm and 0.35mm
Definition, classification and code name, size, shape, weight, magnetic properties, inspection and test, packaging, marking and quality certification of grain-oriented electrical steel strip
book etc.
This document is applicable to the full-process cold-rolled grain-oriented electrical steel strip produced by Baoshan Iron and Steel Co., Ltd. and delivered in the final annealed state (indicated by
hereinafter referred to as the product).
2 Normative references
The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, the dated citation
documents, only the version corresponding to the date applies to this document; for undated reference documents, the latest version (including all amendments) applies
in this document.
GB/T 228.1 Tensile test of metallic materials Part 1.Experimental method at room temperature
GB/T 247 General regulations on packaging, marking and quality certificate of steel plate and steel strip
GB/T 2521.2 Full-process cold-rolled electrical steel Part 2.Grain-oriented steel strip (sheet)
GB/T 2522 Test methods for surface insulation resistance and coating adhesion of electrical steel sheets (strips)
GB/T 2900.60 Electrotechnical Terminology Electromagnetics
GB/T 3655 Method for measuring magnetic properties of electrical steel sheets (strips) using Epstein square circles
GB/T 4340.1 Vickers hardness test of metallic materials Part 1.Test method
GB/T 8170 Numerical rounding off rules and expression and determination of limit values
GB/T 9637 Electrotechnical Terminology Magnetic Materials and Components
GB/T 13789 Measurement method for measuring magnetic properties of electrical steel sheets (strips) with a single sheet tester
GB/T 17505 General Technical Requirements for Delivery of Steel and Steel Products
GB/T 18253 Types of inspection documents for steel and steel products
GB/T 19289 Measurement methods for density, resistivity and stacking coefficient of electrical steel sheets (strips)
YB/T 4292 Test method for geometrical properties of electrical steel strip (sheet)
Q/BQB 400 Packaging, marking and inspection documents of cold-rolled products
3 Terms and Definitions
The terms defined in GB/T 2521.2, GB/T 2900.60, GB/T 9637 and YB/T 4292 and the following terms apply to this document.
4 categories
The grade of the material in this document is based on the nominal value of the maximum specific total loss P1.7/50 (W/kg) at a magnetic polarization of 1.7T and a frequency of 50Hz.
The grades are classified according to the nominal thickness of the material, and are subdivided into common type, high magnetic polarization type, magnetic domain refinement type,
Heat-resistant magnetic domain refinement type, low noise type, special type for distribution transformers, special type for UHV transformers, and non-coating type.
5 Symbols and grades
5.1 Symbols and descriptions
The symbols and corresponding descriptions in this document are given in Table 1.
5.3 The classification and code of the insulating coating shall comply with the provisions in Table 2.
6 General requirements
6.1 Production process
The production process and chemical composition of the product are determined by the manufacturer.
6.2 Delivery form
The products are supplied in coils, referred to as steel coils. When the edge state is not specified in the order contract, the product will be supplied in the trimmed state.
6.2.1 The weight of the steel coil should meet the order requirements, and the coil weight is generally 2.00 to 6.00 tons.
6.2.2 Steel coils are usually delivered in trimmed state. When the user has special requirements, it can be delivered without trimming through the agreement.
6.2.3 The inner diameter of the steel coil should be within the range of 500mm to 520mm, and the recommended inner diameter is 508±5mm.
6.2.4 Steel coils should be wound continuously and tightly by steel strips of the same width, and the sides of the coils should be as straight as possible, and the coils should not collapse under their own weight.
6.2.5 The product may have joints or welds due to removal of defects, the joints or welds should be marked, and the front and rear parts of the joints or welds should be
The same grade, and no more than 2 places, the length of the steel strip between welds should not be less than.200 meters.
6.2.6 Except for uncoated series products, both sides of the product are coated with insulating coating.
6.2.7 When the user has special requirements, it shall comply with the order agreement.
6.3 Delivery status
The products are delivered in the final annealed state. The coated products are coated with insulating coating on both sides, and the uncoated series products have no primer and insulating coating on the surface.
layer. The type of insulating coating is determined by the supplier according to its own production process, and can also be determined through negotiation between the supplier and the buyer.
6.4 Surface conditions
6.4.1 The surface of the product should be smooth and clean, free from grease, rust, and defects that affect its use.
6.4.2 The surface of the product is allowed to have substrate defects, bottom layer defects, and insulating coating defects that do not affect the normal use of the material, such as slight scratches,
Defects such as roll printing, color difference, dew crystals, color spots, small white spots, small bubbles, cracks, etc.
6.4.3 The insulating coating on the surface of the product should be well adhered, and the color of the coating should be uniform, so as to ensure the
It does not fall off when annealed under the stress relief annealing conditions,
6.4.4 When the product is delivered with welds or defects, blank paper should be inserted. When necessary, the marking form of the relevant blank paper shall be agreed upon by the supplier and the purchaser.
and specified in the contract.
Note. If the agreement specifies that the product will be used submerged in a liquid, ensure compatibility between the liquid and the coating.
6.5 Shear adaptability
The product shall be readily and accurately cut into the usual shape at any position with suitable cutting tools.
7 Technical Requirements
7.1 Magnetic properties
7.1.1 The characteristics of the cold-rolled grain-oriented electrical steel provided under the conditions of 6.3 shall comply with Table 3, Table 4, Table 5, Table 6, Table 7, Table 8 and Table 9
The provisions of the aging sample should also meet these characteristics. For coated products, the mass of the insulating coating shall be taken into account.
7.1.2 The magnetic properties of ordinary type, high magnetic polarization type, and heat-resistant notch magnetic domain refinement type products in Table 3, Table 4 and Table 6 should be in accordance with GB/T
3655 test, before the test, the sample should be subjected to stress relief annealing under the conditions provided by the manufacturer (usually within the range of stress relief annealing temperature
temperature range is 800°C±20°C, the annealing time is 2h, and the furnace is cooled after annealing); but the non-heat-resistant magnetic domain refinement method (such as laser scribing) in Table 5
The magnetic properties of the produced products should be tested according to GB/T 13789, and the samples do not need to be annealed for stress relief before testing. After negotiation between the supply and demand sides,
The magnetic properties of the products listed in Table 3, Table 4 and Table 6 can also be tested according to GB/T 13789.
7.1.3 For the magnetic performance test methods of each series of products in Table 7, Table 8 and Table 9, according to the product type, refer to the provisions in Article 7.1.2 of this document.
set to execute.
7.1.4 The magnetic polarization J800 obtained under the condition of magnetic field strength H = 800 A/m shall comply with Table 3, Table 4, Table 5, Table 6, Table 7,
The provisions of Table 8 and Table 9, wherein the magnetic polarization value J800 measured by the GB/T 13789 method for the same product is higher than that measured by the GB/T 3655 method
The measured magnetic polarization values are low.
7.1.5 Under the conditions of the same product with a magnetic polarization of 1.7T and a frequency of 50Hz or 60Hz, the 50Hz and
The specific total loss value under 60Hz is based on the conversion factor Fc=0.925 specified in IEC 6040-8-7 Edition 5.0 2020-09
Conversion, the converted P1.7/50 and P1.7/60 shall meet the requirements in Table 3, Table 4, Table 5, Table 6, Table 7, Table 8 and Table 9.
7.1.6 Under the conditions of magnetic polarization of 1.5T and frequency of 50Hz or 60Hz, the specific total
For the loss value, refer to the relationship C.2a specified in Appendix C of GB/T 13789-2008.Data conversion to the square circle method, the ratio obtained by the two detection methods
For the fitting relationship of the total loss conversion factor δP, refer to the relational formula C.3a in Appendix C of GB/T 13789-2008, where the valid range of fitting is
1.0T～1.8T, and this conversion relationship is only applicable to laser-marked products with a thickness of 0.23mm and above, and thickness specifications of 0.20mm and below
The conversion relationship of laser-marked products is specially regulated according to the results of actual testing and application comparison experiments. When suppliers and users negotiate on P1.5/50
When there are clear requirements for P1.5/60, the converted P1.5/50 and P1.5/60 shall meet the requirements in Table 3, Table 4, Table 5, Table 6, Table 7, Table 8 and Table 9.
7.1.7 Under other test conditions, the conversion factor Fc can be determined through negotiation between the supplier and the user.
7.1.8 When the magnetization curve needs to be provided, the data measured according to GB/T 13789 single chip method refer to the relational formula in Appendix C of GB/T 13789-2008
convert.
Note 1.The magnetic induction has been used for many years, but in fact the Epstein square circle and the monolithic tester measure the magnetic polarization. Magnetic induction and magnetic poles
The relationship between chemical strength. J=B-µ0H, under the condition of H=800A/m, the difference between B and J is about 0.001T.
7.3.2 Width
The nominal width W of the product ranges from 750mm< W≤1270mm. The allowable deviation of the width of the parent roll of the trimmed supply should be 0
0.5mm. user
When there are special requirements, the delivery can be made in the raw edge state through agreement, and the allowable deviation of the width is separately agreed upon by the supplier and the buyer through the agreement.
7.3.3 Sickle
The detection of product camber is suitable for trimming materials with a width of not less than 150mm, and any product camber with a length of 1000mm should not exceed
0.50mm. If the supplier can guarantee it, the test may not be carried out.
7.3.4 Roughness and wave height
The detection of product unevenness is suitable for materials with a width of not less than 150mm. The unevenness should not exceed 1.0%, and the wave height should not exceed 2.5mm.
7.3.5 Residual curvature
According to the requirements of the buyer and specified in the contract, the residual curvature can be tested for products with a width of not less than 150mm, and the bottom edge and
The distance between the support plates should not exceed 10mm. If the supplier can guarantee it, the test may not be carried out.
7.3.6 Burr height
The shear burr height of trimmed products should not exceed 0.020mm.
7.4 Technical characteristics
7.4.1 Density
The agreed density for calculating the magnetic properties and stacking factor is 7.65×103 kg/m3.
7.4.2 Stack factor
The minimum stacking factor of the product shall comply with the provisions in Table 3, Table 4, Table 5, Table 6, Table 7, Table 8 and Table 9.
7.4.3 Bending times
The minimum bending times of the product parallel to the rolling direction shall not be less than 1 time. If the supplier can guarantee it, the test may not be carried out.
7.4.4 Deflection of sheared edges due to internal stresses
Products should avoid internal stress as much as possible. According to the requirements of the buyer and specified in the contract, materials with a width of not less than 500mm can be used
(Material after slitting and slitting) Detect the shear edge deviation caused by internal stress, and the measured value of the gap should not exceed 1mm. If the supplier can guarantee,
This test may not be performed.
8 Inspection and testing
8.1 General requirements
8.1.1 When signing an order agreement according to this document, the user can carry out specified inspection and test or non-specified inspection and test according to the provisions of GB/T 17505.
However, for non-specified inspections and tests, the manufacturer shall provide the specific total loss and magnetic polarization values of the required products.
8.1.2 When ordering according to the specified inspection and test, the user should specify the type of inspection documents in GB/T 18253.
8.1.3 Steel coils should be batched by coil, and generally one coil constitutes an acceptance batch.
8.1.4 Unless otherwise agreed, the provisions of 8.1.3 apply to deflections of sheared edges due to internal stresses, coating insulation resistance, geometrical properties and
Tolerance inspection.
8.1.5 When the product is supplied in the form of reels, the test results on the original acceptance batch are applicable to the reels.
8.2 Sampling
8.2.1 Sampling shall be taken from each acceptance batch.
8.2.2 The innermost and outermost rings of the product should be regarded as packaging materials, which do not represent the quality of the entire steel coil, and samples should not be taken from this part. sample
Welds and splice areas should be avoided.
8.2.3 The sampling location shall be no less than 3m from the head and tail ends of the product, and no less than 15mm from the edge of the product. For large monolithic magnetic properties, insulation
For test items with special sampling requirements such as coating adhesion, samples shall be taken in accordance with the provisions of Appendix A.
8.2.4 By properly arranging the test sequence, the same sub-specimen can be used to test multiple characteristics.
8.3 Surface appearance inspection
The surface appearance quality of the product is inspected with the naked eye.
8.4 Measurement of size and shape
8.4.1 Dimensions and shape
Appropriate measuring tools should be used for measurement. The measuring position is not less than 3m from the head and tail ends of the product.
8.4.2 Measurement of thickness
The thickness of the trimmed steel strip shall be measured at any position not less than 15mm from the edge. The accuracy of the micrometer used for the measurement should be
0.001mm.
8.4.3 Measurement of roughness (waviness)
Measure the height (h) and wavelength (l) of the maximum wave of the product, and calculate the roughness (h/l)×100% of the product, as shown in Figure 1.
8.4.4 Measurement of glitch (h)
Measure the thickness h2 and h1 of the shearing part and the inner side of the product, and the height of the burr is equal to the difference between the two thicknesses (h=h2-h1). as shown in picture 2.Measurement
The sample for testing the burr height is made from the delivered product, and the recommended sample length is not less than 500mm.
Figure 1 Measurement of roughness (waviness)
8.5 Magnetic properties test
8.5.1 Epstein's Square Measurement
When measuring with a 25cm Epstein square circle, refer to the test method GB/T 3655 (IEC 60404-2, IDT), and a pair of samples should be no less than
Consists of 24 samples. The length direction of the sample should be cut parallel to the rolling direction of the product, and the deviation between the length direction of the sample and the rolling direction of the product
The angle of departure should be within ±1, and the sample should cover the full board width of the product as much as possible. The sampling method, size and allowable deviation of the sample should be
Comply with the provisions of GB/T 3655.
Before testing, the samples shall be subjected to stress relief annealing under the conditions provided by the manufacturer. Test the maximum specific total loss of the aging sample of the product
During the test, the aging sample should be kept at a temperature of 225°C±5°C for 24 hours, and then air-cooled to ambient temperature.
8.5.2 Single-chip method (SST) measurement
When measuring with a single-chip tester, the sampling method, size and allowable deviation of the sample should comply with GB/T 13789 (IEC 60404-3, IDT))
Provisions. In order to ensure the representativeness of the magnetic test results on the magnetic properties of the strip, when cutting a large single-piece sample, the position of the centerline of the sample along the longitudinal direction and
The deviation of the center position in the width direction of the product should be ≤50mm, and the deviation angle between the longitudinal direction of the sample and the rolling direction of the sample should be within ±1.
Specimens measured by the monolithic method do not require stress-relief annealing, nor are aging tests permitted.
8.6 Sampling quantity, sample direction, sample size and test method
8.6.1 The sampling quantity, sample direction, sample size and test method of product inspection items shall comply with the provisions in Table 11.
8.6.2 Tensile test should follow method B of GB/T 228.1.In order to improve the reproducibility of the measurement results, the beam displacement control method is recommended.
method, the yield strength rate is 5% Lc/min, and the tensile strength rate is 40% Lc/min (Lc is the parallel length of the sample). Sample position
The distance from the edge should not be less than 50mm.
8.7 Others
The supplier may use different inspection and test methods for acceptance testing. In the event of a dispute, the inspection and test procedures specified in these technical conditions shall be adopted.
Test methods and related technical requirements.
9 Judgment and re-inspection rules
The product judgment and re-inspection rules shall comply with the provisions of GB/T 17505.
If a certain test result does not meet the standard requirements, double the number of samples will be randomly selected from the same batch to test the unqualified item.
recheck. If the re-inspection results (including all the indicators required by the project test) are qualified, the whole batch is qualified. Re-inspection results (including the project laboratory
All indicators required) Even if one indicator is unqualified, the re-inspection fails. If the retest is unqualified, the test has been done and the test result is unqualified
The individual pieces cannot be accepted, but the untested individual pieces in this batch of materials can be resubmitted for testing and acceptance one by one.
10 Packaging, marking and inspection documents
Product packaging, marking and inspection documents shall comply with Q/BQB 400 regulations. If there is no special requirement, steel coils are packed horizontally, see
The packaging type in Figure 7 in Q/BQB 400, if the purchaser has special requirements for packaging, it can be negotiated when ordering and noted in the contract.
The basic printing items of the quality certificate of oriented electrical steel products include P1.7/50, P1.7/60, J800, and stacking factor. If the buyer has special requirements, it can be
Negotiate when ordering and indicate in the contract.
11 Numerical rounding off rules
The rounding off rules for numerical values shall comply with the provisions of GB/T 8170.
12 Other instructions
Affected by external environment, storage conditions, packaging and other factors, there is a risk of product surface corrosion in the long-term storage of grain-oriented electrical steel. exist
Under normal packaging, transportation, loading and unloading and storage conditions, the supplier shall guarantee that no rust occurs on the surface of the product within 12 months from the date of completion of manufacture.
eclipse.
......
Q/BQB 485-2020
Replace Q/BQB 485-2018
Full-process cold-rolled oriented electrical steel strip
Cold-rolled grain-oriented electrical steel strip delivered in the
fully processed state
2020-11-20 release
2020-12-15 Implementation
release
Preface
This standard is in accordance with GB/T 1.1-2009 "Guidelines for Standardization Work Part 1.Standard Structure and Compilation".
Then drafted.
This standard is compiled with reference to GB/T 2521.2-2016, JIS C2553.2012, IEC 60404-8-7.2008.
This standard replaces Q/BQB 485-2018.
Compared with Q/BQB 485-2018, the main amendments of this standard are as follows.
-Modified the minimum magnetic polarization of some grades;
-Modified the minimum stacking factor, burr height, insulation coating adhesion and surface insulation resistance requirements.
This standard was proposed by the Manufacturing Management Department and Silicon Steel Business Department of Baoshan Iron and Steel Co., Ltd.
This standard was jointly drafted by Baoshan Iron and Steel Co., Ltd. Manufacturing Management Department and Silicon Steel Business Department.
Drafters of this standard. Huang Wangya, Hu Ling, Shen Kanyi, Tu Shulin, Hu Zhuochao, Yang Yongjie.
This standard was first issued in.2007, revised for the first time in.2014, revised for the second time in.2016, and revised for the third time in.2018.
This is the fourth revision.
Full-process cold-rolled oriented electrical steel strip
1 Scope
This standard specifies the nominal thickness of 0.18mm, 0.20mm, 0.23mm, 0.27mm, 0.30mm and 0.35mm
Terms and definitions, classification and code, general requirements, technical requirements, inspection and testing of full-process cold-rolled oriented electrical steel strip
Packaging, marking and inspection documents and other requirements.
This standard is applicable to all-process cold-rolled oriented electrical appliances produced by Baoshan Iron and Steel Co., Ltd. delivered in the final annealed state.
Industrial steel belt (hereinafter referred to as steel belt).
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version
This applies to this document. For undated references, the latest version (including all amendments) applies to this document.
GB/T 228.1 Tensile Test of Metallic Materials Part 1.Room Temperature Test Method
GB/T 2521.2-2016 Full-process cold-rolled electrical steel Part 2.Grain-oriented steel strip (sheet)
GB/T 2522 Electrical steel sheet (belt) surface insulation resistance, coating adhesion test method
GB/T 2900.60 Electrotechnical terminology electromagnetics
GB/T 3655 Method for measuring the magnetic properties of electrical steel sheets (bands) with Epstein square circles
GB/T 4340.1 Vickers hardness test of metallic materials Part 1.Test method
GB/T 8170 Numerical rounding rules and the expression and determination of limit values
GB/T 9637 Electrotechnical terminology, magnetic materials and components
GB/T 13789 Measuring method of magnetic properties of electrical steel sheet (belt) with monolithic tester
GB/T 19289 Electrical steel sheet (strip) density, resistivity and stacking coefficient measurement method
YB/T 4292
Q/BQB 400
Electrical steel strip (sheet) geometric characteristics test method
Packaging, marking and inspection documents for cold rolled products
IEC /TR 62581-2010 Methods of measurement of the magnetostriction characteristics
by means of single sheet and Epstein test specimens
3 Terms and definitions
GB/T 2521.2-2016, GB/T 2900.60, GB/T 9637 and YB/T 4292 and the following terms are applicable
In this document.
3.1 specific total loss (iron loss)
The specific total loss means that the magnetic polarization intensity changes sinusoidally, and when its peak value and frequency are at a specific value, the material absorbed per unit mass
The total power received, the total loss is represented by the symbol P (Jm/f), and the unit is W/kg (or W/lb).
Example. P1.7/50 indicates the ratio of the sample in kg (or lb) measured at a magnetic polarization intensity of 1.7T and a frequency of 50Hz
Total loss
P1.7/60 represents the ratio of the unit kg (or lb) sample measured at the magnetic polarization intensity at 1.7T and the frequency at 60Hz
Total loss.
3.2 Magnetic polarization (magnetic induction)
The magnetic polarization intensity refers to the peak magnetic polarization intensity of a specific magnetic field intensity peak when the sample is magnetized by an alternating magnetic field, which is
The number is J (H), and the unit is T (Tesla).
Example. J800 represents the magnetic polarization intensity corresponding to the magnetic field intensity H of 800A/m (indicated by the peak value).
3.3 A-weighted magnetostriction velocity level, LVA
When the magnetic polarization intensity changes according to the sine law with time, its peak value is a certain calibration value, and the changing frequency is a certain calibration frequency
At the rate, the surface vibration sound pressure level caused by the magnetostriction of the unit length of the electrical steel sheet (strip) along the magnetization direction is A
Weighted magnetostrictive speed level.
3.4 edge camber(straightness)
Refers to the maximum distance between the side edge and the line connecting the two ends of the measuring part. (quoted from YB/T 4292-2012)
3.5 flatness (wave factor) flatness (wave factor)
The ups and downs of the surface of the steel plate or steel strip, that is, the measurement of unevenness, which uses the ratio of the height h of the maximum wave (full wave) to the wavelength l
Expressed as a percentage. (quoted from YB/T 4292-2012)
3.6 number of bends
The maximum repeated bending before the first crack (or the sound of cracking is heard) is visually observed on the substrate with the naked eye
Times. (quoted from GB/T 2521.2-2016)
3.7 Nominal thickness tolerance
The allowable deviation of the nominal thickness in the same acceptance batch. (quoted from GB/T 2521.2-2016)
3.8 Longitudinal thickness tolerance
The thickness deviation on a steel sheet or a certain length of steel strip parallel to the rolling direction. (quoted from GB/T 2521.2-2016)
3.9 transverse thickness tolerance
The deviation of the thickness perpendicular to the rolling direction. (quoted from GB/T 2521.2-2016)
3.10 burr height
The difference in thickness between the shearing edge of the steel strip (sheet) and the thickness measured 10mm away from the shearing edge. (quoted from YB/T 4292-2012)
4 Classification and code
4.1 Nomenclature of steel grades
5.2 Edge state
When the edge state is not specified in the order contract, the steel strip is supplied in the trimmed state.
6 General requirements
6.1 Production process
The production process and chemical composition of the steel strip are determined by the supplier.
6.2 Delivery form
6.2.1 The steel strip is supplied in coils, and the coiled steel strip is referred to as steel coil. The weight of the steel coil shall meet the order requirements.
6.2.2 Steel coils are usually delivered in trimmed state. When users have special requirements, they can be delivered in un trimmed state through agreement.
6.2.3 The inner diameter of the steel coil should be in the range of 500mm～520mm, and the recommended inner diameter value is 508mm±5mm.
6.2.4 The steel coil should be continuous and tightly wound by steel strips of the same width, and the sides of the coil should be as straight as possible, and the coil should not collapse under its own weight.
6.2.5 Steel strips may have splices or welds due to the removal of defects. Marks should be made at the splices or welds before the splices or welds.
The rear part should be of the same grade and no more than 2 places, and the length of the steel strip between the welds should not be less than.200 meters.
6.2.6 In addition to the uncoated series products, the steel strip is coated with insulating coating on both sides. When the user has special requirements, it should be in accordance with the order
protocol.
6.3 Delivery status
The steel strip is delivered in the final annealed state, the coated product is coated with an inorganic insulating coating on both sides, and the uncoated series product table
There is no bottom layer and insulating coating on the surface.
6.4 Surface conditions
6.4.1 The surface of the steel belt should be smooth and clean, free of grease, rust, and defects that affect its use.
6.4.2 The surface of the steel strip is allowed to have underlying defects that do not affect the normal use of the material, such as chromatic aberration, dew, bright spots and other defects;
Substrate defects within the allowable range of thickness deviation that do not affect the normal use of the material are allowed, and the lack of insulation coating, such as slight
Scratches, roller marks, stains, small white spots, small bubbles and other defects.
6.4.3 When the steel strip is delivered with welds or defects, blank paper shall be inserted. When necessary, the marking form of the relevant blank paper shall be
The supply and demand parties negotiate and indicate in the contract.
6.5 Shear adaptability
The steel strip should be easy to be cut into the usual shape accurately at any position with a suitable cutting tool.
7 Technical requirements
7.1 Magnetic properties
The magnetic properties of the steel plate should meet the requirements of Table 2, Table 3, Table 4, Table 5 and Table 6, and the ageing samples should also meet these characteristics.
Sex.
The sickle curve of the steel belt is only applicable to the condition of trimmed supply. At any 2m measurement length, the sickle curve of the steel belt should be
Not more than 0.9mm. If the supplier can guarantee, this test is not required.
7.2.7 Burr height
The cutting burr height is only applicable to materials delivered with trimmed edges. The cutting burr height should not be greater than 0.020mm.
7.2.8 Residual curvature
The residual curvature of the steel strip is determined by testing the distance between the bottom edge of the steel sheet and the support plate. The residual curvature of the steel strip should not exceed
5mm. If the supplier can guarantee, the test may not be carried out.
7.3 Technical characteristics
7.3.1 Conventional density
The agreed density used to calculate the magnetic properties and stacking coefficient of steel is 7.65 kg/dm3.
7.3.2 Stacking factor
The stacking factor of the steel strip should meet the requirements of Table 2, Table 3, Table 4, Table 5 and Table 6, respectively.
7.3.3 Number of bends
The number of bending of the steel strip should not be less than 1 time. If the supplier can guarantee, the test may not be carried out.
7.3.4 Internal stress
Steel belts should avoid internal stress as much as possible. The inspection of internal stress is not applicable to steel belts with a width less than or equal to 500mm.
(The steel strip after slitting and slitting). The measured value of the gap should not exceed 1mm. If the supplier can guarantee, the test may not be carried out.
7.3.5 Mechanical properties
Mainly include tensile strength, yield strength, elongation, Vickers hardness (HV1), etc. If the buyer has requirements for the above properties
2.It should be negotiated when ordering and specified in the contract.
7.3.6 Insulation coating
7.3.6.1 Surface insulation coating state
7.3.6.1.1 Except for the uncoated series products, steel strips are usually delivered in the state of coating with insulating coating on both sides.
7.3.6.1.2 Products coated with insulating coating are attached with a magnesium silicate bottom layer (also called glass film bottom layer), on the bottom layer
The surface is then coated with an inorganic insulating coating. The insulating coating should be able to withstand the corrosion of insulating paint, transformer oil, machine oil and other media.
7.3.6.1.3 The uncoated series products have no magnesium silicate bottom layer and insulating coating on the surface, which are suitable for direct rolling of oriented electrical steel
Very thin band.
7.3.6.2 Adhesion of insulating coating
7.3.6.2.1 According to Appendix A (Test and Evaluation Method for Adhesion of Insulation Coating of Oriented Electrical Steel), the table of Oriented Electrical Steel
The adhesion of the top coat is divided into six levels from A to F according to the adhesion from high to low. < =0.23mm Thickness specification product coating adhesion
The performance level should be D level and above, and the coating adhesion level of products with thickness >0.23mm should be E level and above.
7.3.6.2.2 During the heat treatment under the shearing process and the heat treatment conditions specified by the supplier, the coating shall not fall off in a large area.
But on the cutting edge, slight chipping of the coating is allowed.
7.3.6.3 Surface insulation resistance
If the party has requirements for the insulation resistance of the coating, it should be negotiated at the time of order to agree on the minimum surface insulation resistance.
If heat treatment is required, it should be carried out under the conditions specified by the supplier, and it is agreed to test the surface insulation before or after the heat treatment.
Resistance; the detection of surface insulation resistance refers to GB/T 2522, and it can also be negotiated by both parties and tested according to the agreed method, related
Technical requirements should be specified in the contract.
The surface insulation coating resistance is measured in accordance with GB/T 2522, and the average value of 5 measurements on one side should not be less than 30Ω·cm²/
Surface, the single minimum value of 5 measurements on one side should not be less than 5Ω·cm²/surface.
8 Inspection and testing
8.1 Inspection batch
The steel strip shall be inspected and accepted in batches, and each inspection lot shall be made of the same brand, same specification, same heat treatment state, and the same
Insulation coating steel strip composition. For steel coils with a single coil weight greater than 20 tons, each steel coil constitutes an inspection lot.
8.2 Sampling
8.2.1 Sampling shall be taken from each inspection lot.
8.2.2 The innermost and outermost rings of the steel coil should be regarded as packaging materials, and do not represent the quality of the entire steel coil. The sample should not be cut from this part.
Take. The sample should avoid the welding seam and the joint belt area.
8.2.3 The sampling position is not less than 3m away from the head and tail ends of the steel strip, and the distance is not less than 15mm from the edge of the steel strip. For large monolithic magnetic measurement,
For inspection items with special sampling requirements such as the adhesion of insulating coatings, sampling shall be carried out according to the corresponding sampling rules.
8.3 Surface appearance inspection
The surface appearance quality of the steel strip is inspected with the naked eye.
8.4 Measurement of size and shape
8.4.1 The size and shape of the steel belt
Appropriate measuring tools should be used to measure. The measuring position is not less than 3m from the end of the steel belt.
8.4.2 Thickness measurement
The thickness of the trimmed steel strip should be measured at any position not less than 15mm from the edge. The micrometer precision used for measurement
The degree should be 0.001mm.
8.4.3 Measurement of unevenness (waviness)
Measure the height (h) and wavelength (l) of the maximum wave of the steel strip, and calculate the unevenness of the steel strip (h/l)×100%, as shown in Figure 1.
Shown.
8.4.4 Measurement of glitch (h)
Measure the thickness h2 and h1 at the shear and inner side of the steel strip, and the burr height is equal to the difference between the thickness of the two (h=h2-h1), as shown in Figure 2.
Shown.
8.5 Magnetic performance test
8.5.1 Laser-scored magnetic domain refinement products are tested using the GB/T 13789 monolithic test method, and other series of products should be tested in accordance with the GB/T 13789 monolithic test method.
GB/T 3655 Epstein square circle test method test.
8.5.2 The results of the same steel strip according to the two methods of GB/T 3655 and GB/T 13789 will be different, in order to ensure that different materials
Using different methods to test the comparability of the test results under the conditions, the specific total loss tested by the single-chip test method, the specific apparent power
Convert the test data to Epstein’s square circle method according to Appendix B. Test the magnetic characteristics according to the Epstein square circle method specified in GB/T 3655
The sample should be subjected to stress relief annealing. The annealing temperature should be 800℃±20℃, the annealing time should be 2h, and the annealing time should be 2h.
It is then cooled in the furnace. When the magnetic properties are tested according to the single-piece method specified in GB/T 13789, the sample is not subjected to stress relief annealing.
8.5.3 When testing the specific total loss of the aged sample, the aged sample should be kept at a temperature of 225℃±5℃ for 24h, but
After air cooling to ambient temperature.
8.6 The number of samples, the direction of the sample, the size of the sample and the test method
8.6.1 The sampling quantity, sample direction, sample size and test method of steel strip inspection items shall meet the requirements of Table 9.
8.6.2 The tensile test shall be in accordance with GB/T 228.1 Method B. In order to improve the reproducibility of the measurement results, it is recommended to use the beam position
Shift control method, the yield strength rate is 5%Lc/min, and the tensile strength rate is 40%Lc/min (Lc is the flatness of the sample).
(Line length). The distance between the sample position and the edge should not be less than 50mm.
8.7 Reinspection
If there is a test result that does not meet the requirements of the standard, double the number of samples from the same batch shall be taken for the test.
Re-inspection of qualified projects. The re-inspection results (including all the indicators required by the project test) are qualified, and the entire batch is qualified. Re-inspection is completed.
If (including all the indicators required by the project test), even if one indicator fails, the re-inspection fails. If the re-inspection fails
Qualified, the unit that has been tested and the test result is inconsistent cannot be accepted, but the unit of the batch of materials that has not been tested can be weighted one by one
New submission test and acceptance.
8.8 Other
The supplier can use different inspection and test methods for acceptance testing. In case of disputes, the standards specified in this standard shall be used.
Inspection and test methods and related technical requirements are tested.
9 Packaging, marking and inspection documents
The packaging, marking and inspection documents of the steel strip should meet the requirements of Q/BQB 400.If there is no special requirement, the steel coil shall be horizontal
For packaging, please refer to Q/BQB 400 in Figure 7 for packaging types. If the party has special requirements for packaging, it can be negotiated at the time of ordering.
Indicated in the contract.
The quality certificate of grain-oriented electrical steel products usually print items with P1.7/50, P1.7/60, J800, stacking factor, only if necessary
Special requirements can be negotiated when ordering and indicated in the contract.
10 Numerical rounding rules
The value rounding rules should meet the requirements of GB/T 8170.
11 Standard other instructions
Affected by external environment, storage conditions, packaging and other factors, there will be rust on the surface of the steel strip under long-term storage of oriented electrical steel
Corrosion risk. Under the usual packaging, transportation, loading and unloading and storage conditions, the supplier should guarantee 12 months from the date of completion of manufacturing
Inside, there is no corrosion on the surface of the steel strip.
Note. The issuance date in the product inspection document is usually specified as the product's manufacturing completion date.
12 See Appendix C for the approximate comparison between the grades of this standard and the grades of domestic and foreign technical specifications.
13 For the technical differences between this standard and the national standard GB/T 2521.2-2016, see Appendix D.
Appendix B
(Normative appendix)
Description of the magnetic performance sampling and test data conversion of laser-scored magnetic domain refinement products in this standard
B.1 The laser scoring technology of oriented electrical steel utilizes the characteristics of rapid heating and cooling of laser processing.
The surface is scored to promote small plastic deformation and high-density dislocations in the heating zone, reduce the length of the main domain wall, and produce residuals at the same time
The residual tensile stress achieves the purpose of refining the magnetic domain and reducing the total loss. Therefore, the oriented electrical steel after laser scoring treatment,
It has a lower specific total loss than before the notch, which can effectively reduce the energy loss during the operation of the transformer.
B.2 In general, when the magnetic properties of oriented electrical steel are tested, in order to eliminate the influence of sample shear stress on the test results
It needs to go through stress relief annealing treatment (annealing temperature is about 780～850℃). For laser scoring products, eliminate
Stress annealing will greatly weaken the influence of laser scoring on magnetic domain refinement, and even completely eliminate laser scoring and reduce the ratio of total loss.
As a result, the performance of the product is degraded to a level close to the level before the scoring. For this reason, laser scoring products are undergoing magnetic performance testing
At this time, large monolithic samples are often used without stress relief annealing treatment to avoid the influence of stress relief annealing on the scoring effect.
B.3 The magnetic performance test of Baosteel's laser scoring magnetic domain refinement product adopts a monolithic tester for testing.
Xiangdian Steel only tests the level of magnetic properties parallel to the rolling direction. In special circumstances, it can be agreed to test parallel to the rolling direction separately.
And the magnetic properties perpendicular to the rolling direction. The specific test method complies with GB/T 13789-2008 (IEC 60404-3.2002, IDT)
According to relevant regulations, the nominal size of the test sample is 500mm×500mm, and the error of the test sample length is within ±0.1%.
The quality error of the test sample is within ±0.1%. In order to ensure that the magnetic test results are representative of the magnetic properties of the strip steel, a large single piece is cut
When testing the sample, the deviation between the center position of the sample and the center position in the width direction of the strip is controlled to be ≤50mm, and the edge of the sample is away from the sample plate
The edge is controlled at ≥100mm, and the deviation angle between the longitudinal direction of the sample and the rolling direction of the sample plate is ≤1.0°, as shown in Figure B.1.
It is required to cut neatly, flat, good right-angle, clean surface, no defects that affect performance test, and no cutting is allowed on the edge of the sample
After polishing, the height of the shear burr should not be higher than 20μm. Large single-piece specimens are tested directly without stress relief annealing treatment.
B.4 According to GB/T 13789-2008 (IEC 60404-3..2002, IDT) Appendix C, oriented electrical steel Aibos
The flat circle method and the monolithic method test the specific total loss and specific apparent power through a factor δP (specific total loss P) and δ
HS (Magnetic Field Strength H and Specific Apparent Power S), the results of the monolithic method PS, SST, HS, SST and SS, SST can be expressed through the relation (GB/T
13789-2008, C.2a, C.2b and C.2c) PS, EPS, HS, EPS and SS, EPS conversion results to Epstein’s square circle method, two
The fitting relationship of the difference in the results obtained by the detection method can refer to the relationship C.3a and C.3b listed in Appendix C of GB/T 13789-2008.
In the formula, the effective interval of fitting is 1.0T～1.8T, and the conversion relationship is only applicable to laser scoring of thickness specifications of 0.23mm...
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| Standard ID | Q/BQB 485-2023 (Q/BQB485-2023) | | Description (Translated English) | Cold-rolled grain-oriented electrical steel strip delivered in the fully processed state | | Sector / Industry | Chinese Industry Standard | | Classification of Chinese Standard | QBQ | | Word Count Estimation | 28,276 | | Date of Issue | 2023-04-09 | | Date of Implementation | 2023-07-01 | | Standard ID | Q/BQB 485-2021 (Q/BQB485-2021) | | Description (Translated English) | Cold-rolled grain-oriented electrical steel strip delivered in the fully processed state | | Sector / Industry | Chinese Industry Standard | | Classification of Chinese Standard | QBQ | | Word Count Estimation | 30,368 | | Date of Issue | 28/4/2021 | | Date of Implementation | 1/7/2021 | | Older Standard (superseded by this standard) | Q/BQB 485-2020 | | Issuing agency(ies) | Baoshan Iron and Steel Co., Ltd. | | Standard ID | Q/BQB 485-2020 (Q/BQB485-2020) | | Description (Translated English) | Cold-rolled grain-oriented electrical steel strip delivered in the fully processed state | | Sector / Industry | Chinese Industry Standard | | Classification of Chinese Standard | QBQ | | Word Count Estimation | 22,221 |
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