Q/BQB 481-2023_English: PDF (Q/BQB481-2023)
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Cold-rolled fully processed non-oriented electrical steel strip for use at medium frequencies
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Q/BQB 481-2023
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| Q/BQB 481-2021 | English | 809 |
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Cold-rolled Fully processed non-oriented electrical steel strip for use at medium Frequencies
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Q/BQB 481-2021
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| Q/BQB 481-2018 | English | 130 |
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Full Process Cold Rolled Medium Frequency Non-Oriented Electrical Steel Strip
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Q/BQB 481-2018
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| Q/BQB 481-2009 | English | 159 |
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Semi-cold-rolled non-oriented electrical steel strip
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Q/BQB 481-2009
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| Standard ID | Q/BQB 481-2023 (Q/BQB481-2023) | | Description (Translated English) | Cold-rolled fully processed non-oriented electrical steel strip for use at medium frequencies | | Sector / Industry | Chinese Industry Standard | | Classification of Chinese Standard | QBQ | | Word Count Estimation | 23,284 | | Date of Issue | 2023-04-09 | | Date of Implementation | 2023-07-01 | | Standard ID | Q/BQB 481-2021 (Q/BQB481-2021) | | Description (Translated English) | Cold-rolled Fully processed non-oriented electrical steel strip for use at medium Frequencies | | Sector / Industry | Chinese Industry Standard | | Classification of Chinese Standard | QBQ | | Word Count Estimation | 23,298 | | Date of Issue | 28/4/2021 | | Date of Implementation | 1/7/2021 | | Older Standard (superseded by this standard) | Q/BQB 481-2018 | | Issuing agency(ies) | Baoshan Iron and Steel Co., Ltd. | | Standard ID | Q/BQB 481-2018 (Q/BQB481-2018) | | Description (Translated English) | Full Process Cold Rolled Medium Frequency Non-Oriented Electrical Steel Strip | | Sector / Industry | Chinese Industry Standard | | Classification of Chinese Standard | QBQ | | Word Count Estimation | 5,518 | | Administrative Organization | Baoshan Iron and Steel Co., Ltd. |
Q/BQB 481-2021 English name.Cold-rolled Fully processed non-oriented electrical steel strip for use at medium Frequencies
Q/BQB 481-2021
Replaces Q/BQB 481-2018
Full-process cold-rolled intermediate frequency non-oriented electrical steel strip
release
1 Scope
This document stipulates that the nominal thickness is 0.15mm, 0.20mm, 0.25mm, 0.27mm, 0.30mm and 0.35mm
Terms and definitions, classifications and codes, general requirements, technical requirements, inspection and testing, packaging, marking and inspection documents of grain-oriented electrical steel strip
Wait for the request.
This document is applicable to final annealing products produced by Baoshan Iron and Steel Co.
Full-process cold-rolled non-oriented electrical steel strip products (hereinafter referred to as products) delivered in state.
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 228.1-2010 Tensile test of metallic materials Part 1.Experiment method at room temperature
GB/T 2521.1 Full-process cold-rolled electrical steel Part 1.Grain-free oriented steel strip (sheet)
GB/T 2522
GB/T 2791
Test method for surface insulation resistance and coating adhesion of electrical steel sheet (strip)
Adhesive T-peel strength test method flexible material to flexible material
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 for metallic materials - Part 1.Test method
GB/T 8170 Numerical rounding off rules and expression and determination of limit values
GB/T9637
GB/T10129
Electrotechnical Terminology Magnetic Materials and Components
Measurement method of medium frequency magnetic properties of electrical steel sheet (strip)
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 400-2020 Packaging, marking and inspection documents of cold-rolled products
IEC 60404-8-8 Specifications for individual materials-Thin electrical
steel strip and sheet for use at medium frequencies
3 Terms and Definitions
4 categories
The grade of materials in this document is based on the maximum specific total loss value P1.0/400 at a magnetic polarization of 1.0T and a frequency of 400Hz, and the nominal value of the material
Grades are classified by thickness, and subdivided into five types according to product characteristics. ordinary type, high-efficiency type, high-efficiency high-strength type, high magnetic induction type and high-strength 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 Classification and code of insulating coating
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
6.2.1 Products are supplied in coils, referred to as steel coils. The weight of the steel coil should meet the order requirements, the coil weight is generally 3 to 10 tons, and the special coil weight should be ordered
Negotiate at the time of shipment and indicate in the contract.
6.2.2 Steel coils are delivered in trimmed state.
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 508mm.
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.
6.3 Delivery status
The steel strip is delivered final annealed and coated with an insulating coating on both sides.
6.4 Surface conditions
6.4.1 The surface of the steel strip should be smooth and clean, free from grease, rust, and defects that affect its use.
6.4.2 The surface of the steel strip is allowed to have substrate flaws and insulating coating flaws within the allowable range of thickness deviation that do not affect the normal use of the material.
Defects such as minor scratches, color difference, roll printing, and markings.
6.5 Shear adaptability
The steel strip should be easily cut or stamped to ensure that the steel strip is cut into the usual shape at any position.
7 Technical Requirements
7.1 Magnetic properties
The magnetic properties of the products provided under the conditions of 6.3 shall comply with the provisions in Table 3.The requirements for magnetic properties after aging shall be determined by both the supplier and the buyer when ordering
Negotiate and specify in the contract.
7.2 Mechanical properties
The mechanical properties of the high-efficiency high-strength type and high-strength type II products provided under the conditions of 6.3 shall meet the requirements in Table 4.For demand side
If there are requirements for the mechanical properties of other types of products, they should be negotiated when ordering and indicated in the contract.
7.3 Properties of insulating coatings
7.3.1 Condition of insulating coating
Products are usually delivered with insulating coatings on both sides, the types of coatings are shown in Table 2.The insulating coating should be resistant to insulating varnish, transformer oil,
Corrosion of medium such as mechanical oil. The approximate comparison between the insulating coating specified in this document and the insulating coating specified in relevant domestic and foreign technical specifications can be found in the appendix
Record A (informative appendix), the characteristics of the insulating coating see Appendix B (informative appendix).
If there are special requirements such as the thickness of the insulating coating and the peel strength of the self-adhesive coating, it should be negotiated when ordering and noted in the contract.
bright.
7.3.2 Insulation coating adhesion
According to Appendix C (Methods for Testing and Rating Adhesion of Insulating Coating on Non-oriented Electrical Steel), the adhesion of the insulating coating of the product is determined by high
The lowest is divided into four levels. A, B, C, and D. As supplied, the product shall be coated with an adhesion class of at least C.
During the shearing process and heat treatment under the heat treatment conditions specified by the supplier, the coating shall not fall off in a large area, but at the shearing edge
Slight chipping of the coating is allowed.
7.3.3 Coating insulation resistance
Coating insulation resistance is divided into surface insulation resistance and interlayer resistance. The unit of surface insulation resistance is Ω cm2/surface, and the unit of interlayer resistance is
Ω·cm2/sheet, theoretically, the interlayer resistance is twice the surface insulation resistance. According to the requirements of the buyer, after negotiation between the supplier and the buyer, coating can be carried out
Insulation resistance testing, and specify the minimum value of coating surface insulation resistance or interlayer resistance in the contract.
7.4 Geometric properties and tolerances
7.4.1 Thickness
7.4.1.1 Nominal thickness
The nominal thickness of the product is 0.15mm, 0.20mm, 0.25mm, 0.27mm, 0.30mm and 0.35mm in six thickness specifications.
7.4.1.2 Thickness tolerance
Thickness tolerances include the following three categories, including.
- The allowable deviation of the nominal thickness within the same acceptance batch, hereinafter referred to as the allowable deviation of the nominal thickness;
- within a certain length (2000mm±200mm) parallel to the rolling direction (that is, the length direction of the steel strip), at each point in the longitudinal direction of the steel strip
The deviation between the actual thicknesses, hereinafter referred to as the longitudinal thickness difference;
- Perpendicular to the rolling direction (that is, along the width direction of the steel strip), the distance from the edge of the steel strip is not less than 15mm and the middle position of the transverse width, each
The deviation between the actual thicknesses of the dots, hereinafter referred to as the lateral thickness difference.
The nominal thickness tolerance, longitudinal thickness deviation, and transverse thickness deviation of the product shall comply with the provisions in Table 5.
7.4.2.1 Width range
The width of the steel belt can be selected within the width range specified by the supplier, and the width range of the steel belt should meet the requirements in Table 6.
7.4.2.2 Width tolerance
The steel strip is delivered in trimmed state, and the allowable deviation of the width of the steel strip shall comply with the provisions in Table 7.
7.4.3 Roughness
The unevenness (wavyness) of the steel strip should not be greater than 1.5%, and the wave height of the steel strip should not be greater than 3.0mm.
7.4.4 Sickle
The camber provisions for steel strips only apply to the trimmed delivery state. On any measured length of 2m, the camber of the strip shall not be greater than 2mm.
If the supplier can guarantee it, it is not necessary to carry out this test.
7.4.5 Burr height
The specified shear burr height applies only to materials delivered trimmed. The shearing burr height should not be greater than 0.035mm.
7.4.6 Residual curvature
The residual curvature of the strip is determined by the distance between the bottom edge of the test strip and the support plate. The residual curvature of the strip shall not exceed 35mm. for
If it can be guaranteed, the test may not be carried out.
7.5 Technical characteristics
7.5.1 Agreed Density
The agreed density used to calculate the magnetic properties and stacking factor of the product shall comply with the provisions in Table 3.If other agreed densities are required, supply and demand are required
To be determined after negotiation between the two parties.
7.5.2 Stacking factor
The stacking factor of the product shall comply with the provisions in Table 3.In the case of arbitration, it applies to the state without insulating coating.
7.5.3 Bending times
The number of bending times refers to the time before the first crack that penetrates the thickness of the sample (or the sound of a crack is heard) is observed on the substrate with the naked eye.
The maximum number of repeated bending times, which indicates the ductility of the material. The number of bending times shall comply with the provisions in Table 3.If the supplier can guarantee, it is not necessary to carry out the
test.
8 Inspection and testing
8.1 Inspection lot
Steel strips shall be inspected and accepted in batches, and each inspection batch shall consist of not more than 20 tons of steel strips of the same brand, specification, heat treatment state, and insulation coating.
band composition. For steel strips weighing more than 20 tons, each 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 steel coils 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.
8.2.3 The sampling position shall be no less than 3m from both ends of the steel strip, and not less than 15mm from the edge of the steel strip.
8.2.4 By properly arranging the test sequence, the same sub-specimen can be used to test multiple characteristics.
8.3 Surface visual inspection of steel strip
The surface appearance quality of the strip is inspected visually.
8.4 Measurement of size and shape
The size and shape of the steel strip shall be measured with appropriate measuring tools. The size and shape of the steel strip should be no less than 3m away from both ends of the steel strip.
measured at the position.
8.4.1 Measurement of thickness
The thickness of the strip should be measured at any position not less than 15mm from the edge. The accuracy of the micrometer used for measurement should be 0.001mm.
8.4.2 Measurement of roughness (waviness)
Measure the height (h) and wavelength (l) of the maximum wave of the steel strip, and calculate the roughness of the steel strip (h/l)×100%, as shown in Figure 1.
8.4.3 Measurement of glitch (h)
Measure the thickness h2 and h1 of the strip shear and the inner side, and the height of the burr is equal to the difference between the two thicknesses (h=h2-h1). as shown in picture 2.
Test specimens for burr height are taken from the finished delivery strip.
8.5 Magnetic properties test
The magnetic performance shall be tested according to GB/T 3655.For coated products, the weight of the insulating coating shall be taken into account. Test product aging
When the specific loss of the sample is reached, the aging sample should be kept at a temperature of 225°C±5°C for 24 hours, and then air-cooled to room temperature.
8.6 Tensile test
The tensile test should be carried out in accordance with method B of GB/T 228.1-2010.In order to improve the reproducibility of the measurement results, it is recommended to use the beam displacement control
The method is used to measure the yield strength at a rate of 0.00083 s-1 (5% Lc/min, Lc is the parallel length of the sample), and the rate after yield is 0.0067 s-1
(40% Lc/min). The distance between the sample position and the edge should not be less than 50m..
8.7 Sampling quantity, sample direction, sample size and test method
The sampling quantity, sample direction, sample size and test method of product inspection items shall comply with the provisions in Table 8.
8.8 Others
The supplier may use different inspection and test methods for acceptance testing, and in case of disputes, the inspection and test methods specified in this document shall be adopted
Law and related technical requirements for testing.
9 Judgment and re-inspection rules
The product judgment and re-inspection rules shall comply with the provisions of GB/T 17505.
Among the specified magnetic properties and process performance inspection items, if any test result does not meet the requirements of this document, it will be re-submitted from the same batch.
Take double the number of samples for re-inspection of the unqualified item. If the re-inspection results (including all the indicators required by the project test) are qualified, the whole
batch qualified. The retest results (including all the indicators required by the project test) even if one indicator is unqualified, the retest is unqualified. such as retest
If it is unqualified, the unit that has been tested and the test result is unsatisfactory cannot be accepted, but the unit that has not been tested in this batch of materials can be resubmitted for testing one by one.
Inspection and acceptance.
10 Packaging, marking and inspection documents
The packaging, marking and inspection documents of the steel strip shall comply with the regulations of Q/BQB 400.If there is no special requirement, steel coils are packed horizontally, see
The packaging type in Figure 7 in Q/BQB 400-2020, if the buyer has special requirements for packaging, it can be negotiated when ordering and noted in the contract.
The quality certificate of non-oriented electrical steel products usually includes P1.0/400 and J5000/50.If the buyer has special requirements, it can be consulted when ordering.
business.
11 Numerical rounding off rules
The rounding off rules for numerical values shall comply with the provisions of GB/T 8170.
12 Information required for ordering
When ordering, users need to provide the following information.
-- product name (steel strip);
--The file number of the enterprise;
-- grade;
-- coating type;
--Standard sizes;
-- edge state;
--weight;
--Packing;
--use;
--Other special requirements.
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Q/BQB 481-2018
BQB
ENTERPRISE STANDARD OF BAOSTEEL
Full Process Cold Rolled Medium
Frequency Non-Oriented Electrical Steel Strip
Issued on. February 02, 2018
Issued by. Baoshan Iron & Steel Co., Ltd.
Table of Contents
Self-Commitment ... 3
Technical Indicator 1 ... 4
Document for Indicator Requirements of Technical Indicator 1 ... 5
Self-Commitment
The contents specified in Q/BQB 481-2018 Full Process Cold Rolled Medium
Frequency Non-Oriented Electrical Steel Strip, which is prepared and published by our
company, comply with the requirements of relevant national laws and regulations,
mandatory standards, and relevant industrial policies; are approved to be published by
the legal representative of the enterprise in accordance with the prescribed procedures.
The products produced by our company meet the technical requirements stipulated in
this Standard; the standard number is clearly indicated on the package of
corresponding product. Our company is responsible for the truthfulness, accuracy and
legality of the public information in the self-commitment; assumes full legal
responsibility for the consequences of the implementation of this Standard.
Baoshan Iron & Steel Co., Ltd.
February 02, 2018
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