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Q/BQB 486-2021 English PDF

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Q/BQB 486-2021: Cold-rolled grain-oriented electrical steel strip specialized for UHV transformers (including UHVDC Converter Transformers)

Q/BQB 486: Evolution and historical versions

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
Q/BQB 486-2021	English	799	Add to Cart	4 days [Need to translate]	Cold-rolled grain-oriented electrical steel strip specialized for UHV transformers (including UHVDC Converter Transformers)		Q/BQB 486-2021
Q/BQB 486-2018	English	125	Add to Cart	0--9 seconds. Auto-delivery	Cold Rolled Oriented Electrical Steel Strip for UHV (Including DC Commutation Type) Transformer		Q/BQB 486-2018

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Basic data

Standard ID	Q/BQB 486-2021 (Q/BQB486-2021)
Description (Translated English)	Cold-rolled grain-oriented electrical steel strip specialized for UHV transformers (including UHVDC Converter Transformers)
Sector / Industry	Chinese Industry Standard
Classification of Chinese Standard	QBQ
Word Count Estimation	20,29
Issuing agency(ies)	Baoshan Iron & Steel Co., Ltd.

Q/BQB 486-2021: Cold-rolled grain-oriented electrical steel strip specialized for UHV transformers (including UHVDC Converter Transformers)

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Q/BQB 486-2021 Replaces Q/BQB 486-2018 Cold-rolled orientation for UHV (including DC converter type) transformers Electrical steel strip release

foreword

This document is in accordance with GB/T 1.1-2020 "Guidelines for Standardization Work Part One. Structure and Drafting Rules for Standardization Documents" "Rules" drafted. This document replaces Q/BQB 486-2018. Compared with Q/BQB 486-2018, the main revisions of this document are as follows. - According to the IEC document (IEC 6040-8-7 Edition 5.0 2020-09), the single-chip method (SST) magnetic performance detection data transfer Change the rules to adjust; - Modified the wave height standard for steel strips; - Delete the informative appendix of typical values of technical performance indicators, which is reflected in the product manual. Please note that some contents of this document may refer to patents. The issuing agency of this document assumes no responsibility for identifying patents. This document is proposed by the Silicon Steel Business Department and Manufacturing Management Department of Baoshan Iron & Steel Co., Ltd. This document is jointly drafted by Baoshan Iron & Steel Co., Ltd. Silicon Steel Business Department, Manufacturing Management Department and Wuhan Iron and Steel Co., Ltd. Drafters of this document. Huang Wangya, Chen Zhuolei, Ge Liangqi, Wen Guanghao, Chen Jianbing, Hu Zhuochao, Wang Xiongkui, Tian Wenzhou, Shen Jie, Hu Ling, forward. This document was first published in.2018. Cold-rolled grain-oriented electrical steel strip for UHV (including DC converter type) transformers

1 Scope

This document specifies the cold-rolled grain-oriented electrical steel for 1000KV and above UHV AC transformers, ±800kV and related DC converter transformers The terms and definitions, classification and codes, general requirements, technical requirements, inspection and testing, packaging, marking and inspection documents, etc. This document is applicable to the full-process cold-rolled oriented transformers for UHV (including DC converter type) transformers produced by Baoshan Iron and Steel Co., Ltd. Industrial steel belt (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.

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 according to the product type, it is subdivided into special high magnetic polarization for UHV transformers and special for UHV transformers. There are two types of products with magnetic domain refinement.

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.= 6.2 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 grain-oriented electrical steel for UHV (including DC converter type) transformers provided under the conditions of 6.3 shall comply with Table 3 and Table 4. Provisions, aging samples 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 the high magnetic polarization products in Table 3 and Table 4 should be tested according to GB/T 3655.Before the test, the samples should be Stress relief annealing is carried out under the conditions provided by the manufacturer (usually the range of stress relief annealing temperature is 800°C±20°C, the annealing time is 2h, Cooling with the furnace after annealing); however, the magnetic properties of products produced by the non-heat-resistant magnetic domain refinement method (such as laser scoring) in Table 3 and Table 4 should be in accordance with GB/T For the 13789 test, the specimen does not need to be stress-relieved annealed prior to testing. After consultation between the supplier and the buyer, the magnetic properties of other products in Table 3 and Table 4 Performance can also be tested according to GB/T 13789. 7.1.3 The magnetic polarization J800 obtained from the test under the condition of magnetic field strength H = 800 A/m shall meet the requirements in Table 3.Among them, the same product According to the GB/T 13789 method, the magnetic polarization value J800 is lower than that measured by the GB/T 3655 method. 7.1.4 Under the condition of magnetic polarization of 1.7T and 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 should meet the requirements in Table 3. 7.1.5 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 (IEC 60404-3..2002, IDT). According to the conversion, the fitting relationship of the total loss conversion factor δP obtained by the two detection methods can refer to GB/T 13789-2008 (IEC 60404-3. 2002, IDT) Appendix C relational formula C.3a, in which the effective range of fitting is 1.0T～1.8T, and this conversion relationship is only applicable to 0.23mm and The conversion relationship between the above-mentioned thickness specifications of laser-marked products and the thickness specifications of 0.20mm and below laser-marked products is based on actual testing and application Special provisions are made compared with the experimental results. When the supplier and the user have clear requirements for P1.5/50 and P1.5/60, the converted P1.5/50 and P1.5/60 should meet In line with the provisions of Table 3. 7.1.6 For the specific apparent power values of the same product under the conditions of 50Hz and 60Hz measured according to GB/T 13789 monolithic method, refer to GB/T 13789-2008 Relation C.2c specified in Appendix C is converted to the square circle method data, and the specific apparent power conversion factor δ obtained by the two detection methods For the fitting relationship of HS, please refer to the relational formula C.3b in Appendix C of GB/T 13789-2008. The conversion relationship is only applicable to laser-marked products with a thickness of 0.23mm and above, and the conversion of laser-marked products with a thickness of 0.20mm and below The relationship is specified according to the results of actual testing and application comparison experiments. When there is a clear requirement for Ss1.7/50 through negotiation between the supplier and the user, turn to The replaced Ss1.7/50 should meet the requirements in Table 3. 7.1.7 Under other test conditions, the conversion factor Fc can be determined through negotiation between the supplier and the user. 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. 7.2 Coating properties According to the requirements of the buyer, after negotiation between the supplier and the buyer, the coating characteristic test can be carried out, and the guarantee value of the coating characteristic should be indicated in the contract. If the product If heat treatment is required, it shall be carried out according to the conditions specified by the manufacturer, and it shall be stated in the contract that the coating properties shall be tested before or after heat treatment. The insulating coating should be resistant to erosion by insulating varnish, transformer oil, mechanical oil and other media. 7.2.1 Coating adhesion The coating adhesion level of the product with a thickness of < =0.23mm should be grade C and above, and the coating adhesion level of the product with a thickness of >0.23mm Should not be grade D and above. 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 on the sheared edge, Slight chipping of the coating is allowed. 7.2.2 Coating insulation resistance The testing of coating insulation resistance shall be carried out with reference to GB/T 2522, or both parties may negotiate and test according to the agreed method. Related technologies Requirements should be stated in the contract. The surface insulation coating resistance measured in accordance with GB/T 2522, the average value of 5 measurements on one side should not be less than 30Ω·cm²/side, single side The single minimum value of 5 measurements shall not be less than 15Ω·cm²/surface. If the supplier can guarantee it, the test may not be carried out. Note. Coating insulation resistance is divided into surface insulation resistance and interlayer resistance. In theory, interlayer resistance is twice the surface insulation resistance. Q/BQB 486-2018 7.3 Geometric properties and tolerances 7.3.1 Thickness The nominal thickness of the product is 0.23mm, 0.27mm, 0.30m. Thickness tolerances include the following three categories, including. - The allowable deviation of the nominal thickness within the same acceptance batch, referred to as the allowable deviation of the nominal thickness; - within a certain length (2000mm ±.200mm) parallel to the rolling direction (ie, the product length direction), at each point in the longitudinal direction of the product The deviation between the actual thicknesses, hereinafter referred to as the longitudinal thickness deviation; - perpendicular to the rolling direction (that is, along the width direction of the product), the distance from the top of the product to the edge is not less than 15mm and the middle position of the transverse width, The deviation between the actual thickness of each point, hereinafter referred to as the lateral thickness deviation. 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. 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 Q/BQB 486-2018 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. 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 entire board width of the product as much as possible. The sampling method, size and allowable deviation of the sample shall comply with 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 Figure 2 Measurement chart of burr height (h) Figure 1 Measurement of roughness (waviness) 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. The sample measured by the single-piece method is a rolled state sample, which does not require stress relief annealing treatment, and aging treatment is not allowed. 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 7. 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 methods and related technical requirements for testing.

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