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GB/T 2521.2-2025 English PDF

GB/T 2521.2: Historical versions

Standard IDUSDBUY PDFLead-DaysStandard Title (Description)Status
GB/T 2521.2-2025RFQ ASK 3 days Cold-rolled electrical steel delivered in the fully-processed state - Part 2: Grain-oriented steel strip(sheet) Valid
GB/T 2521.2-2016150 Add to Cart Auto, < 3 mins Cold-rolled electrical steel delivered in the fully-processed state -- Part 2: Grain-oriented steel strip (sheet) Valid


Basic data

Standard ID: GB/T 2521.2-2025 (GB/T2521.2-2025)
Description (Translated English): Cold-rolled electrical steel delivered in the fully-processed state - Part 2: Grain-oriented steel strip(sheet)
Sector / Industry: National Standard (Recommended)
Date of Implementation: 2026-03-01
Older Standard (superseded by this standard): GB/T 2521.2-2016

GB/T 2521.2-2016: Cold-rolled electrical steel delivered in the fully-processed state -- Part 2: Grain-oriented steel strip (sheet)


---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.
Cold-rolled electrical steel delivered in the fully-processed state - Part 2. Grain-oriented steel strip (sheet) ICS 77.140.40 H53 National Standards of People's Republic of China Partially replace GB/T 2521-2008 Full process cold rolled electrical steel Part 2. Grain oriented steel strip (sheet) Part 2. Grain-orientedsteelstrip(sheet) (IEC 60404-8-7.2008, Magneticmaterials-Part 8-7. Specificationsfor Andsheetdeliveredinthefuly-processedstate, MOD) 2016-06-14 released.2017-05-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China China National Standardization Administration issued

Content

Foreword I 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Category 2 5 symbols and grades 2 6 General requirements 3 7 Technical requirements 4 8 Inspection and test 7 9 Judgment and re-examination rules 9 10 Packaging, Marking and Quality Certificate 10 11 Ordering Content 10 Appendix A (Normative Appendix) Repeated Bending Test Method 11 Appendix B (Normative) Test Method for Coating Insulation Resistance 13 Appendix C (informative) Characteristics and main uses of each grade 14 Appendix D (informative appendix) This part and IEC 60404-8-7.2008 brand comparison table 16 Appendix E (informative) This section is numbered in accordance with the IEC 60404-8-7.2008 chapter number. Appendix F (informative) Technical differences and causes of this part and IEC 60404-8-7.2008 19

Foreword

GB/T 2521 "Full Process Cold Rolled Electrical Steel" is divided into the following two parts. --- Part 1. Grain non-oriented steel strip (sheet); --- Part 2. Grain oriented steel strip (sheet). This part is the second part of GB/T 2521. This part is drafted in accordance with the rules given in GB/T 1.1-2009. This part replaces "cold rolled oriented electrical steel strip (sheet)" in GB/T 2521-2008 "Cold-rolled oriented and non-oriented electrical steel strip (sheet)" In part, compared with GB/T 2521-2008, the main technical changes are as follows. --- The standard name is adjusted to "Full Process Cold Rolled Electrical Steel Part 2. Grain Oriented Steel Strip (Sheet)"; --- Removed all the contents of cold rolled non-oriented electrical steel; --- Increased the range of the inner diameter of the coil; --- Increased magnetic domain refinement level 11 grades; canceled 23Q130, 27Q110, 27Q140, 30Q140, 30Q150, 35Q135 A total of 6 brands; ---The steel grades are divided into three categories. ordinary grade, high magnetic polarization level, and magnetic domain refinement level; --- Increased the magnetic polarization of each grade; ---"Magnetic characteristics" was changed to "magnetic properties", "process characteristics" was changed to "technical characteristics"; ---Adjusted steel strip (sheet) thickness tolerance, longitudinal thickness deviation and lateral thickness deviation; --- Increased steel strip (sheet) file bending requirements; --- Increase the requirements and test methods for the deviation of the shear edge caused by internal stress; --- Added Appendix A (normative appendix) repeated bending test method; --- Added Appendix B (normative appendix) test method for coating insulation resistance; --- Added the characteristics and main uses of the various grades in Appendix C (informative); --- Removed Chapter 10 "Objection." This section uses the redrafting method to modify the use of IEC 60404-8-7.2008 "Magnetic Materials Part 8-7. Full Process Cold Rolling Specification for the delivery of electrical steel strips (sheets). This section has more structural adjustments than IEC 60404-8-7.2008. This section is listed in Appendix E. A list of chapter numbers for IEC 60404-8-7.2008. There are technical differences between this part and IEC 60404-8-7.2008. The terms involved in these differences have been passed on the outer side of the page. The vertical single line (|) of the blank position is marked, and a list of the corresponding technical differences and their causes is given in Appendix F. Appendix D gives Correspondence between this part and the IEC 60404-8-7.2008 grade. This part was proposed by the China Iron and Steel Association. This part is under the jurisdiction of the National Steel Standardization Technical Committee (SAC/TC183). This section drafted by. Wuhan Iron and Steel (Group) Company, Metallurgical Industry Information Standards Institute, Xinyu Iron and Steel Co., Ltd., Shougang the company. The main drafters of this section. Liu Concentration, Hu Shoutian, Zhang Weixu, Zhao Heming, Si Liangying, Mao Yuhui, Yan Yan, Yu Xiaoqin, Qiang, Chen Zhuo, Chen Xiaohong, Tian Wenzhou, Wang Ruoping. The previous versions of the standards replaced by this section are. ---GB/T 2521-1981, GB/T 2521-1988, GB/T 2521-1996, GB/T 2521-2008. Full process cold rolled electrical steel Part 2. Grain oriented steel strip (sheet)

1 Scope

This part of GB/T 2521 specifies grain-oriented electricians with nominal thicknesses of 0.23mm, 0.27mm, 0.30mm, and 0.35mm. Terms and definitions, classifications, symbols and grades, general requirements, technical requirements, inspection and testing, determination and re-inspection rules, packaging, marking Aspirations for quality certificates and ordering contents. This section applies to the grain-oriented electrical steel strip (sheet) supplied in the whole process cold rolling state used in the magnetic circuit structure [hereinafter referred to as steel strip (sheet)].

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document. General provisions of GB/T 247 steel and steel strip packaging, marking and quality certificates GB/T 2522-2007 Electrical steel sheet (with) surface insulation resistance, coating adhesion test method (IEC 60404-11..1999, MOD) GB/T 2900.60 Electrotechnical terminology electromagnetics [GB/T 2900.60-2002, eqvIEC 60050 (121)..1998] GB/T 3655 Method for measuring the magnetic properties of electrical steel sheets (belts) with Epstein squares (GB/T 3655-2008, IEC 60404-2. 1996, IDT) GB/T 9637 Electrotechnical terminology magnetic materials and components [GB/T 9637-2001, eqvIEC 60050 (221)..1990] GB/T 13789 Method for measuring the magnetic properties of electrical steel sheets (belts) with a single-chip tester (GB/T 13789-2008, IEC 60404-3. 2002, IDT) General technical requirements for the delivery of GB/T 17505 steel and steel products (GB/T 17505-2016, ISO 404.2013, MOD) GB/T 18253 Types of inspection documents for steel and steel products (GB/T 18253-2000, eqvISO 10474.1991) GB/T 19289 Method for measuring the density, resistivity and stacking factor of electrical steel sheets (belts) (GB/T 19289-2003, IEC 404- 13.1995, MOD) YB/T 4292 Electrical steel strip (sheet) geometrical characteristics test method (YB/T 4292-2012, IEC 60404-9.1987, MOD)

3 Terms and definitions

The following terms and definitions defined in GB/T 2900.60, GB/T 9637 and YB/T 4292 apply to this document. 3.1 Number of bends numberofbends The maximum number of repeated bendings before the first occurrence of cracks in the substrate (or the sound of cracking was heard) was visually observed. Note. The ductility of the material is indicated by the number of bends. 3.2 Nominal thickness tolerance deviation nominalhicknesstolerance The allowable deviation of the nominal thickness in the same acceptance batch. 3.3 Longitudinal thickness deviation longitudinalthicknesstolerance Parallel to the thickness deviation of a steel sheet or a length of steel strip in the rolling direction. 3.4 Transverse thickness deviation transversethicknesstolerance A deviation perpendicular to the thickness in the rolling direction.

4 classification

4.1 The grade of the steel strip (sheet) in this section is based on the maximum specific loss value P1.7/50 according to the magnetic polarization at 1.7T and the frequency at 50Hz. And steel strip (sheet) nominal thickness (0.23mm, 0.27mm, 0.30mm and 0.35mm) for classification, and according to the maximum ratio total loss value P1.7/50 It is subdivided into three categories. ordinary level, high magnetic polarization level and magnetic domain refinement level. 4.2 This part is divided into two types. trimming and non-cutting according to the delivery conditions of steel strip (sheet).

5 symbols and grades

5.1 The symbols and corresponding descriptions in this section are given in Table 1. Table 1 Symbols and descriptions Symbol unit description PW/kg ratio total loss a P1.5/50 W/kg The total loss measured by magnetic polarization at 1.5T and frequency at 50Hz P1.5/60 W/kg The total loss measured by magnetic polarization at 1.5T and frequency at 60Hz P1.7/50 W/kg The total loss measured by magnetic polarization at 1.7T and frequency at 50Hz P1.7/60 W/kg The total loss measured by magnetic polarization at 1.7T and frequency at 60Hz HA·m-1 magnetic field strength JT magnetic polarization Magnetic polarization of the J800 T magnetic field strength H at 800 A/m (indicated by the peak) BT magnetic induction The magnetic permeability in μ0 H/m vacuum is 4πx10-7 C Ω·mm2/face or Ω·cm2/surface insulation resistance value RA Ω·mm2/piece or Ω·cm2/interlayer resistance R Ω in series with each contact, equal to 5Ω A mm2 or cm2 total area of 10 contacts UV applied to the contacts and the voltage across the 5Ω resistor IA A current measured each time (10 values) a Usually called iron loss. 5.2 Steel grades are composed in the order given below. 100 times the nominal thickness (mm) of the material Characteristic characters. Q--- The initials of the Chinese pinyin indicating the "take" word of the orientation; G--- the initials of the Chinese pinyin indicating the "high" character of high magnetic polarization; H--- The initials of the pinyin of the word "chemical" of "domain refinement". 100 times the maximum specific loss value P1.7/50 (W/kg) Example. 30Q130 represents a common-grade cold-rolled grain-oriented electrical steel strip (sheet) with a nominal thickness of 0.30 mm and a maximum specific loss of P1.7/50 of 1.30 W/kg; 30QG110 represents a high magnetic polarization grade cold rolled grain oriented electrical steel strip with a nominal thickness of 0.30 mm and a maximum specific loss of P1.7/50 of 1.10 W/kg. (sheet); 30QH100 represents a magnetic domain refinement grade cold-rolled grain-oriented electrical steel strip with a nominal thickness of 0.30 mm and a maximum specific loss of P1.7/50 of 1.00 W/kg. (sheet).

6 General requirements

6.1 Production process The production process and chemical composition of the steel are determined by the manufacturer. 6.2 Form of supply The steel strip is supplied in rolls and the steel sheets are supplied in boxes. The specific requirements are as follows. a) The weight of the coil and box should meet the ordering requirements, and the weight of the steel coil is generally 2t~5t; b) The inner diameter of the coil should be 500mm~520mm, and the recommended inner diameter is 508mm; c) the side of the steel sheet stack should be flat, and the near vision is perpendicular to the upper surface; d) The coils shall be tightly wound from steel strips of the same width so that they do not collapse under their own weight and the sides of the coils should be as straight as possible; e) The steel strip may be joined or welded due to the removal of defects. The joints or welds shall be marked. The front and rear of the joint or weld shall be The same grade, and no more than 2, the length of the steel strip between the welds shall not be less than.200m; f) The weld should be flat and does not affect the subsequent processing of the material. 6.3 Delivery conditions The steel strip (sheet) is usually delivered in a trimmed state. When the user has special requirements, the agreement can be delivered without the trimming status. Steel strip before delivery (Slice) Both sides should be coated with an insulating coating. The type of insulating coating is determined by negotiation between the supplier and the buyer. 6.4 Surface conditions 6.4.1 The surface of the steel strip (sheet) should be smooth and free of rust. Allowed within the thickness tolerance and does not interfere with the normal use of the material, allowing There are defects in the dispersion distribution such as scratches, bubbles, cracks, and the like. 6.4.2 The insulating coating on the surface of the steel strip (sheet) should be well adhered, and the color of the coating should be uniform to ensure the cutting operation and the manufacturer's recommendation. The metal is not peeled off during annealing under stress relief annealing conditions. Note. If the product is specified in the protocol to be submerged in liquid, ensure compatibility between the liquid and the coating. 6.5 Shear adaptability The strip should be easy to shear and should be able to cut the strip into the usual shape at any location.

7 Technical requirements

7.1 Magnetic properties 7.1.1 The magnetic properties of steel strips (sheets) provided under 6.3 shall be in accordance with Table 2, Table 3 and Table 4. Aging samples should also meet these characteristic. For coated products, the quality of the insulating coating should be taken into account. 7.1.2 The magnetic properties of the steel strip (sheet) shall be tested in accordance with GB/T 3655, but the steel strip produced in the non-heat-resistant magnetic domain refinement (such as laser scoring method) in Table 4 The magnetic properties of (sheet) shall be tested in accordance with GB/T 13789. After consultation between the supplier and the buyer, the magnetic properties of the steel strip (sheet) can also be tested according to GB/T 13789. The test values shall comply with the requirements of Table 2, Table 3 and Table 4. Note 1. For many years, it has been customary to use magnetic induction. In fact, the Epstein square and the monolithic tester measure the magnetic polarization. Relationship between magnetic induction and magnetic polarization. J=B-μ0H Note 2. There will be differences in the results of the same steel strip (sheet) according to GB/T 3655 and GB/T 13789. Table 2 Magnetic properties and technical characteristics of ordinary grade steel strips (sheets) Brand nominal thickness/mm Maximum specific loss P/(W/kg) P1.5/50a P1.5/60a P1.7/50 P1.7/60b Minimum magnetic polarization J/T 50Hz or 60Hz J800 Minimum stacking factor 23Q110 23Q120 0.23 0.73 0.77 0.96 1.01 1.10 1.20 1.45 1.57 1.82 1.82 0.945 27Q120 27Q130 0.27 0.80 0.85 1.07 1.12 1.20 1.30 1.58 1.68 1.82 1.82 0.950 30Q120 30Q130 0.30 0.79 0.85 1.06 1.15 1.20 1.30 1.58 1.71 1.82 1.82 0.955 35Q145 35Q155 0.35 1.03 1.07 1.36 1.41 1.45 1.55 1.91 2.04 1.82 1.82 0.960 a is the reference value. b According to user requirements, it can be supplied according to P1.7/60. Table 3 Magnetic properties and technical characteristics of high magnetic polarization grade steel strips (sheets) Brand nominal thickness/mm Maximum specific loss P/(W/kg) P1.7/50 P1.7/60a Minimum magnetic polarization J/T 50Hz or 60Hz J800 Minimum stacking factor 23QG085 23QG090 23QG095 23QG100 0.23 0.85 0.90 0.95 1.00 1.12 1.19 1.25 1.32 1.88 1.88 1.88 1.88 0.945 27QG090 27QG095 27QG100 27QG110 0.27 0.90 0.95 1.00 1.10 1.19 1.25 1.32 1.45 1.88 1.88 1.88 1.88 0.950 Table 3 (continued) Brand nominal thickness/mm Maximum specific loss P/(W/kg) P1.7/50 P1.7/60a Minimum magnetic polarization J/T 50Hz or 60Hz J800 Minimum stacking factor 30QG105 30QG110 30QG120 0.30 1.05 1.10 1.20 1.38 1.46 1.58 1.88 1.88 1.88 0.955 35QG115 35QG125 35QG135 0.35 1.15 1.25 1.35 1.51 1.64 1.77 1.88 1.88 1.88 0.960 a According to user requirements, it can be supplied according to P1.7/60. Table 4 Magnetic properties and technical characteristics of magnetic domain refining grade steel strips (sheets) Brand nominal thickness/mm Maximum specific loss/(W/kg) P1.7/50 P1.7/60a Minimum magnetic polarization/T 50Hz or 60Hz J800 Minimum stacking factor 23QH080 23QH085 23QH090 23QH100 0.23 0.80 0.85 0.90 1.00 1.06 1.12 1.19 1.32 1.88 1.88 1.88 1.88 0.945 27QH085 27QH090 27QH095 27QH100 0.27 0.85 0.90 0.95 1.00 1.12 1.19 1.25 1.32 1.88 1.88 1.88 1.88 0.950 30QH095 30QH100 30QH110 0.30 0.95 1.00 1.10 1.25 1.32 1.46 1.88 1.88 1.88 0.955 a According to user requirements, it can be supplied according to P1.7/60. 7.2 Geometric characteristics and tolerances 7.2.1 Thickness 7.2.1.1 Nominal thickness The nominal thickness of the steel strip (sheet) is 0.23 mm, 0.27 mm, 0.30 mm, 0.35 mm. 7.2.1.2 Thickness deviation The thickness deviation of the steel strip (sheet) shall comply with the requirements of Table 5. Table 5 Steel strip (sheet) thickness deviation unit is mm Nominal thickness Nominal thickness tolerance a longitudinal thickness deviation b lateral thickness deviation c no greater than 0.23 ±0.020 0.025 0.015 0.27 ±0.025 0.025 0.015 0.30 ±0.025 0.025 0.015 0.35 ±0.025 0.025 0.015 a The thickness increase at the weld shall not exceed 0.050 mm. b Deviation in thickness of any.2000mm long steel strip or a piece of steel sheet. c Only for steel strips with a width greater than 150 mm. For narrow strips, a separate agreement is required. 7.2.2 Width 7.2.2.1 The width of the steel strip (sheet) can be selected within the width specified by the manufacturer, generally not exceeding 1050 mm. 7.2.2.2 The allowable deviation of the width of the steel strip (sheet) supplied according to the final use width (ie, the strip) shall comply with the requirements of Table 6; The allowable deviation of the width of the steel strip (sheet) supplied within the range shall be 0 2 mm. Table 6 The allowable deviation of the width of the strip after the strip (sheet) is mm Nominal width width tolerance a ≤150 -0.2 >150~400 -0.3 >400~750 -0.5 >750 -0.6 a By agreement, it can be positive deviation. 7.2.3 sickle bend For steel strips (sheets) with a width greater than 150 mm, the boring curve should be measured. The knives of any steel strip (sheet) with a length of.2000 mm should not exceed 0.90mm. 7.2.4 Unevenness For steel strips (sheets) with a width greater than 150 mm, the unevenness shall be measured and the unevenness shall not exceed 1.5%. 7.2.5 residual curvature According to the requirements of the purchaser, and in the contract, the steel strip (sheet) with a width greater than 150mm can detect the residual curvature, and the bottom of the test steel sheet is tested. The distance between the side and the support plate should not exceed 35mm. 7.2.6 burr height The shear burr height of the trimmed steel strip (sheet) should not exceed 0.025 mm. 7.3 Technical characteristics 7.3.1 Density The agreed density for calculating the magnetic properties and the stacking factor is 7.65 kg/dm3. 7.3.2 Stacking factor The minimum stacking factor of the steel strip (sheet) shall comply with the requirements of Table 2, Table 3 and Table 4. 7.3.3 Number of bends The minimum number......
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