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Q/BQB 480-2021 English PDF

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Q/BQB 480-2021: Cold-rolled non-oriented electrical steel strip delivered in the fully-processed state

Q/BQB 480: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
Q/BQB 480-2021English1019 Add to Cart 5 days [Need to translate] Cold-rolled non-oriented electrical steel strip delivered in the fully-processed state Q/BQB 480-2021
Q/BQB 480-2020English959 Add to Cart 4 days [Need to translate] Cold-rolled non-oriented electrical steel strip delivered in the fully-processed state Q/BQB 480-2020
Q/BQB 480-2018English140 Add to Cart 0--9 seconds. Auto-delivery Full Process Cold Rolled Non-Oriented Electrical Steel Strip Obsolete Q/BQB 480-2018
Q/BQB 480-2014English479 Add to Cart 3 days [Need to translate] The whole-process of cold-rolled non-oriented electrical steel Obsolete Q/BQB 480-2014
Q/BQB 480-2009English349 Add to Cart 3 days [Need to translate] The whole-process of cold-rolled non-oriented electrical steel Obsolete Q/BQB 480-2009

PDF similar to Q/BQB 480-2021


Standard similar to Q/BQB 480-2021

Q/BQB 479   NMPA RULES66   Q/BQB 485   

Basic data

Standard ID Q/BQB 480-2021 (Q/BQB480-2021)
Description (Translated English) Cold-rolled non-oriented electrical steel strip delivered in the fully-processed state
Sector / Industry Chinese Industry Standard
Classification of Chinese Standard QBQ
Word Count Estimation 29,266
Issuing agency(ies) Baoshan Iron & Steel Co., Ltd.

Q/BQB 480-2021: Cold-rolled non-oriented electrical steel strip delivered in the fully-processed state


---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 480-2021 Replaces Q/BQB 480-2020 Full-process cold-rolled non-oriented electrical steel strip release

foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part I. Structure and Drafting Rules for Standardization Documents" drafting. This document is compiled with reference to GB/T 2521.1-2016, JIS C 2552.2014, and IEC 60404-8-4.2013. This document replaces Q/BQB 480-2020. Compared with Q/BQB 480-2020, the main revisions of this document are as follows. --Added ordinary WW and high-efficiency WH products; --Improve the magnetic performance standard of some brand products in Table 3; --Delete high-efficiency B50AH800, B50AH1000 brand products; --Added Table 4 magnetic properties and technical characteristics of ordinary WW and high-efficiency WH products; --Modified the code for the evaluation level of adhesion of insulating coatings; --The standard of longitudinal thickness deviation in Table 7 has been improved; -- Revised Appendix A; -- Revised Appendix B; --Revised Appendix C to delete the 20mm diameter of the adhesion detection device and the evaluation standard; --Revised Appendix D, and added the typical values of magnetic properties and mechanical properties of ordinary WW and high-efficiency WH products; -- Revised Appendix F; -- Revised Appendix G. 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 the Silicon Steel Business Department and the Manufacturing Management Department of Baoshan Iron & Steel Co., Ltd. This document is under the jurisdiction of the Manufacturing Management Department of Baoshan Iron & Steel Co., Ltd. The main drafters of this document. Chen Xiao, Cao Kang, Hu Ling, Shen Jie, Wen Guanghao, Chen Lingyun, Qianqian, Li Haibo, Jin Peiyou, Chen Dong The release status of previous versions replaced by this document are. Q/BQB 480-1999, Q/BQB 480-2007, Q/BQB 480-2009, Q/BQB 480-2014, Q/BQB 480-2018, Q/BQB 480-2020. Full-process cold-rolled non-oriented electrical steel strip

1 Scope

This document specifies the terms and definitions, classification Class and code, general requirements, technical requirements, inspection and testing, packaging, marking and inspection documents and other requirements. This document applies to the full-process cold-rolled products produced by Baoshan Iron and Steel Co., Ltd., used for magnetic circuit structures, and delivered in the final annealed state. Non-oriented electrical steel strip products (hereinafter referred to as products).

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) Adhesives T-peel strength test method flexible material to flexible material

4 categories

The grade of the material in this document is based on the nominal value of the maximum specific total loss P1.5/50(W/kg) at a magnetic polarization of 1.5T and a frequency of 50Hz, The grades are classified according to the nominal thickness of the material, and are subdivided into three types according to product characteristics. ordinary type, stress relief annealing type and high-efficiency type.

5 Symbols and grades

5.1 Symbols and descriptions The symbols and corresponding descriptions in this document are given in Table 1. 5.2 Grade definition The designation of the product is composed in the order given below. 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 usually delivered in trimmed state. When the user has special requirements, it should be negotiated and indicated in the contract when ordering. 6.2.3 The inner diameter of the steel coil should be within the range of 500mm to 520mm, and the recommended inner diameter of the steel coil 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 quality 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 and Table 4.The requirements for magnetic properties after aging shall be determined by the supply and demand sides Negotiate when ordering and indicate in the contract. 7.2 Properties of insulating coatings 7.2.1 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 non-oriented electrical steel insulation 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. 7.2.2 Insulation coating adhesion According to Appendix C (Methods for Testing and Grading Adhesion of Non-oriented Electrical Steel Insulating Coating), the adhesion level of the insulating coating of the product is in accordance with Adhesion is divided into A, B, C, D four grades from high to low. 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. 7.2.3 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. 7.3 Geometric properties and tolerances 7.3.1 Thickness 7.3.1.1 Nominal thickness The nominal thickness of the product is 0.35mm, 0.50mm, and 0.65mm. 7.3.1.2 Thickness tolerance 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 (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 allowable deviation of product thickness shall comply with the provisions in Table 5, and the allowable thickness deviation of strip steel shall be delivered. 7.3.2.1 Width range The width of the product can be selected within the width range specified by the supplier, and the width range of the steel strip should meet the requirements in Table 6. 7.3.2.2 Width tolerance Products can be delivered with trimmed or uncut edges. Uncut means that the edges are in a rolling state, commonly known as rough edges. Allowable deviation of steel strip width Should comply with the provisions of Table 7. 7.3.3 Roughness The unevenness (wavyness) of the product should not be greater than 1.5%. 7.3.4 Sickle The camber provisions for the product only apply when supplied with trimmed edges. 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. 7.3.5 Burr height The specified shear burr height applies only to materials delivered trimmed. The shearing burr height should not be greater than 0.035mm. 7.3.6 Residual curvature The residual curvature of the product is determined by the distance between the bottom edge of the test steel sheet 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. 7.4 Technical characteristics 7.4.1 Agreed Density The agreed density used to calculate the magnetic properties and stacking coefficient of the product shall comply with the provisions in Table 3 and Table 4.For other agreed densities, It must be determined after negotiation between the supplier and the buyer. 7.4.2 Stack factor The stacking factor of the product shall comply with the provisions in Table 3 and Table 4.If the supplier can guarantee it, the test may not be carried out. In arbitration, it applies to all edge coating state. 7.4.3 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 and Table 4.If the supplier can guarantee, it is not necessary Do this test. 7.4.4 Internal stress Products should avoid internal stress as much as possible. The inspection of internal stress is not applicable to steel strips with a width less than or equal to 150mm (longitudinal slitting after the steel belt). Gap measurements should not exceed 2mm. If the supplier can guarantee it, the test may not be carried out.

8 Inspection and testing

8.1 Inspection lot The products shall be inspected and accepted in batches, and each inspection batch shall consist of not more than 20 tons of steel of the same brand, same specification, same heat treatment state, and same insulating 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. 8.3 Surface visual inspection of steel strip The surface appearance quality of the steel strip is inspected with the naked eye. 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 product shall 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 steel strip shearing place and the inner side, and the burr height is equal to the difference between the two thicknesses (h=h2-h1), as shown in Figure 2. Figure 2 Measurement chart of burr height (h) 8.5 Magnetic properties test The magnetic properties are tested according to GB/T 3655.For coated products, the weight of the insulating coating should be included in the calculation. 8.5.1 Magnetic aging test When testing the specific total loss of the product aging sample, the aging sample should be kept at a temperature of 225°C±5°C for 24 hours, and then air-cooled to the room. Warm temperature. 8.5.2 Testing of stress-relieved annealed products Test samples of stress-relieving annealed products shall be measured after stress-relieving annealing for 2 hours at 750°C±10°C. 8.5.3 Anisotropy test for specific total loss With a certain number of transverse samples, when the maximum magnetic polarization is 1.5T and the frequency is 50Hz, the measured specific loss value is P1. For a certain number of longitudinal samples, when the maximum magnetic polarization is 1.5T and the frequency is 50Hz, the measured specific loss value is P2.than the anisotropy of the total loss T (expressed as a percentage) is calculated according to the formula given below, and its value should meet the requirements of Table 3 and Table 4. 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 50mm. 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 P1.5/50 and J5000.If the buyer has special requirements, it can be negotiated when ordering. 11 Numerical rounding off rules The rounding off rules for numerical values shall comply with the provisions of GB/T 8170.

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