Foreword
This document is developed in accordance with the rules given in GB/T 1.1-2020 Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents.
This document replaces GB/T 34215-2017 Cold-rolled non-oriented electrical steel strip (sheet) for electric vehicle driving motor. In addition to structural adjustment and editorial changes, the following main technical changes have been made with respect to GB/T 34215-2017:
a) The thickness of 0.25 mm is added (see Clause 1);
b) The symbols and abbreviated terms are modified (see Clause 4; Table 1 of Edition 2017);
c) Two types of products, i.e., high-magnetic-induction high-strength type and high- strength type, have been added (see 5.1);
d) The designation is modified (5.2; 4.2 of Edition 2017);
e) “Requirements for magnetic properties after ageing are agreed by the seller and the buyer” is added (see 8.1.1);
f) One ordinary grade of 25NV1300, three high magnetic induction grades of 20NVP1200, 20NVP1300, 25NVP1300, three high magnetic induction high strength grades of 25NVPS1300, 27NVPS1400 and 30NVPS1500, three high strength grades of 35NVS500, 35NV5550 and 35NVS600, and the magnetic properties and technical characteristics of product of new grades at room temperature are added (see Table 1);
g) Eight ordinary grades of 20WD1300, 27WD1500, 27WD1600, 27WD1700, 30WD1600, 30WD1700, 30WD1800 and 35WD1600 and seven high magnetic induction grades of 27WDG1500, 27WDG1600, 27WDG1700, 30WDG1600, 30WDG1700, 30WDG1800 and 35 WDG2000 are deleted.
h) The 20WD1500 is changed to the 20NV1300 with an agreed density of 7.65 kg/dm3 (see Table 1; Table 2 of Edition 2017);
i) The mechanical properties of the products of new grades at room temperature are added (see Table 2);
j) Delivery at insulating coating state and adhesion requirements are added (see 8.3.1 and 8.3.2);
k) The classification and codes of insulating coatings are added (see Table 3);
l) The product thickness deviation is modified (see Table 4; Table 3 of Edition 2017);
m) Requirement for shear edge deviation caused by internal stress is deleted (see 6.3.4 of Edition 2017);
n) The requirement that product inspection is divided into type inspection and quality consistency inspection is deleted (see 7.1.6 of Edition 2017):
o) The temperature range in Annex D "Measurement of magnetic properties by Epstein frame from 35 ℃ to 200 ℃" is modified (see Annex D; Annex B of Edition 2017).
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.
This document was proposed by China Iron and Steel Association.
This document is under the jurisdiction of National Technical Committee on Iron and Steel of Standardization Administration of China (SAC/TC 183).
本文件起草单位:宝山铜铁股份有限公司、冶金工业信息标准研究院、首钢集团有限公司、张家港扬子江冷轧板有限公司、新余钢铁股份有限公司、湖南华菱涟源钢铁有限公司、无锡普天铁心股份有限公司。
本文件主要起草人:陈晓、胡聆、王波、李倩、朱玉秀、李冉、帅勇、李江、王向阳、沈杰.张维旭、刘君、马允敏、余小琴、田飞、闫成亮、金培有、邵光帅。
This document was firstly issued in 2017; and this edition is the first revision.
Cold-rolled non-oriented electrical steel strip (sheet) for electric vehicle driving motor
1 Scope
This document specifies the symbols and codes, grades, order contents, general requirements, technical requirements, inspection and test, re-inspection and judgment rules, packaging, marking and quality certificates of cold-rolled non-oriented electrical steel strip (sheet) for electric vehicle driving motor.
This document is applicable to the manufacture of grain non-oriented electrical steel strip (sheet) for electric vehicle driving motor with nominal thicknesses of 0.20 mm, 0.25 mm, 0.27 mm, 0.30 mm, and 0.35 mm [hereinafter referred to as "strip (sheet)"].
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 228.1-2021 Metallic materials - Tensile testing - Part 1: Method of test at room temperature
GB/T 228.2-2015 Metallic materials - Tensile testing - Part 2: Method of test at elevated temperature
GB/T 247 General rule of package, mark and certification for steel plates (sheets) and strips
GB/T 2521.1-2016 Cold-rolled electrical steel delivered in the fully-processed state - Part 1: Grain non-oriented steel strip (sheet)
GB/T 2522 Methods of test for the determination of coating insulation resistance and coating adhesion of electrical strip and sheet
GB/T 2900.60 Electrotechnical terminology - Electromagnetism
GB/T 3655 Methods of measurement of the magnetic properties of electrical steel sheet and strip by means of an Epstein frame
GB/T 9637 Electrotechnical terminology - Magnetic materials and components
GB/T 17505 Steel and steel products - General technical delivery requirements
GB/T19289 Methods of measurement of resistivity，density and stacking factor of electrical steel strip and sheet
YB/T 4292 Methods of determination of the geometrical characteristics of electric steel sheet and strip
YB/T 4731-2019 Reverse bend test method for electrical steel strip and sheet
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 2900.60, GB/T 9637 and GB/T 2521.1-2016 apply.
4 Symbols and codes
4.1 Symbols
For the purposes of this document, the following symbols apply.
A50mm: the elongation at break when the original gauge length is 50 mm.
J5000: the magnetic polarization at the magnetic field intensity peak of 5000 A/m.
P1.0/400: the specific total loss at the frequency 400Hz and the magnetic polarization peak of 1.0T.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and codes
