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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the China Iron and Steel Association.
This standard is under the jurisdiction of SAC/TC 183 National Technical Committee on Iron and Steel of Standardization Administration of China.
Cold-rolled non-oriented electrical steel strip (sheet) for electric vehicle driving motor
1 Scope
This standard specifies the terms and definitions, symbols and designations, general requirements, technical requirements, inspection and test, re-inspection and judgment rules as well as packaging, marking, quality certificate and order contents of cold-rolled grain non-oriented electrical steel strip (sheet).
This standard is applicable to cold-rolled grain non-oriented electrical steel strips (sheets) [hereinafter referred to as "steel strips (sheets)"] with nominal thicknesses of 0.20mm, 0.27mm, 0.30mm and 0.35mm used for making driving motors of electric vehicle.
2 Normative references
The following referenced documents are indispensable for the application 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 228.1-2010 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 surface insulation resistance and lamination factor of electric sheet and strip
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/T 18253 Steel and steel products - Types of inspection documents
GB/T 19289 Methods of measurement of density, resistivity and stacking factor of electrical steel sheet and strip
YB/T 4292 Methods of determination of the geometrical characteristics of electric steel sheet and strip
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 designations
4.1 Symbols specified in this standard and their corresponding descriptions are shown in Table 1.
Table 1 Symbols and descriptions
Symbol Unit Description
P W/kg Specific total loss a
P1.0/400 W/kg Specific total loss measured at a magnetic polarization of 1.0T and a frequency of 400Hz
H A/m Magnetic field intensity
J T Magnetic polarization intensity
J5000 T Magnetic polarization intensity at a magnetic field intensity (H) of 5,000 A/m (in peak value)
B T Magnetic induction intensity
μ0 H/m Take 4π×10-7 for magnetic conductivity in vacuum
a It is often referred to as iron loss.
4.2 Designation of the steel strip (sheet) consists of the following three parts:
a) 100 times of the nominal thickness of the material, mm.
b) type code:
WD——the ordinary non-oriented electrical steel strips (sheets) for electric vehicles;
WDG——the high magnetic induction non-oriented electrical steel strips (sheets) for electric vehicles.
c) 100 times of the specific total loss P1.0/400 (in W/kg) measured at a magnetic polarization intensity of 1.0 T and a frequency of 400 Hz.
Example:
35WD1900 refers to an ordinary non-oriented electrical steel strip (sheet) for electric vehicles, with a nominal thickness of 0.35mm and a maximum specific total loss P1.0/400 of 19.0 W/kg.
5 General requirements
General requirements shall be consistent with those specified in the general requirements of GB/T 2521.1-2016.
6 Technical requirements
6.1 Magnetic properties
6.1.1 Magnetic properties of the steel strip (sheet) at room temperature shall comply with those specified in Table 2.
6.1.2 The maximum specific total loss P1.0/400 and the minimum magnetic polarization intensity of the steel strip (sheet) at 150℃ are shown in Annex A, but they will not be used as the basis for delivery.
Table 2 Magnetic properties and technical characteristics at room temperature
Type Designation Nominal thickness/mm Conventional density/(kg/dm3) Maximum specific total loss P/(W/kg) Minimum magnetic polarization intensity a J/T Minimum stacking factor
400 Hz
P1.0/400 J5000
Ordinary type 35WD1600 0.35 7.60 16.0 1.63 0.950
35WD1700 7.60 17.0 1.64
35WD1800 7.60 18.0 1.64
35WD1900 7.65 19.0 1.65
35WD2000 7.65 20.0 1.65
35WD2100 7.65 21.0 1.65
30WD1500 0.30 7.60 15.0 1.63 0.945
30WD1600 7.60 16.0 1.63
30WD1700 7.60 17.0 1.64
30WD1800 7.65 18.0 1.64
27WD1400 0.27 7.60 14.0 1.63 0.945
27WD1500 7.60 15.0 1.63
27WD1600 7.60 16.0 1.64
27WD1700 7.65 17.0 1.64
20WD1200 0.20 7.60 12.0 1.62 0.930
20WD1300 7.60 13.0 1.62
20WD1500 7.65 15.0 1.63
High magnetic induction type 35WDG1700 0.35 7.65 17.0 1.66 0.950
35WDG1800 7.65 18.0 1.66
35WDG1900 7.65 19.0 1.67
35WDG2000 7.65 20.0 1.67
30WDG1500 0.30 7.65 15.0 1.66 0.945
30WDG1600 7.65 16.0 1.66
30WDG1700 7.65 17.0 1.67
30WDG1800 7.65 18.0 1.67
27WDG1400 0.27 7.65 14.0 1.65 0.945
27WDG1500 7.65 15.0 1.65
27WDG1600 7.65 16.0 1.66
27WDG1700 7.65 17.0 1.66
a Magnetic induction intensity has been used for many years, but in fact, it is magnetic polarization intensity that the Epstein frame actually measures.
The relationship between the magnetic induction intensity and the magnetic polarization intensity is: J=B-μ0H
6.2 Geometrical characteristics and deviations
6.2.1 Thickness and deviation
6.2.1.1 Nominal thickness
The nominal thicknesses of the steel strip (sheet) are 0.20mm, 0.27mm, 0.30mm and 0.35mm.
6.2.1.2 Thickness deviation
Thickness deviation of the steel strip (sheet) shall comply with those specified in Table 3.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and designations
5 General requirements
6 Technical requirements
7 Inspection and test
8 Re-test and judgment rules
9 Packaging, marking and quality certificate
10 Order contents
Annex A (Informative) Magnetic property and yield strength at 150℃
Annex B (Normative) Method for testing magnetic properties of electrical steel strips (sheets) with Epstein frame at 30℃~200℃
