Q/BQB 480-2023 Cold-rolled non-oriented electrical steel strip delivered in the fully-processed state
1 Scope
This document specifies the terms and definitions, classification and designation, general requirements, technical requirements, inspection and testing, packaging, marking and labeling, and inspection documents, etc., of the cold-rolled non-oriented electrical steel strip delivered in the fully-processed state with nominal thicknesses of 0.35 mm, 0.50 mm and 0.65 mm.
This document applies to fully-processed cold-rolled non-oriented electrical steel strip products (hereinafter referred to as “products”) supplied in the fully annealed condition intended for the construction of magnetic circuits by Baoshan Iron & Steel Co., Ltd.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. 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 2521.1 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 2791 Adhesives, T peel strength test method for a flexible-to-flexible test specimen assembly
GB/T 2900.60 Electrotechnical terminology - Electromagnetism
GB/T 3655 Methods of measurement of the magnetic properties of electrical steel strip and sheet by means of an Epstein frame
GB/T 4340.1 Metallic materials - Vickers hardness test - Part 1: Test method
GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values
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 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 Reverse bend test method for electrical steel strip and sheet
Q/BQB 400-2020 Package, mark and inspection document for cold-rolled product
IEC 60404-8-4 Specifications for individual materials - Cold-rolled non grain-oriented electronic steel strip and sheet delivered in the fully-processed state
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 2521.1, GB/T 2900.60, GB/T 9637 and YB/T 4292 and the following apply.
3.1 specific total loss (iron loss)
total power consumed per unit mass of material with sinusoidal polarization waveform at the specific peak value and frequency, which is expressed by P(Jm/f) in W/kg
For example, P1.5/50 represents the specific total loss at the maximum magnetic polarization of 1.5T and the frequency of 50 Hz.
3.2 magnetic polarization
peak magnetic polarization at the specific peak magnetic field strength when the sample is alternately magnetized, which is expressed by J(H) in T (Tesla)
For example: J5000 represents the peak magnetic polarization at the peak magnetic field strength of 5000 A/m.
4 Classification
The grades of materials covered by this document are classified according to the maximum specific total loss, P1.5/50 (W/kg) at the magnetic polarization of 1.5T and the frequency of 50Hz, and according to the nominal thickness of the material, and are further classified into ordinary, stress-relief annealed and efficient types according to product characteristics.
5 Symbols and designation
5.1 Symbols and interpretations
For the purposes of this document, the symbols and corresponding interpretations are as shown in Table 1.
Table 1 Symbols and interpretations
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Classification
5 Symbols and designation
6 General requirements
7 Technical requirements
8 Inspection and testing
9 Judgment and retest rules
10 Packaging, marking and labeling, and inspection documents
11 Rules for rounding off of numerical values
12 Information required for ordering
Annex A (Informative)
Annex B (Informative)
Annex C (Normative) Testing and evaluation methods for adherence of insulation coating for non-oriented electrical steels
Annex D (Informative) Typical values of technological properties for representative steel numbers of non-oriented electrical steel products
Annex E (Informative) Precautions for stress-relief annealing
Annex F (Informative) Comparison of similar steel names between this document and relevant domestic and foreign standards
Annex G (Informative) Technical differences between this document and the national standard GB/T 2521.1-2016
