Q/BQB 485-2023 Cold-rolled grain-oriented electrical steel strip delivered in the fully processed state
1 Scope
This document specifies the definitions, classification and codes, dimensions, shapes, weights, magnetic properties, inspection and test, packaging, marking and quality certificate of cold-rolled grain-oriented electrical steel strip delivered in the fully processed state with nominal thicknesses of 0.18mm, 0.20mm, 0.23mm, 0.27mm, 0.30mm and 0.35mm.
This document is applicable to the cold-rolled grain-oriented electrical steel strip delivered in the fully processed state (hereinafter referred to as the product) manufactured by Baoshan Iron and Steel Co., Ltd. and delivered in final annealed state.
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 247 General rule of package, mark and certification for steel plates (sheets) and strips
GB/T 2521.2 Cold-rolled electrical steel delivered in the fully-processed state - Part 2: Grain-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 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 13789 Methods of measurement of the magnetic properties of magnetic sheet and strip by means of a single sheet tester
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
YB/T 4731 Reverse bend test method for electrical steel strip and sheet
Q/BQB 400 Package, mark and inspection document for cold-rolled product
IEC 60404-8-7 Specifications for individual materials - Cold-rolled grain-oriented Magnetic materials electrical steel strip and sheet delivered in the fully-processed state
IEC/TR 62581-2010 Methods of measurement of the magnetostriction characteristics by means of single sheet and Epstein test specimens
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 2521.2, GB/T 2900.60, GB/T 9637 and YB/T 4292 as well as the following apply.
3.1 specific total loss (iron loss)
total power absorbed by the material per unit mass when the magnetic polarization changes sinusoidally with specific peak value and frequency, which is expressed by the symbol P(Jm/f) and in the unit of W/kg (or W/lb)
Example: P1.7/50 represents the specific total loss per kg (or lb) of the specimen measured at a magnetic polarization of 1.7T and a frequency of 50Hz; P1.7/60 represents the specific total loss per kg (or lb) of the specimen measured at a magnetic polarization of 1.7T and a frequency of 60Hz.
3.2 magnetic polarization (magnetic induction)
magnetic polarization refers to the peak value of magnetic polarization of a specific magnetic field intensity when the specimen is magnetized by an alternating magnetic field, which is expressed by the symbol J(H) and in the unit of T (Tesla)
Example: J800 represents the magnetic polarization corresponding to the magnetic field intensity H of 800A/m (expressed as a peak value).
3.3 specific apparent power
total power of AC power supply consumed by magnetizing an iron core per unit mass with the set magnetic polarization and frequency, which is expressed by the symbol Ss and in the unit of VA/kg
Example: Ss1.7/50 represents the specific apparent power of the specimen per kg measured at a magnetic polarization of 1.7T and a frequency of 50Hz.
3.4 A-weighted magnetostriction velocity level, LVA
sound pressure level of surface vibration caused by magnetostriction of electric sheet and strip in unit length along the magnetization direction when the magnetic polarization changes sinusoidally with time with a certain calibrated peak value and a calibrated change frequency
3.5 surface insulation resistance
DC resistance measured under specified conditions, that is, the resistance corresponding to the leakage current flowing through the surface of sheet and strip after polarization with DC voltage for a certain time, which is expressed by the symbol C and in the unit of Ω·mm2/side or Ω·cm2/side
3.6 inter-lamination resistance
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Classification
5 Symbols and designations
6 General requirements
7 Technical requirements
8 Inspection and test
9 Judgment and re-inspection rules
10 Packaging, marking and inspection documents
11 Rules of rounding off for numerical values
12 Others
13 Ordering information
Annex A (Normative) Specimen shear method for insulating coating adhesion and large single sheet magnetic properties of grain-oriented electrical steel
Annex B (Informative) Comparison table of similar designations of grain-oriented electrical steel between this document and relevant national and international specifications
Annex C (Informative) Technical differences between this document and the national standard GB/T 2521.2-2016
Annex D (Informative) Typical values of technical property indexes of representative designations of grain-oriented electrical steels in this document
