1 Scope
This part of GB/T 2521 specifies the terms and definitions, classification, symbol and designation, general requirements, technical requirements, inspection and testing, judgement and reinspection rules, packaging, marking and quality certification as well as order contents of grain non-oriented steel strips (sheets) in nominal thicknesses of 0.35mm, 0.50mm and 0.65mm.
This part is applicable to grain non-oriented steel strip (sheet) [hereinafter referred to as steel strip (sheet)] delivered in the fully-processed cold-rolled state in magnetic structure.
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 247 General Rule of Package, Mark and Certification for Steel Plates (Sheets) and Strips
GB/T 2522-2007 Methods of Test for the Determination of Surface Insulation Resistance and Lamination Factor of Electric Sheet and Strip (IEC 60404-11:1999, MOD)
GB/T 2900.60 Electrotechnical Terminology - Electromagnetism [GB/T 2900.60-2002, eqv IEC 60050(121):1998]
GB/T 3655 Methods of Measurement of the Magnetic Properties of Electrical Steel Sheet and Strip by Means of an Epstein Frame (GB/T 3655-2008, IEC 60404-2:1996, IDT)
GB/T 9637 Electrotechnical Terminology - Magnetic Materials and Components [GB/T 9637-2001, eqv IEC 60050(221):1990]
GB/T 13789 Methods of Measurement of the Magnetic Properties of Magnetic Sheet and Strip by Means of a Single Sheet Tester (GB/T 13789-2008, IEC 60404-3:2002, IDT)
GB/T 17505 Steel and Steel Products - General Technical Delivery Requirements (GB/T 17505-2016, ISO 404:2013, MOD)
GB/T 18253 Steel and Steel Products - Types of Inspection Documents (GB/T 18253-2000, eqv ISO 10474:1991)
GB/T 19289 Methods of Measurement of Density, Resistivity and Stacking Factor of Electrical Steel Sheet and Strip (GB/T 19289-2003, IEC 404-13:1995,MOD)
YB/T 4292 Methods of Determination of the Geometrical Characteristics of Electric Steel Sheet and Strip (YB/T 4292-2012, IEC 60404-9:1987, MOD)
3 Terms and Definitions
For the purposes of this document, the terms and definitions given in GB/T 2900.60, GB/T 9637 and YB/T 4292 and the following apply.
3.1
number of bends
the maximum number of alternating bends possible before the appearance in the base metal of the first crack visible to the naked eye (or the sound of crack heard)
Note: The number of bends constitutes an indication of the ductility of the material.
3.2
nominal thickness tolerance
the tolerance of nominal thickness in an acceptance unit
3.3
longitudinal thickness tolerance
Foreword i
1 Scope
2 Normative References
3 Terms and Definitions
4 Classification
5 Symbol and Designation
6 General Requirements
7 Technical Requirements
8 Inspection and Testing
9 Judgment and Reinspection Rules
10 Packaging, Marking and Quality Certification
11 Order Details
Annex A (Normative) Alternating Bending Test Method
Annex B (Normative) Testing Methods for Coating Insulation Resistance
Annex C (Informative) Mechanical Properties of Grain Non-oriented Electrical Steel Strip (Sheet)
Annex D (Informative) Characteristic and Main Application of Each Designation
Annex E (Informative) Comparison Table of Designations between This Part and IEC 60404-8-4:
Annex F (Informative) Comparison of Chapter and Article Numbers between This Part and IEC 60404-8-4:
Annex G (Informative) Technical Differences between This Part and IEC 60404-8-4:2013 and Their Reasons
