GB/T 2521.1-2016 English PDF (GBT2521.1-2016)

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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 2521.1-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.40
H 53
Partially replacing GB/T 2521-2008
Cold-rolled Electrical Steel Delivered
in the Fully-processed State - Part 1:
Grain Non-oriented Steel Strip (sheet)
(IEC 60404-8-4:2013, Magnetic Materials - Part 8-4: Specifications for
Individual Materials - Cold-rolled Non-oriented Electrical Steel Strip and Sheet
Delivered in the Fully-processed State, MOD)
ISSUED ON: JUNE 14, 2016
IMPLEMENTED ON: MAY 1, 2017
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration Committee of the People’s
Republic of China.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative References ... 5 
3 Terms and Definitions ... 6 
4 Classification ... 6 
5 Symbols and Designations ... 7 
6 General Requirements ... 8 
7 Technical Requirements ... 9 
8 Test and Inspection ... 13 
9 Determination and Re-inspection Rules ... 17 
10 Packaging, Mark and Quality Certificate ... 17 
11 Content of Order ... 17 
Appendix A (Normative) Repeated Bending Test Method ... 18 
Appendix B (Normative) Test Method of Coating Insulation Resistance ... 20 
Appendix C (Informative) Mechanical Properties of Grain Non-oriented
Electrical Steel Strip (sheet) ... 21 
Appendix D (Informative) Properties and Main Purposes of Various
Designations ... 22 
Appendix E (Informative) Comparison Table of Designations in this Part and
IEC 60404-8-4:2013 ... 24 
Appendix F (Informative) Comparison Table of Chapter Number in this Part and
IEC 60404-8-4:2013 ... 25 
Appendix G (Informative) Technical Differences and Reasons in this Part and
IEC 60404-8-4:2013 ... 28 
Cold-rolled Electrical Steel Delivered
in the Fully-processed State - Part 1:
Grain Non-oriented Steel Strip (sheet)
1 Scope
This Part of GB/T 2521 specifies the terms, definitions, classification, symbols and
designations, general requirements, technical requirements, test and inspection,
determination and re-inspection rules, packaging, mark, quality certificate and content
of order of grain non-oriented electrical steel strip (sheet) with the nominal thickness
of 0.35 mm, 0.50 mm and 0.65 mm.
This Standard is applicable to grain non-oriented electrical steel strip (sheet)
[hereinafter referred to as steel strip (sheet)] that is applied to magnetic circuit structure
under fully-processed cold-rolled delivered state.
2 Normative References
The following documents are indispensable to the application of this Standard. In terms
of references with a specified date, only versions with a specified date are applicable
to this Standard. The latest version (including all the modifications) of references
without a specified date is also applicable to this Standard.
GB/T 247 General Rule of Acceptance, 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
Those defined in GB/T 2900.60, GB/T 9637 and YB/T 4292, and the following terms
and definitions are applicable to this Standard.
3.1 Number of Bends
Number of bends refers to the maximum number of repeated bends before substrate
manifests crack (or emits the sound of crack-generating) under visual observation.
NOTE: number of bends is utilized to signify the extensibility of a material.
3.2 Nominal Thickness Tolerance
Nominal thickness tolerance refers to the allowable tolerance of nominal thickness in
the same acceptance batch.
3.3 Longitudinal Thickness Tolerance
Longitudinal thickness tolerance refers to the thickness tolerance that is parallel to the
rolling direction of the previous steel sheet or on a certain length of steel strip.
3.4 Transverse Thickness Tolerance
Transverse thickness tolerance refers to the thickness tolerance that is vertical to the
rolling direction.
4 Classification
4.1 In this Part, the grade of steel strip (sheet) can be classified in accordance with the
maximum total loss ratio P1.5/50 under the magnetic polarization intensity of 1.5 T and
Steel strip (sheet) can be delivered in trimmed or untrimmed condition. Generally
speaking, before delivery, steel strip (sheet) shall have insulating coating on a single
side or both sides, or steel strip (sheet) can be delivered without insulating coating.
The type of insulating coating shall be determined by the supply side and the demand
side through negotiation.
6.4 Surface Quality
6.4.1 The surface of steel strip (sheet) shall be smooth and clean; there shall be no
corrosion. Scattered defects, such as scratch, bubble and crack, are allowed to exist
when they are within the range of thickness tolerance and do not affect the normal
utilization of the material.
6.4.2 The insulating coating on the surface of steel strip (sheet) shall be favorably
attached; the color of the coating shall be even. The coating shall not be stripped during
the operation of shearing. During the process of repeated bending test (please refer to
8.3), the coating shall not manifest stripping after 90° bending. If the coating is stripped,
conduct shear test of the test piece where the sample is taken. During the shear test,
large-area stripping of the coating is not allowed. However, slight chippings on the
sheared edge of the coating are allowed.
6.5 Shear Adaptability
It shall be convenient to shear or stamp steel strip, which guarantees that steel strip
can be sheared into a normal shape in any position. If the demand side has a special
demand, the supply side and the demand side shall determine it through negotiation.
7 Technical Requirements
7.1 Magnetic Properties
7.1.1 The magnetic properties of steel strip (sheet) provided under the condition of 6.3
shall comply with the stipulation in Table 2. Timeliness-based sample shall also comply
with these properties. In terms of products with coating, the quality of the insulating
coating shall be included in the calculation.
7.1.2 The magnetic properties of steel strip (sheet) shall be tested in accordance with
GB/T 3655. Through the negotiation between the supply side and the demand side, it
can also be tested in accordance with GB/T 13789. Under this circumstance,...