GB/T 2521.2-2016 English PDF (GBT2521.2-2016)

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GB/T 2521.2-2016: Cold-rolled electrical steel delivered in the fully-processed state -- Part 2: Grain-oriented steel strip (sheet)
GB/T 2521.2-2016
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 2: Grain-oriented Steel Strip (sheet)
(IEC 60404-8-7:2008, Magnetic Materials - Part 8-7: Specifications for Individual
Materials - Cold-rolled Grain-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 ... 15 
9 Determination and Re-inspection Rules ... 19 
10 Packaging, Mark and Quality Certificate ... 19 
11 Content of Order ... 19 
Appendix A (Normative) Repeated Bending Test Method ... 20 
Appendix B (Normative) Test Method of Coating Insulation Resistance ... 22 
Appendix C (Informative) Properties and Main Purposes of Various
Designations ... 23 
Appendix D (Informative) Comparison Table of Designations in this Part and
IEC 60404-8-7:2008 ... 25 
Appendix E (Informative) Comparison Table of Chapter Number in this Part and
IEC 60404-8-7:2008 ... 26 
Appendix F (Informative) Technical Differences and Reasons in this Part and
IEC 60404-8-7:2008 ... 28 
Cold-rolled Electrical Steel Delivered in the Fully-
processed State - Part 2: Grain-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-oriented electrical steel strip (sheet) with the nominal thickness of 0.23
mm, 0.27 mm, 0.30 mm and 0.35 mm.
This Standard is applicable to grain-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 P1.7/50 under the magnetic polarization intensity of 1.7 T and
the frequency of 50 Hz, and the nominal thickness (0.23 mm, 0.27 mm, 0.30 mm and
0.35 mm) of steel strip (sheet). In addition, in accordance with the maximum total loss
as possible;
e) Strip slicing, or welding line might be generated by the elimination of defects.
Such strip slicing, or welding line shall be indicated; strip slicing, or welding line
shall be constituted of the same designation of steel. The number of strip slicing,
or welding line shall not exceed 2; the length of steel strip between 2 welding
lines shall be not less than 200 m;
f) The welding area shall be smooth and shall not affect the subsequent processing
of materials.
6.3 Conditions of Delivery
Generally speaking, steel strip (sheet) shall be delivered in trimmed condition. When
users have any special requirement, untrimmed condition of delivery is also allowable
through negotiation. Before delivery, steel strip (sheet) shall have insulated coating on
both sides. 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, which guarantees that the coating will
not be stripped during the shearing operation and annealing under the stress relieving
and annealing conditions recommended by the manufacturer.
NOTE: if it is stipulated in the agreement that products shall be soaked in liquid, the
compatibility between the liquid and the coating needs to be guaranteed.
6.5 Shear Adaptability
It shall be convenient to shear steel strip. Steel strip shall be able to be sheared into a
normal shape in any position.
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, Table 3 and Table 4. Timeliness-based
sample shall also comp...