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GB/T 2521.2-2016 (GB/T2521.2-2016)

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GB/T 2521.2-2016English150 Add to Cart 0--3 minutes. Auto-delivery. Cold-rolled electrical steel delivered in the fully-processed state -- Part 2: Grain-oriented steel strip (sheet) Valid


GB/T 2521.2-2016: PDF in English (GBT 2521.2-2016)
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 Nameplates ... 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 Nameplates
... 23 
Appendix D (Informative) Comparison Table of Nameplates 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
nameplates, 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-
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 nameplate 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 insulating 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 comply with these properties. In terms of products with coating, the
quality of the insulating coating shall be included in the calculation.
7.3.2 Stacking coefficient
The minimum stacking coefficient of steel strip (sheet) shall comply with the stipulation
in Table 2, Table 3 and Table 4.
7.3.3 Number of bends
The minimum number of bends of steel strip (sheet) that is parallel to the rolling
direction shall be not less than 1 time.
7.3.4 Tolerance of sheared edge triggered by internal stress
Internal stress on steel strip (sheet) shall be minimized. In accordance with the demand
side’s demand, and it shall be indicated in the contract, the tolerance test of sheared
edge that is triggered by internal stress can be conducted on steel strip (sheet) (after
longitudinal slitting) whose width is not less than 500 mm. The measured value of
welding seam shall not exceed 1 mm.
7.3.5 Insulation resistance of coating
In accordance with the demand side’s demand, and through the negotiation between
the demand side and the supply side, the test on the insulation resistance of coating
can be conducted. In addition, the minimum value of insulation resistance of the
coating surface or interlayer resistance shall be indicated in the contract. If steel strip
(sheet) needs thermal treatment, it shall be conducted in accordance with the
conditions appointed by the manufacturer. Furthermore, it shall be indicated in the
contract that insulation resistance of coating shall be tested before or after the thermal
treatment.
NOTE. insulation resistance of coating shall be divided into surface insulation resistance
and interlayer resistance.
8 Test and Inspection
8.1 General Requirements
8.1.1 When an agreement of ordering is signed in accordance with this Part, users can
conduct stipulated test and inspection in accordance with the stipulation in GB/T 17505,
or unstipulated test and inspection. However, in terms of unstipulated test and
inspection, the manufacturer shall provide the total loss ratio and magnetic polarization
intensity of steel strip (sheet).
8.1.2 When the ordered products are tested and inspected in accordance with the
stipulation, users shall be clear and definite about the type of inspection files in GB/T
18253.
8.1.3 Steel strip shall be batched in accordance with coil. Generally speaking, a coil
8.2.3.2 The length of the sample for the test of residual curvature of steel strip (sheet)
shall be 500 mm; the width of the sample shall be the width of steel strip (sheet) under
the delivered state. The axis of the longitudinal direction of the sample shall be parallel
to the rolling direction.
8.2.3.3 The sample for the test of the height of sheared burr shall be taken from steel
strip (sheet) that is delivered as finished products. The recommended length of the
sample shall be not less than 500 mm.
8.2.4 Technical properties
8.2.4.1 Stacking coefficient
In the test of stacking coefficient of steel strip (sheet), the same dimension of sample
shall be stacked to at least 6 mm height. When it is controversial, the sample shall be
constituted of 100 sheets. The minimum width of the sample shall be 20 mm; the
minimum surface area of the sample shall be 5,000 mm2. The tolerance of the width
and length of the sample shall be less than or equal to ± 0.1 mm. Before the test, the
sample shall manifest no obvious burrs.
8.2.4.2 Number of bends
The sample for the test of the number of bends of steel strip (sheet) shall comply with
the stipulation in A.1.
8.2.4.3 Tolerance of sheared edge triggered by internal stress
The sample for the test of the tolerance of sheared edge triggered by internal stress
shall be a steel strip or steel sheet whose length is 1,000 mm.
8.2.4.4 Insulation resistance of coating
The sampling for the test of insulation resistance of coating shall comply with the
stipulation in GB/T 2522-2007.
8.3 Test Methods
8.3.1 General requirements
In terms of each stipulated property, each acceptance batch shall be tested. Unless it
is otherwise stipulated, the test shall be conducted at the temperature of (23 ± 5) °C.
8.3.2 Magnetic properties
The test method of magnetic properties of steel strip (sheet) shall comply with GB/T
3655 or GB/T 13789.
8.3.3 Geometrical characteristics and tolerance
Appendix A
(Normative)
Repeated Bending Test Method
A.1 Sample
Along the rolling direction and avoid the edges of the base material, take a rectangular
sample whose minimum width is 20 mm (general width. 30 mm) and whose length is
250 mm ~ 300 mm. The number of the samples shall be not less than 2. The samples
shall be kept smooth.
A.2 Test Method
A.2.1 The test shall be conducted at the temperature of 23 °C ± 5 °C.
A.2.2 The sample shall be fixated with a lower clamp whose corner radius is 5 mm, as
it is shown in Figure A.1.
A.2.3 The method of counting repeated bends. bending to 90° from the initial position
and returning to the initial position shall be counted as a bend; bending 90° from the
initial position towards the other direction and returning to the initial position shall be
counted as another bend. Count the number of bends in turn.
A.2.4 Continuously bend the sample, until crack emerges (or the sample emits the
sound of crack-generating) for the first time under visual inspection, then, stop the test.
The last bend shall not be counted into the number of bends.
A.3 Test Device
In order to guarantee that the sample can be bended in a fixed position, impose certain
tension on the sample. The recommended tension is approximately 70 N. Please refer
to Figure A.2 for the repeated bending test device.
A.4 Test Result
The minimum value of several test results shall be considered as the ultimate test
result.
Appendix C
(Informative)
Properties and Main Purposes of Various Nameplates
Please refer to Table C.1 for the properties and main purposes of various nameplates.
Table C.1 -- Properties and Main Purposes of Various Nameplates
Nameplate Properties Main Purposes
23Q110
Ordinary level of oriented
electrical steel; relatively low
magnetic induction
Extra-large power generator, large, medium
and small transformer, distribution transformer,
reactor and magnetic amplifier, small power
transformer, instrument transformer, motor
traction transformer, special transformer, etc.
23Q120
27Q120
27Q130
30Q120
30Q130
35Q145
35Q155
23QG085
High magnetic polarization
intensity level of oriented
electrical steel
Large, medium and small transformer,
distribution transformer, reactor and magnetic
amplifier, small power transformer, instrument
transformer, motor traction transformer, special
transformer, etc.
23QG090
23QG095
23QG100
27QG090
27QG095
27QG100
27QG110
30QG105
30QG110
30QG120
35QG115
35QG125
35QG135
23QH080
Magnetic domain refinement
level of oriented electrical steel
(laser grooving)
Large, medium and small transformer, ultra-
high voltage and direct current transformer,
distribution transformer, reactor and magnetic
amplifier, motor traction transformer, special
transformer, etc.
23QH085
23QH090
23QH100
27QH085
27Q090
27QH095
27QH100
30QH095
30QH100
30QH110
Appendix F
(Informative)
Technical Differences and Reasons in this Part and IEC 60404-8-7.2008
Please refer to Table F.1 for technical differences and reasons in this Part and IEC
60404-8-7.2008.
Table F.1 -- Technical Differences and Reasons in This Part and IEC 60404-8-
7.2008
Chapter
Number in
This Part
Technical Differences Reasons
2 Quote corresponding domestic standard.
Domestic standard is formulated and
modified in accordance with corresponding
IEC or ISO standard.
3 Some terms and definitions are added and cancelled.
Existing definitions are quoted in
accordance with Chinese standards.
4.1
In accordance with the maximum total
loss ratio P1.7/50, steel strip (sheet) is
subdivided into three types. ordinary
level, high magnetic polarization
intensity level and magnetic domain
refinement level.
To serialize domestic electrical steel
nameplates.
4.2 The classification of trimmed and untrimmed is added.
Classify in accordance with the delivery
state of steel strip (sheet) edges in the
standard, maintain consistency with other
Chinese standards.
Nameplate is named in accordance
with domestic electrical steel naming
stipulations; conformity and
corresponding description is added.
To make the domestic electrical steel
nameplate unified and systematic. Increase
conformity and corresponding description
for the quotation in the main body in this
Part.
Two nameplates are added (30QG105
and 30Q120); one nameplate is
deleted (30Q140).
In accordance with domestic production,
satisfy the requirement of energy
conservation and emission reduction.
Magnetic domain refinement and non-
magnetic domain refinement products
are distinguished in accordance with
their nameplate.
To make it convenient for the
manufacturer’s production arrangement,
usage and the selection of materials.
7.3.5,
8.2.4.4,
8.3.4.4
The requirements, sampling and test
methods of the test of coating
insulation resistance are added.
To satisfy domestic requirements.
......
 
(Above excerpt was released on 2018-10-26, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GBT2521.2-2016