GB/T 2521.1-2016Cold-rolled electrical steel delivered in the fully-processed state -- Part 1: Grain non-oriented steel strip (sheet) (English PDF)

Foreword

GB/T 2521 Cold-rolled Electrical Steel Delivered in the Fully-processed State is divided

into the following two parts.

---Part 1.Grain Non-oriented Steel Strip (sheet)

---Part 2.Grain-oriented Steel Strip (sheet)

This is Part 1 of GB/T 2521.

This Part is drafted in accordance with stipulations in GB/T 1.1-2009.

This Part serves as a replacement of "cold-rolled non-oriented electrical steel strip

(sheet)" in GB/T 2521-2008 Cold-rolled Grain-oriented and Non-oriented Electrical

Steel Strip (sheet). In comparison with GB/T 2521-2008, there are several main

technical changes as follows.

---The name of the Standard is adjusted into Cold-rolled Electrical Steel Delivered

in the Fully-processed State - Part 1.Grain Non-oriented Steel Strip (sheet);

---All content regarding cold-rolled-oriented electrical steel is deleted;

---The range of the internal diameter of steel coil is added;

---The requirements and test methods of anisotropy of the total loss ratio of cold-

rolled non-oriented electrical steel strip (sheet) are added;

---6 designations are added, namely. 35W210, 65W310, 65W350, 65W400,

65W470 and 65W530; 10 designations are cancelled, namely. 35W330,

35W400, 50W330, 50W530, 50W700, 50W1300, 65W700, 65W1000,

65W1300 and 65W1600;

---The magnetic polarization of some designations is improved;

---"Magnetic properties" is modified into "magnetic performance"; "process

properties" is modified into "technical properties";

---The longitudinal thickness tolerance and transverse thickness tolerance of steel

strip (sheet) are adjusted;

---The requirements and test methods of the tolerance of sheared edges triggered

by internal stress are added;

---Appendix A (normative) Repeated Bending Test Method is added;

---Appendix B (normative) Coating Insulation Resistance Test Method is added;

---The tensile strength, elongation index and inspection method of various

designations are deleted; in order to make it convenient for reference, grain

non-oriented electrical steel strip (sheet) mechanical properties is modified into

informative appendix (please refer to Appendix C);

---Appendix D (informative) Properties and Main Purposes of Various

Designations is added;

---Chapter 10 "Objection" is deleted.

This Part adopts the re-drafting law for modification in accordance with IEC 60404-8-

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.

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.

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.

Transverse thickness tolerance refers to the thickness tolerance that is vertical to the

rolling direction.

4 Classification

In this Part, the delivery conditions of steel strip (sheet) can be classified into two

types. trimmed steel strip and untrimmed steel strip.

5 Symbols and Designations

Steel designation shall be constituted of the following sequence.

For example. 50W400 signifies cold-rolled grain non-oriented electrical steel under the

nominal thickness of 0.50 mm and the maximum total loss ratio P1.5/50 of

6 General Requirements

Steel strip shall be delivered in coils; steel sheet shall be delivered in boxes. Please

see the specific requirements below.

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

In accordance with the demand side's demand, and it shall be indicated in the content,

the residual curvature of steel strip (sheet) whose width is more than 100 mm can be

tested. The distance between the bottom margin of the tested steel sheet and the

support plate shall not exceed 35 mm.

8 Test and Inspection

The sample for the test of the number of bends of steel strip (sheet) shall comply with

the stipulation in A.1.

The width of steel strip (sheet) shall be tested along the vertical axis of vertical steel

strip or steel sheet.

9 Determination and Re-inspection Rules

The determination and re-inspection rules of steel strip (sheet) shall comply with the

stipulation in GB/T 17505.

10 Packaging, Mark and Quality Certificate

The packaging, mark and quality certificate of steel strip (sheet) shall comply with the

stipulation in GB/T 247.

11 Content of Order

When users order products in accordance with this Part, the following documents shall

be provided.

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