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GB/T 2975-1998 English PDF (GBT2975-1998)

GB/T 2975-1998 English PDF (GBT2975-1998)

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GB/T 2975-1998: Steel and steel products - Location and preparation of test pieces for mechanical testing

This Standard specifies the requirements of the mechanical testing, sampling location and sample preparation of the section steel, steel bar, steel plate and steel tube defined in GB/T 15574. Through negotiation on both sides, this Standard may also adopt other metal products for sampling.
GB/T 2975-1998
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
Eqv ISO 377.1997
Replacing GB 2975-82
Steel and Steel Products - Location and
Preparation of Test Pieces for Mechanical
Testing
ISSUED ON. OCTOBER 16, 1998
IMPLEMENTED ON. AUGUST 1, 1999
Approved by. State Quality and Technology Supervision Bureau
Table of Contents
Foreword ... 3
ISO Foreword ... 4
1. Scope ... 5
2. Normative reference ... 5
3. Definitions and signs ... 5
3.1 Definitions ... 5
3.2 Signs ... 7
4. General requirements ... 8
5. Sample condition ... 8
6. Preparation of test pieces ... 9
Annex A (Normative) ... 10
Annex B (Informative) ... 21
Foreword
This Standard equivalently adopts the international standard ISO 377.1997 "Steel and steel products - Sampling location and sample preparation for mechanical testing". Major technical contents in this Standard, such as field of application, sample preparation, sampling location are same as that of ISO 377. According to the actual circumstances in China, it makes more-detailed specification on the allowance when sampling the rough specimen, and makes clear specification on the provisions of horizontal sampling of longitudinal rolling steel plate.
On the basis of the GB 2975-82 "Rules for sampling in mechanical and technological testing of steel products", this Standard adds the specifications on terms, signs, specimen state, sampling location in the thickness direction of the products and the sampling of the square steel tube. In order to be consistent with the provisions of international standard, it makes some changes on the sampling location of the round- steel, hexagon-steel and steel-tube.
This Standard replaces GB 2975-82 "Rules for sampling in mechanical and technological testing of steel products?€?, from the implementation date of this Standard.
Annex A of this Standard is normative; Annex B of this Standard is informative. This Standard was proposed by original Ministry of Metallurgical Industry of the People's Republic of China.
This Standard shall be under the jurisdiction of China Steel Standardization Technical Committee.
Major drafting organizations of this Standard. Iron and Steel Research Institute of original Ministry of Metallurgical Industry, Information Standards Institute of original Ministry of Metallurgical Industry.
Chief Drafting Staffs of this standard. LI Jiulin, Liang Xinbang, Gao Zhenying, Jiang Qingmei.
This Standard was first-time issued in March 1982.
Steel and Steel Products - Location and Preparation of
Test Pieces for Mechanical Testing
1. Scope
This Standard specifies the requirements of the mechanical testing, sampling location and sample preparation of the section steel, steel bar, steel plate and steel tube defined in GB/T 15574. Through negotiation on both sides, this Standard may also adopt other metal products for sampling.
If the product standard or the mutual agreement has other regulations on the sampling, it shall execute that regulations.
2. Normative reference
The following standards contain the provisions which, through reference in this text, constitute the provisions of this Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision. Parties who enter into agreements based on this Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.
GB/T 15574-1995 Classification of steel products
3. Definitions and signs
This Standard adopts the following definitions and signs.
3.1 Definitions
3.1.1 Test unit
According to the product standard or the requirements of the contract, and based on the experiment conducted on the sample product, the number or tons of the take-over or rejected products are referred to test unit (see Figure 1).
3.1.2 Sample product
In test and experiment, extractive part of the test unit (for example. a piece of plate) is referred to sample product (see Figure 1).
3.1.3 Sample
Annex B (Informative)
Selection of the allowance of the rough specimen
B1 While the rough specimen is taken in the method of burning, it must leave adequate allowance from the line of cut of the rough specimen to the fringe of the test piece. It shall be not less than the thickness or diameter of the product in general, but shall be not less than 20 mm at minimum. For the steel products with thickness or diameter greater than 60 mm, their allowance may be appropriate reduced according to the mutual agreement on both sides.
B2 The allowance of the rough specimen in cold shears method shall select according to Table B1.
Table B1 mm
Diameter or thickness Allowance
???4
>4~10
>10~20
>20~35
>35
Thickness or diameter

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