GB/T 239.1-2023 English PDF (GBT239.1-2023)

Delivery: 3 seconds. Download true-PDF + Invoice.
Get QUOTATION in 1-minute: Click GB/T 239.1-2023
Historical versions: GB/T 239.1-2023
Preview True-PDF (Reload/Scroll if blank)

GB/T 239.1-2023: Metallic materials -- Wire -- Part 1: Simple torsion test
GB/T 239.1-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.040.10
CCS H 23
GB/T 239.1-2023 / ISO 7800:2012
Replacing GB/T 239.1-2012
Metallic Materials – Wire – Part 1: Simple Torsion Test
(ISO 7800:2012, Metallic Materials – Wire – Simple Torsion Test, IDT)
ISSUED ON: MARCH 17, 2023
IMPLEMENTED ON: OCTOBER 01, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
Introduction ... 5
1 Scope ... 6
2 Normative References ... 6
3 Terms and Definitions ... 6
4 Symbols and Designations ... 6
5 Principle ... 7
6 Testing Equipment ... 7
7 Specimen ... 8
8 Testing Conditions ... 9
9 Procedure ... 9
10 Test Report ... 10
Annex A (Informative) Recommended Types of Jaws Depending on the Diameter d or
Characteristic Dimension h of the Wire ... 12
Annex B (Informative) Evaluation of Fractures Occurring during Simple Torsion Test
... 13
Foreword
This Document was drafted as per the rules specified in GB/T 1.1-2020 Directives for
Standardization – Part 1: Rules for the Structure and Drafting of Standardizing Documents.
This Document was Part 1 of GB/T 239 Metallic Materials – Wire. GB/T 239 has published the
following parts:
--- Part 1: Simple Torsion Test;
--- Part 2: Reverse Torsion Test.
This Document replaced GB/T 239.1-2012 Metallic Materials – Wire – Part 1: Simple Torsion
Test. Compared with GB/T 239.1-2012, the major technical changes of this Document are as
follows besides the structural adjustments and editorial modifications:
--- Increase the typical special-shaped wire type diagram and the free length requirements
between the clamps (see Figure 2 and Table 3 of this Edition);
--- Change the maximum free length between clamps of round wire (see Table 2 of this
Edition; Table 2 of the 2012 Edition);
--- Change the free length between the special-shaped wire clamps (see Table 3 of this
Edition; Table 2 of the 2012 Edition).
This Document equivalently adopts ISO 7800:2012 Metallic Materials – Wires – Simple
Torsion Test.
This Document adds the clauses of “Normative References” and “Terms and Definitions”.
This Document made the minimum editorial modifications:
--- To keep consistent with the current standard, change the standard name into Metallic
Materials – Wires – Part 1: Simple Torsion Test.
--- To distinguish clamp and specimen more clearly, the key “2 – specimen” is added to the
Figure 1;
--- For the convenience of use, sub-map titles have been added in Figure 2; and the center
line has been added for the "T-shaped" standard drawing;
--- Add "NOTEs" in Clause 5 and 9.1;
--- Add "three-jawed clamp" in the diameter range "3≤d (h)≤10" of the tooth surface type in
Table A.1.
Please note some contents of this Document may involve patents. The issuing agency of this
Document shall not assume the responsibility to identify these patents.
This Document was proposed by China Iron and Steel Association.
This Document shall be under the jurisdiction of National Technical Committee on Steel of
Standardization Administration of China (SAC/TC 183).
Drafting organizations of this Document: Guangzhou Customs District Technology Center;
Center of Excellence for Advanced Materials; Shandong Xindadi Holding Group Co., Ltd.;
Guangzhou Shipyard International Company Limited; Nantong Products Quality Supervision
and Inspection Institute; Zhejiang Guojian Testing Technology Co., Ltd.; Shanghai Shenli Testing
Machine Company; Jinan Zhongchuang Testing System Co., Ltd.; China Metallurgical
Information and Standardization Institute; and Wuhan Huatuo Measurement Technology Co.,
Ltd.
Chief drafting staffs of this Document: Li Hao, Li Rongfeng, Fu Chongjian, Zhou Qi, Huang
Jiajian, Chen Jianhao, Sun Guofeng, Ye Yanfeng, Zhang Hongshan, Dong Li, Chen Guifeng,
Sun Dayong, Bao Kui, Zhang Feng, Dong Chenghao, Wang Jingxuan, Hou Huining, and Li
Gan.
The historical editions replaced by this Document are as follows:
--- GB/T 239-1963 Metallic Materials Wire Torsion Test was first-time published in 1963;
first-time revised in 1982; second-time revised in 1984; and third-time revised in 1999;
--- It is divided into parts to be published during the fourth-time revision in 2012; this
Document corresponds to GB/T 239.1-2012 Metallic Materials – Wire – Part 1: Simple
Torsion Test.
--- It is the fifth-time revised hereby.
Metallic Materials – Wire – Part 1: Simple Torsion Test
1 Scope
This Document specifies a method for determining the ability of metallic wire of diameter or
characteristic dimension from 0.1 mm to 14 mm to undergo plastic deformation during simple
torsion in one direction.
After negotiation between relevant parties, the simple torsion test of metallic wire products of
other specifications can be carried out with reference to this Document.
2 Normative References
There are no normative references in this Document.
3 Terms and Definitions
For the purposes of this Document, there are no terms and definitions apply.
4 Symbols and Designations
The symbols and designations used in this Document are shown in Figures 1 and 2, and Table
1.