GB/T 239.2-2023 in English

《GB/T 239.2-2023金属材料 线材 第2部分：双向扭转试验方法》由TC183（全国钢标准化技术委员会）归口，TC183SC4（全国钢标准化技术委员会力学及工艺性能试验方法分会）执行，主管部门为中国钢铁工业协会。

GB/T 239.2-2023 Metallic materials - Wire - Part 2: Reverse torsion test
1 Scope
This document specifies a method for determining the ability of metallic wire of diameter dimension from 0.3mm to 10.0mm to undergo plastic deformation during reverse torsion.
This document is applicable to detect surface defects, as well as to assess ductility.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
No terms and definitions are listed in this document.
4 Symbols and designations
The symbols and designations used in this document are shown in Figure 1 and specified in Table 1.
Key:
1——Grip;
2——Test piece.
Figure 1 Round wire
Table 1 Symbols and designations

Foreword i
Introduction iii
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and designations
5 Principle
6 Test equipment
7 Test piece
8 Test conditions
9 Test procedure
10 Test report
Bibliography