列举了原国家标准GB/T 238-2002存在的几个技术问题, 论证了对个别条款进行修改的必要性和可行性。新标准增加了图1(典型非圆形试样截面图); 重新划分了表2中圆形线材的直径范围; 对试样矫直的规定进行了补充; 对施加张紧力的规定进行了完善; 修改了终止试验判据中的部分内容。标准起草单位认真收集各方面的意见和建议, 在进行大量验证性试验的基础上完成了标准修订工作。新标准将科学性、规范性和可操作性有机地融合起来, 可以更好地为产品研发和生产实践提供有力支撑。

Several significant technical issues in former national standard GB 238-2002 “Metallic materials-Wire-Reverse bend” were analyzed. The necessity and feasibility to revise the individual clause were also demonstrated. The figure 1 “Typical shaped wire section” was added in new national standard, the range of the nominal diameter of wire in table 2 were modified. The parts of the clause about wire straightening, constraint force and criterion of ending the test were also modified. The opinions and suggestions were collected carefully by standards drafting units, on the basis of a large number of confirmatory test, standard revision work was finished. The new standard would be scientific, normative and maneuverable, to provide the better support for product development and production practice.