1.1 这些实践包括以下四个测试: 1.1.1 练习W- 通过蚀刻结构分类检测稳定铁素体不锈钢晶间腐蚀敏感性的草酸蚀刻试验（见章节 3 – 10 ). 1.1.2 实践X- 检测铁素体不锈钢晶间腐蚀敏感性的硫酸铁-硫酸试验（截面） 11 – 16 ). 1.1.3 练习Y- 硫酸铜-50 % 检测铁素体不锈钢晶间腐蚀敏感性的硫酸试验（截面） 17 – 22 ). 1.1.4 练习Z- 硫酸铜-16 % 检测铁素体不锈钢晶间腐蚀敏感性的硫酸试验（截面） 23 – 29 ). 1.2 以下因素决定了这些实践的应用 ( 1- 6. ) : 2. 1.2.1 实践W，草酸试验，是一种通过简单电解蚀刻快速识别某些铁素体合金试样的方法，这些合金不易受到与碳化铬沉淀相关的晶间腐蚀。 规程W用作筛选试验，以避免对可接受样本进行规程X、Y和Z要求的更广泛试验。参见 表1 对于实践W适用的合金列表。 1.2.2 实践X、Y和Z可用于检测某些铁素体合金对与碳化铬或氮化物沉淀相关的晶间侵蚀的敏感性。 1.2.3 实践W、X、Y和Z也可用于评估热处理或熔焊对晶间腐蚀敏感性的影响。 1.2.4 表2 列出了铁素体不锈钢的标识，其中至少有一种标准实践的应用数据可用。 1.2.5 由于与碳化铬或氮化物沉淀无关的冶金因素，某些稳定铁素体不锈钢在通过规程X进行测试时可能显示出较高的速率。 在选择试验方法时必须考虑这种可能性。有成功经验的合金和试验方法的组合如所示 表1 . 生产商和用户将通过具体协议，将这些标准试验应用于其他铁素体不锈钢。 1.3 根据试验和合金，可以通过重量损失测定、显微镜检查或弯曲试验（第节）来完成评估 30 和 31 ). 选项列在中 表1 . 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 有关具体的安全预防说明，请参阅 3.2.5 部分 7. , 13.1 和 19.1 . 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。

1.1 These practices cover the following four tests: 1.1.1 Practice W— Oxalic acid etch test for detecting susceptibility to intergranular attack in stabilized ferritic stainless steels by classification of the etching structures (see Sections 3 – 10 ). 1.1.2 Practice X— Ferric sulfate-sulfuric acid test for detecting susceptibility to intergranular attack in ferritic stainless steels (Sections 11 – 16 ). 1.1.3 Practice Y— Copper-copper sulfate-50 % sulfuric acid test for detecting susceptibility to intergranular attack in ferritic stainless steels (Sections 17 – 22 ). 1.1.4 Practice Z— Copper-copper sulfate-16 % sulfuric acid test for detecting susceptibility to intergranular attack in ferritic stainless steels (Sections 23 – 29 ). 1.2 The following factors govern the application of these practices ( 1- 6 ) : 2 1.2.1 Practice W, oxalic acid test, is a rapid method of identifying, by simple electrolytic etching, those specimens of certain ferritic alloys that are not susceptible to intergranular corrosion associated with chromium carbide precipitation. Practice W is used as a screening test to avoid the necessity, for acceptable specimens, of more extensive testing required by Practices X, Y, and Z. See Table 1 for a listing of alloys for which Practice W is appropriate. 1.2.2 Practices X, Y, and Z can be used to detect the susceptibility of certain ferritic alloys to intergranular attack associated with the precipitation of chromium carbides or nitrides. 1.2.3 Practices W, X, Y, and Z can also be used to evaluate the effect of heat treatment or of fusion welding on susceptibility to intergranular corrosion. 1.2.4 Table 2 lists the identification ferritic stainless steels for which data on the application of at least one of the standard practices is available. 1.2.5 Some stabilized ferritic stainless steels may show high rates when tested by Practice X because of metallurgical factors not associated with chromium carbide or nitride precipitation. This possibility must be considered in selecting the test method. Combinations of alloys and test methods for which successful experience is available are shown in Table 1 . Application of these standard tests to the other ferritic stainless steels will be by specific agreement between producer and user. 1.3 Depending on the test and alloy, evaluations may be accomplished by weight loss determination, microscopical examination, or bend test (Sections 30 and 31 ). The choices are listed in Table 1 . 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific safety precautionary statements, see 3.2.5 , Section 7 , 13.1 , and 19.1 . 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.