1.1 本试验方法涵盖了基于电位独立临界点蚀温度（CPT）测定概念的不锈钢和相关合金耐点蚀性评估程序。 1.2 本试验方法适用于锻造和铸造产品，包括但不限于板材、板材、管材、棒材、锻件和焊缝（见 注1 ). 注1: 各种不锈钢的板材、板材、管材和焊接试样的CPT测量示例见参考文献 ( 1. ) . 2. 请参阅研究报告（第节 14 ). 1.3 本试验方法中推荐的标准参数适用于表征奥氏体不锈钢和其他相关合金的CPT，其耐腐蚀性范围从对应于固溶退火UNS S31600（316型不锈钢）到固溶退火的UNS S31254（6%Mo不锈钢）。 1.4 本试验方法可扩展到具有超出本试验方法中所述标准参数给定测量范围的CPT的不锈钢和与不锈钢相关的其他合金。然后必须确定适当的测试电位和溶液。 1.5 以国际单位制表示的数值应视为标准。本标准不包括其他计量单位。 1.6 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者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。 1.7 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 该试验方法预测了不锈钢和相关合金在标准介质中的抗稳定扩展点蚀能力（见 注1 ). CPT测试可用于产品验收、合金开发研究和制造控制。在产品验收的情况下，供应商和用户必须就样品的表面光洁度预处理达成一致。本试验不用于设计目的，因为试验条件以不模拟任何实际使用环境的方式加速腐蚀。 5.2 文献中讨论了用电化学技术测定电位无关CPT的另一种方法 ( 1. 4. ) 该试验方法涉及在不同温度下对试样进行的动电位（电位扫描）程序。 比较 ( 2. ) 本试验方法中所述的试验方法和动电位技术的结果表明所获得的试验结果没有差异。

1.1 This test method covers a procedure for the evaluation of the resistance of stainless steel and related alloys to pitting corrosion based on the concept of the determination of a potential independent critical pitting temperature (CPT). 1.2 This test method applies to wrought and cast products including but not restricted to plate, sheet, tubing, bar, forgings, and welds, (see Note 1 ). Note 1: Examples of CPT measurements on sheet, plate, tubing, and welded specimens for various stainless steels can be found in Ref ( 1 ) . 2 See the research reports (Section 14 ). 1.3 The standard parameters recommended in this test method are suitable for characterizing the CPT of austenitic stainless steels and other related alloys with a corrosion resistance ranging from that corresponding to solution annealed UNS S31600 (Type 316 stainless steel) to solution annealed UNS S31254 (6 % Mo stainless steel). 1.4 This test method may be extended to stainless steels and other alloys related to stainless steel that have a CPT outside the measurement range given by the standard parameters described in this test method. Appropriate test potential and solution must then be determined. 1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.6 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. 1.7 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. ====== Significance And Use ====== 5.1 This test method provides a prediction of the resistance to stable propagating pitting corrosion of stainless steels and related alloys in a standard medium (see Note 1 ). The CPT test can be used for product acceptance, alloy development studies, and manufacturing control. In the case of product acceptance, the supplier and user must agree upon the preconditioning of the specimen with regard to surface finish. The test is not intended for design purposes since the test conditions accelerate corrosion in a manner that does not simulate any actual service environment. 5.2 Another method to determine the potential independent CPT with an electrochemical technique has been discussed in the literature ( 1- 4 ) . This test method involves a potentiodynamic (potential sweep) procedure performed on specimens at different temperatures. A comparison ( 2 ) of the test method described in this test method and the potentiodynamic technique has indicated no difference in the test result obtained.