ISO 16540:2015提供了使用四点弯曲试验评估金属（包括碳钢、低合金钢和耐腐蚀合金（CRA））抗应力腐蚀开裂能力的指南。该方法为母材和焊缝的测试提供了指导，包括针对应力应变行为中没有明显屈服点的金属以及具有明显屈服点的金属的程序。本国际标准的重点是四点弯曲试验的通用方法。服务申请将有所不同，并在适当情况下参考相关行业标准。

ISO 16540:2015 provides guidelines for the use of four-point bend testing to evaluate the resistance of metals including carbon steel, low alloy steels, and corrosion resistant alloys (CRAs) to stress corrosion cracking. The method gives guidance on testing of both parent plate and welds and includes procedures for metals that have no distinct yield point in their stress-strain behaviour as well as metals with a distinct yield point. The emphasis in this International Standard is on the generic methodology of the four-point bend test. Service application will be varied and the relevant industry standard is to be consulted where appropriate.