本标准实施规程提供了缓解方法，以保护奥氏体不锈钢和其他奥氏体合金免受炼油厂设备停机期间可能发生的聚硫氰酸（PTA）应力腐蚀开裂（SCC）的影响。本标准旨在防止由聚硫氰酸（PTA）引起的应力腐蚀开裂（SCC），聚硫氰酸可由氧和水与硫化物腐蚀产物（即金属硫化物）或其他可氧化硫物种（例如硫、硫化氢[H2S]）反应形成。本标准由任务组173维护。

This standard practice provides mitigation methods to protect austenitic stainless steels and other austenitic alloys from polythionic acid (PTA) stress corrosion cracking (SCC) that can occur during a shutdown of refinery equipment. This standard is directed toward preventing stress corrosion cracking (SCC) caused by polythionic acid (PTA) that can be formed by reaction of oxygen and water with sulfide corrosion products (i.e., metal sulfides) or with other oxidizable sulfur species (e.g., sulfur, hydrogen sulfide [H2S]). This standard is maintained by Task Group 173.