本标准制定了防止碳钢精炼设备焊接件（包括压力容器、热交换器、管道、阀体、泵和压缩机壳体）出现大多数形式环境开裂的指南。焊接件的定义包括焊缝熔敷、母材热影响区和受焊接残余应力影响的相邻母材区。它定义了在腐蚀性石油精炼环境中用P-1号钢生产耐环境开裂焊接件的标准实践。该标准由326任务组维护。

This standard establishes guidelines to prevent most forms of environmental cracking of weldments in carbon steel refinery equipment, including pressure vessels, heat exchangers, piping, valve bodies, and pump and compressor cases. Weldments are defined to include the weld deposit, base metal HAZ, and adjacent base metal zones subject to residual stresses from welding. It defines standard practices for producing weldments in P-No. 1 steels resistant to environmental cracking in corrosive petroleum refining environments. This standard is maintained by Task Group 326.