Improvement in Stress Corrosion Cracking Resistance of Stainless Steels in Environments Conducive to Localized Pitting Damage

应力腐蚀开裂（SCC）对暴露于氯化物和腐蚀性环境中的基础设施构成严重威胁。提出的项目将表征一种超级双相不锈钢的氯化物- scc裂纹扩展参数，该不锈钢是PVC加工厂剥离氯乙烯单体容器的建造材料。令人震惊的是，船上的焊缝（近50%）出现了广泛的点蚀（这是众所周知的SCC引发因素）和SCC开裂。为了缓解措施，该项目还将调查替代不锈钢品种（如Zeron 100）焊接的点蚀和SCC敏感性。

Stress corrosion cracking (SCC) represents a serious threat to infrastructure exposed to chloride and caustic environments. The proposed project will characterize the chloride-SCC crack propagation parameters for a super duplex stainless steel, which is the material of construction for vessels for stripping vinyl chloride monomer in a PVC processing plant. Alarmingly high numbers the welds (nearly 50%) in the vessel had suffered extensive pitting (which is a well-known SCC initiator) and SCC cracking. For the mitigation measures, the project will also investigate pitting and SCC susceptibility of weldments of alternative varieties of stainless steels, such as Zeron 100.