CAJ | 학술논문

某工厂氧气球罐顶部进气阀连接用不锈钢螺柱在服役过程中发生断裂，采用断口分析、微区能谱分析、化学成分分析和金相检验等方法对螺柱断裂的原因进行了分析。结果表明：螺柱断裂是在工业大气腐蚀环境和外界拉应力共同作用下产生的沿晶型应力腐蚀开裂，其根本原因是由于螺柱所用奥氏体不锈钢化学成分不当，C 含量偏高，Cr 含量偏低，Mn 含量明显偏高而 Ni 含量明显偏低，造成奥氏体不锈钢晶间贫铬，增加了晶间腐蚀敏感性。
모공엄양기구관정부진기벌련접용불수강라주재복역과정중발생단렬，채용단구분석、미구능보분석、화학성분분석화금상검험등방법대라주단렬적원인진행료분석。결과표명：라주단렬시재공업대기부식배경화외계랍응력공동작용하산생적연정형응력부식개렬，기근본원인시유우라주소용오씨체불수강화학성분불당，C 함량편고，Cr 함량편저，Mn 함량명현편고이 Ni 함량명현편저，조성오씨체불수강정간빈락，증가료정간부식민감성。
Fracture of air intake valve stainless studs used for connection in the top of oxygen spherical tank occurred during service process,and means such as fracture analysis,energy spectrum analysis, chemical composition analysis,metallographic examination were used to analyze the reasons of studs.The results show that the fracture of studs was intergranular stress corrosion cracking under the combined ac-tion of industrial atmospheric corrosion environment and tensile stress.The chemical compositions of the studs were unqualified,the content of carbon was higher,the content of chromium was lower,while the content of manganese was significantly higher but the content of nickel was significantly lower than the standard value,it resulted in grain boundary poor chromium,which increased the sensitivity of the studs to stress corrosion cracking.