碳、铌对ASME S30432奥氏体耐热钢晶间腐蚀性能的影响

Effect of Carbon and Niobium on Intergranular Corrosion of ASME S30432 Austenitic Heat Resistant Steel

摘要: 研究了碳、铌含量对ASME S30432钢晶间腐蚀性能的影响.结果表明：当碳含量在0.058%~0.110%变化时,随碳含量增加该钢的晶间腐蚀敏感性增加,易发生晶界腐蚀;铌含量由0.30%增加到0.70%对抗晶间腐蚀性能有改善,含碳量对晶间腐蚀的影响比铌明显;铌含量与碳含量的比值至少在5.8以上才可能对晶间腐蚀有抑制作用.

Abstract: The influence of carbon content and niobium content on the intergranular corrosion of ASME S30432 austenitic heat resistant steel has been investigated.When the carbon content increases from 0.058% to 0.110%,the sensitivity of intergranular corrosion is improved,and intergranular corrosion easily happenes.Increase of niobium content from 0.30% to 0.70% benefites the intergranular corrosion resistance.Carbon content show much more effect on the intergranular corrosion than niobium content.When the ratio of niobium content to carbon content exceedes 5.8 times,it could restrain intergranular corrosion.