摘要
铁素体不锈钢因在特定温度下有碳化物、氮化物和σ相的析出,及其独有的475℃脆性,致使其存在晶间腐蚀敏感性。改变铁素体不锈钢中铬、钼、碳、氮、铌、钛含量,可以适当降低其晶间腐蚀敏感性。铁素体不锈钢应以退火态供货,在焊接过程中尽可能的采取各种措施来降低焊接过程产生的热量,从而降低其晶间腐蚀敏感性。国内尚未制定铁素体不锈钢晶间腐蚀试验方法标准。通过对铁素体不锈钢的晶间腐蚀机理的阐述,分析铁素体不锈钢晶间腐蚀的影响因素,总结了相关预防措施,提出制定铁素体不锈钢晶间腐蚀试验标准来进一步规范铁素体不锈钢的应用。
The ferrite stainless steel is sensitive to intergranular corrosion because of its eduction of carbides, nitrides and cr phase at certain temperature and its unique embrittlement of 475 ℃. The sensitivity to intergranular corrosion can be appropriately reduced by changing the percentages of Cr, Mo, C, N, Nb and Ti. As the ferrite stainless steel is usually supplied in annealed state, various possible measures should be taken in the welding process to reduce the heat produced in the welding so as to lower its sensitivity to intergranular corrosion. In China, there are no applicable codes and standards for the testing of intergranular corrosion of ferrite stainless steel. The mechanisms of intergranular corrosion of ferrite stainless steel are described, the impact factors of intergranular corrosion of ferrite stainless steel are analyzed, the associated corrosion prevention measures are proposed and preparation of standard for testing of intergranular corrosion of ferrite stainless steel to standardize the application of ferrite stainless steel is recommended.
出处
《石油化工腐蚀与防护》
CAS
2015年第4期62-64,共3页
Corrosion & Protection In Petrochemical Industry
关键词
铁素体不锈钢
晶间腐蚀
机理
ferrite stainless steel, intergranular corrosion, mechanisms
