Influence of tungsten content and solid solution temperature on corrosion resistance of 022Cr25Ni7Mo3.5WCuN steel
WANG Jihong1,FENG Han2,SONG Zhigang2,LI Ji2,CHEN Deli1,ZHANG Lina1
(1. Technology Center, Fushun Special Steel Co., Ltd., Fushun 113006, Liaoning, China；
2. Special Steel Research Institute, Central Iron and Steel Research Institute, Beijing 100081, China)
The effect of the tungsten content and solution temperature on the pitting corrosion resistance of super duplex stainless steel 022Cr25Ni7Mo3.5WCuN was studied. The pitting corrosion resistance of super duplex stainless steel 022Cr25Ni7Mo3.5WCuN was tested by chemical immersion weight loss method and electrochemical anodic polarization curve method and ThermoCalc thermodynamic calculation was used for the assistant analysis. The results showed that the effect of solution temperature on the pitting corrosion resistance of super duplex stainless steel 022Cr25Ni7Mo3.5WCuN was remarkable. The corrosion resistance of 022Cr25Ni7Mo3.5WCuN reached the optimum at 1 100 ℃. Under ideal solid solution conditions, tungsten was conducive to the formation of passivation film, and the increase of tungsten content enhanced the corrosion resistance of 022Cr25Ni7Mo3.5WCuN. When the tungsten mass fraction was 1.5%, 022Cr25Ni7Mo3.5WCuN had the best corrosion resistance. If the content of tungsten continues increasing, the equilibrium between austenite and ferrite will be broken and the corrosion resistance will be reduced.
王继红，丰涵，宋志刚，李骥，陈德利，张丽娜. 钨含量及固溶温度对022Cr25Ni7Mo3.5WCuN钢耐腐蚀性能的影响[J]. 中国冶金, 2019, 29(9): 33-38.
WANG Jihong,FENG Han,SONG Zhigang,LI Ji,CHEN Deli,ZHANG Lina. Influence of tungsten content and solid solution temperature on corrosion resistance of 022Cr25Ni7Mo3.5WCuN steel[J]. China Metallurgy, 2019, 29(9): 33-38.
