Study on anticorrosion property of novel domestic high-nitrogen stainless steel
[Introduction]High-nitrogen stainless steel is highly regarded in fields of aerospace,machinery manufacturing,petrochemistry,and marine engineering due to its advantages i.e.high strength-toughness,fatigue resistance,wear resistance,and corrosion resistance.Much attention has been paid to the preparation process,microstructure,and mechanical properties of high-nitrogen stainless steel during its research and development in China,while there are few studies on its corrosion resistance.[Method]The domestic 30Cr15Mo1N high-nitrogen stainless steels with different sizes of precipitated phases were obtained by tempering at different temperatures(i.e.280 ℃,595 ℃,and 630 ℃).The effect of precipitated phase on the corrosion resistance of 30Cr15Mo1N high-nitrogen stainless steel was studied by electrochemical test,immersion corrosion test,neutral salt spray test,and morphology analysis.[Result]The precipitated phase in 30Cr15Mo1N high-nitrogen stainless steel became more and larger with the increasing of tempering temperature.The high-nitrogen stainless steel tempered at 280 ℃ featured the lowest corrosion rate in different mediums,and the best resistance to electrochemical corrosion and neutral salt spray corrosion.[Conclusion]The precipitated phase has great impact on corrosion behavior of 30Cr15Mo1N high-nitrogen stainless steel,and the increase of precipitated phase in size is not conducive to its corrosion resistance.
high-nitrogen stainless steeltempering temperaturemicrostructurecorrosion resistanceelectrochemical analysisneutral salt spray testimmersion corrosion test
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