Abstract：Nitrogen contained low nickel austenitic stainless steel QN1701(12Cr17Mn7Ni2Cu2N)was designed by Thermo-Calc software to replace 443(019Cr21CuTi) ultra pure ferritic stainless steel for elevator. Microstructure and properties of QN1701 and 443 stainless steel were investigated by means of OM, SEM, Electrochemical workstation and other methods. It was shown that yield strength of QN1701 stainless steel was increased to more than 400 MPa and was 1.32 times of that of 443 stainless steel for nitrogen playing a role of grains refining and solution strengthening. The pitting potential of QN1701 stainless steel was 241 mV, which was lower than 289 mV of 443 stainless steel, but its pitting rate was 9.10 g/(m2·h), which was lower than 14.58 g/(m2·h) of 443 stainless steel. The corrosion resistance of QN1701 stainless steel was significantly better than that of 443 stainless steel in the accelerated corrosion tests with environment of 10%NaCl neutral salt spray and cyclic exposure of wet and dry salt spray under the condition of grinding and wire drawing surface for elevator plate. The analysis found that (Nb,Ti) (C,N) precipitations generated by adding a certain amount of Nb and Ti to 443 stainless steel after grinding and wire drawing process, exposed to the surface or left a small pit after being dragged, which led its corrosion resistance to be reduced. In conclusion, QN1701 stainless steel has the characteristics of higher strength, elongation and better corrosion resistance on wire drawing surface, which is of great value for the light-weight design and longer service life of elevator.
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2022, Vol. 32 
