The structure and mechanical properties of 022Cr22Ni5Mo3N steel ϕ75 mm bar solution treated at 1000℃ for 4 h and 1060 ℃ for 4 h have been tested and studied. Results show that the structure （volume percentage） in 022Cr22Ni5Mo3N steel ϕ75 mm bar end forging temperature at 970 ℃，air cooling is about ferrite 31%

austenite 56% and precipitates 13%

that solution-treated at 1000 ℃ for 4 h is ferrite 38%

austenite 60% and precipitates 2%

and that solution-treated at 1060℃ for 4 h is ferrite 50% and austenite 50%. The steel solution-treated at 1 060℃ has tensile strength 731 MPa

elongation 38% and -40 °C impact energy AKV 76-81 J to meet the requirement of standard.