Abstract: 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.

摘要： 试验研究了1000℃ 4h和1060℃ 4h固溶处理后022Cr22Ni5Mo3N钢中ϕ75 mm材的组织和力学性能。结果表明,022Cr22Ni5Mo3N钢ϕ75 mm材终锻温度970℃空冷的组织（体积分数)约为铁素体31% ,奥氏体 56%，析出物13%；1 000℃ 4 h固溶后为铁素体38% ,奥氏体60% ,析出物2%；1060℃ 4h固溶后铁素体50%，奥氏体50%,该钢通过釆用1060℃固溶后，拉伸断裂强度731MPa延伸率38%,冲击功AKV(-40℃ ）76~81 J,满足标准要求。

关键词: 022Cr22Ni5Mo3N钢, 固溶温度, 组织, 铁素体, 冲击韧性