Abstract: The 1900 MPa Ti microaUyed ultra HSLA steel (/% ：0.34C,0.70Si, 1.50Mn,0.012P,0.004S,0.08Ti, 0. 002 0B,0. 004 ON) is developed by 200 kg vacuum induction furnace and 550 mm slab mill. The results show that with first stage starting and final rolling temperature respectively at 1180 °C and 1030 °C in austenite recrystallization zone, and with second stage starting rolling temperature at 920 ~ 950 °C and final rolling temperature at 850 ~ 890 °C in austenite nonrecrystallization zone,then quenching at (900 ± 10)°C and tempering at 200 〜230 °C , the plate precipitated phase is (Ti, Mo)C,the grain size rating is 10,the structure is tempered martensite,with the mechanical properties are Rm 1930 〜1985 MPa,A 10% ~ 12.5% , -40 T K_v2 200 ~ 230 J.

摘要： 通过200 kg真空感应炉和550 mm钢板轧机开发出1900 MPa Ti微合金化超级HSLA钢（/%:0.34C,0.70Si,1.50Mn,0.012P,0.004S,0.08 Ti,0.002 0B,0.004 0N）。结果表明:第一阶段采用奥氏体再结晶区轧制,开轧温度和终轧温度分别在1180℃和1030℃左右,第二阶段采用奥氏体未再结晶区轧制,开轧温度920～950℃,终轧温度850～890℃,热处理淬火温度（900±10）℃,回火温度200～230℃,钢板的析出相为（Ti,Mo）C,晶粒度10级,微观组织为回火马氏体,力学性能为Rm 1930～1985 MPa,A 10%～12.5%,-40℃K_v2 200～230 J。

关键词: 1900MPa级超高强钢, 控制轧制, 淬火加低温回火, 析出相, 力学性能