S890钢为近年研发的强度超过900 MPa的Mo-Mn系贝氏体结构钢,本文测定了S890钢的连续冷却曲线,分析了不同冷速下钢的组织和硬度。结果表明:在冷速0.5～45℃/s的范围内,S890钢均可稳定地获得以贝氏体为主的组织;硬度适中且变化幅度较小,表明该钢种具有良好的强韧性配合;当冷速为45℃/s时,可以获得理想的马氏体和贝氏体的复相组织。 S890 steel is a Mo-Mn bainitic structural steel with a strength of more than 900 MPa developed in recent years. The continuous cooling curve of the S890 steel was measured and the microstructure and hardness of the steel under different cooling rates were analyzed. The results show that the bainite-based microstructure of S890 steel can be stably obtained at the cooling rate of 0.5 ~ 45 ℃ / s; the hardness is moderate and the variation range is small, which indicates that the steel has good strength and toughness When the cooling rate is 45 ℃ / s, the ideal martensite and bainite complex phase can be obtained.