Abstract: The properties of Q960E steel 70 mm plate quenched at 890-920 °C and tempered at 560-600 °C are tested, and the microstructure of Q960E steel is analyzed by metallographic microscope (OM) and scanning electron microscope (SEM) . The results show that the strength toughness matching of the steel plate is the best when quenching at 920 ℃ and tempering at 560 °C (UTS 1 048 MPa,YS 1 005 MPa, e1.14% and -40 °C KV₂ 52-61 J), the performance distribution of the steel plate in the full thickness direction is relatively uniform, and the hardness value is 27.5-33HRC, the microstructure from the surface to the center is tempered sorbite and residual austenite.

Key words: Q960E Steel, 70 mm Thickness Plate, Quenching-Tempering, Microstructure, Properties

摘要： 采用890～920℃淬火和560～600℃回火工艺对Q960E钢70 mm板进行性能测试，并利用金相显微镜(OM)、扫描电镜(SEM)对Q960E钢板显微组织进行分析。结果表明：采用920℃淬火和560℃回火工艺的钢板强韧性匹配最优(UTS 1048 MPa， YS 1005 MPa， el.14%，-40℃KV₂ 52～61 J),钢板全厚度方向性能分布相对均匀，硬度值为27.5～33HRC;组织从表面至心部为回火索氏体和残余奥氏体。

关键词: Q960E钢；, 70 mm板, 调质, 组织, 性能