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设计了一种低碳CuN iCrMnMo钢,并研究了3种热处理工艺(油淬+回火、水淬+回火和轧后直接淬火回火)条件下试验钢的组织与性能。试验钢经油淬和600℃回火1 h,屈服强度Rp0.2=645 MPa,抗拉强度Rm=745 MPa,-60℃冲击吸收能量为138 J;经水淬和650℃回火1 h,屈服强度Rp0.2=668 MPa,抗拉强度Rm=721 MPa,-80℃下冲击吸收能量为216 J。经直接淬火和650℃回火1 h,达到最佳的强韧性匹配,即屈服强度Rp0.2=700 MPa,抗拉强度Rm=764 MPa,-80℃下冲击吸收能量为182 J。
A kind of low carbon CuNiCrMnMo steel was designed and the microstructure and properties of the test steel under three heat treatment conditions (oil quenching + tempering, water quenching + tempering and direct quenching and tempering after rolling) were studied. The test steel was oil quenched and tempered at 600 ℃ for 1 h. The yield strength Rp0.2 = 645 MPa, the tensile strength Rm = 745 MPa, the impact energy absorbed at -60 ° C of 138 J; , Yield strength Rp0.2 = 668 MPa, tensile strength Rm = 721 MPa, impact energy absorption at -80 ° C 216 J. After direct quenching and tempering at 650 ℃ for 1 h, the best ductility matching was obtained, namely yield strength Rp0.2 = 700 MPa, tensile strength Rm = 764 MPa, and impact energy absorption at -80 ° C of 182 J.