高强度易切削非调质钢的研制  

Development of a High-Strength Free-Cutting Non-Quenched and Tempered Steel

作　　者：王乾 俞杰[1] 周旭[1] 张立文[2] WANG Qian;YU Jie;ZHOU Xu;ZHANG Liwen(Technical Center, Suxin Special Steel Co.,Ltd., Jiangsu Su-Steel Group, Suzhou 215151, Jiangsu China;College of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,Liaoning China)

机构地区：[1]江苏苏钢集团苏州苏信特钢有限公司技术中心,江苏苏州215151 [2]大连理工大学材料科学与工程学院,辽宁大连116024

出　　处：《热处理》2018年第2期30-33,共4页Heat Treatment

摘　　要：苏钢已研制出一种含0.38%～0.45%C、0.30%～0.60%Si、1.20%～1.50%Mn(质量分数)以及适量钒、铌和氮的高强度易切削非调质钢。直径140 mm的圆钢控轧、控冷后,其组织为珠光体和铁素体,力学性能为:R_(el)≥720 MPa,R_m≥950 MPa,A≥20%,Z≥55%,A_(Ku_2)≥60 J,优于相同尺寸的优质调质钢圆钢。One type of high-strength free-cutting non-quenched and tempered steel, containing 0.38% to 0.45%C,0.30% to 0.60% Si, 1.20% to 1.50% Mn（ by mass）, and an amount of vanadium, niobium and nitrogen, has been developed successfully in Susteel. The 140-mm-diam round bar produced by a controlled rolling and controlled cooling technology exhibited microstructure consisting of pearlite and ferrite, and mechanical properties such as yield strength of not less than 720 MPa, tensile strength of not less than 950 MPa, elongation of not less than 20%, reduction in area of not less than 55%,and impact toughness of not less than 60 J, which were superior to those of high quality quenched and tempered steel round bar identical in diameter.

关 键 词：非调质钢 控轧空冷工艺 力学性能 

分 类 号：TG142.41[一般工业技术—材料科学与工程]