贝氏体型非调质钢的试制.pdf

24 1 Vol. 24, No. 1 2003 3 IRON STEEL VANADI M TITANI M March 2003 胡淑娥, 唐立东, 冯勇, 王祥宾 ( , 250101) :, , V, Mn, Cr Ni, Mo, B,, , : ,860 MPa ; , :; ;; ; :TG142. 1 :A : 1004- 7638(2003) 01- 0066- 05 DEVELOPINGOFNON- QUENCHEDANDTEMPEREDBAINITICSTEEL H Shu- e , TANG Li- dong, FENG Yong, WANG Xiang- bin (T he Technical Center of Jinan Iron Steel Co., Ltd., Jinan 250101, Shandong, China ) Abstract:In order to decrease the product cost, a newly high strength bainitic steel have been devel oped. T his steel is a plain carbon structural steel, its advantage is using cheap V, Mn, Cr instead of expensive Ni, Mo, B and other elements for alloying. Theheat treatment of steelis not needed, so the production process issimply. The heating and rolling schedule are similar with other steels, but adopt ing controlled rolling and air cooling increase the strength and toughness. T he tensile strength of ex perimental steel plates is higher than 860 MPa, and the impact toughness is improved with the de creasing of end rolling temperature. Key ords:non - quenched and tempered steel; bainitic steel; microalloying element; strength; toughness 理钢和微合金化厚板钢而如今,在机械汽车等行 0 引言 业, 非调质钢替代传统的调质钢已经获得了广泛的 非调质钢( SBL) 是1972 年首先由德国蒂森特 应用汽车工业发达的日本,其非调质钢发展最为 钢公司开发成功的, 主要是在中低碳钢中添加Nb, 活跃, 现已采用低温轧制和Nb,V 析出强化相结合, V, Ti 等经 性微合金元素, 抗拉强度小于 600 生产出高强度高韧性的优质汽车用厚钢板; 川崎制 MPa, 可省略结构件(例如汽车曲轴) 的调质处理, 成 铁开发出具有耐大气腐蚀性的非调质极低碳贝氏体 本较低20 世纪70 年代中期以后, 国外主要以低 型厚钢板(570 MPa 和690 MPa 级, 10~ 100 mm) ; 成本高性能产品为主要发展方向, 为了降低成本, 制 已经开发出典型的高强度高韧性建筑机械用非调 造大型LPG 和LNG 贮罐及运输船都采