摘要
开发的20 mm低成本铌钛硼微合金化低碳钢板(/%:0.06C、0.40Si、1.60Mn、0.010P、0.005S、0.050Nb、0.012Ti、0.002B)的生产流程为130 t顶底复吹转炉-LF-RH-250 mm板坯连铸-4300轧机轧制-直接淬火-回火工艺。通过终轧≥900℃,以≥20℃/s冷却速度直接淬火,500℃回火,20 mm钢板抗拉强度R_m为855 MPa,屈服强度R_(p0.2)771 MPa,延长率A 16%,0℃冲击功A_(KV2) 217～238 J,-40℃A_(KV2)137～181J。该钢的回火组织为细小的贝氏体板条,宽度为0.5～1.0μm,并有较多弥散分布的30～90 nm Nb+Ti碳氮化物析出。
The production flow sheet for developed 20 mm low cost niobium-titanium-boron microalloying low carbon steel plate （/% ： 0. 06C, 0. 40Si, 1.60Mn, 0. 010P, 0. 005S, 0. 050Nb, 0. 012Ti, 0. 002B） is 130 t top and bottom combined blown converter-LF-RH-250 mm slab casting-4300 mill rolling-direct quenching-tempering process. With end rolling ≥900 ℃ , ≥20℃/s direct quenching and tempering at 500℃ , the tensile strength Rm of the 20 mm steel plate is 855 MPa, yield strength Rp0.2 771 MPa, elongation A 16% , impact energy AKV2 at 0℃ 217 ~238 J and impact energy AKv2 at ~40℃ 137 ~ 181 J. Tempered structure of the steel is fine bainite lath with width 0. 5 ~ 1.0 υm and there are lots of dispersed 30 ~ 90 nm Nb ＋ Ti carbo-nitride precipitates.
出处
《特殊钢》
北大核心
2013年第4期53-55,共3页
Special Steel
