Abstract: The yield strength 750 MPa high strength low alloy (HSLA) steel for container (/% : 0.06 ~0.09C, 0.25 ~0.35Si, 1.60 ~1.80Mn, ≤0.015P, ≤0.003S, 0.10 ~0.20Mo, 0.05 ~0.06Nb, 0.09 ~0.llTi, ≥ 0.0015Ca, ≥0.015Alt) has been designed and developed. The process flowsheet for tested steel is 260 t BOF-LF-RH-230 mm slab casting-hot-rolling to 2 ~ 6 mm plate. With the process measures including Nb-Ti compound microalloying and Ca treatment, controlling finishing rolling temperature 840 -880 ℃, lamina flow cooling rate ≥ 60℃ /S, coiling at 520 -580℃ , and hot-rolled coil cooling rate ≤ 10 °C/h， the hot-rolled strip coil has better surface quality, its structure is fine grain ferrite + Nb-Ti carbonitride, and the mechanical properties of strip are upper yield strength 760 〜790 MPa, tensile strength 860 -910 MPa, and elongation 21% ~25% to meet the requirement of user.

摘要： 设计和开发了屈服强度750 MPa低合金高强度集装箱用钢(/%:0.06～0.09C,0.25～0.35Si,1.60～1.80Mn, ≤0.015P,≤0.003S,0.10～0.20Mo,0.05～0.06Nb,0.09～0.11Ti,≥0.0015Ca,≥0.015Alt)。试验钢的工艺流程为260 t BOF-LF-RH-230 mm板坯连铸-热轧成2～6 mm板。通过Nb-Ti复合微合金化和Ca处理,控制精轧结束温度840～880℃,层流冷却速度≥60℃/s,卷取520～580℃,热轧钢卷的冷却速度≤10℃/h等工艺措施,热轧带钢具有良好的表面质量,组织为细晶铁素体+Nb-Ti碳氮化物,力学性能为上屈服强度760～790 MPa,抗拉强度860～910 MPa,伸长率21%～25%,满足用户要求。

关键词: 屈服强度750 MPa低合金高强度钢, 集装箱用钢, 表面质量, 开发