针对方圆铸机生产45Mn2管坯钢易发生水口堵塞及铸坯质量较难控制的难点,采用了炉后渣洗、LF使用高碱度渣精炼、钙处理等技术措施试制45Mn2管坯钢。试验结果表明,半钢炼钢条件下“转炉→LF→Φ200 mm圆坯连铸”生产工艺流程可行,连铸圆坯无表面缺陷及内部缺陷,低倍各项缺陷评级均小于1.0级,轧制后成材率为90.2%,钢材力学性能满足用户要求。 For 45Mn2 tube steel produced by the square casting machine, it is easy to block the nozzle and difficult to control the slab quality. 45Mn2 tube steel is trial-produced by technological measures such as BF slag washing, LF refining with high basicity slag and calcium treatment. The test results show that the production process of “converter → LF → Φ200 mm round billet continuous casting” is feasible under the conditions of semi-steelmaking. The continuous casting round billet has no surface defects and internal defects. The defects of low magnification are less than 1.0 , Rolled finished rate of 90.2%, the mechanical properties of steel to meet user requirements.