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针对含硫易切削齿轮钢20CrMnTiH(FQ)的成分特点和质量需求,结合攀钢提钒炼钢厂装备及工艺条件,通过提高入转炉半钢硫含量,选择合理的转炉终点控制、脱氧工艺及过程控铝模式、精炼工艺,采用分段式钙处理工艺分别对A类夹杂物进行变性,在RH处理后实施增硫,制订连铸关键工艺技术参数,打通了半钢炼钢条件下“转炉→LF→RH→200 mm×200 mm方坯连铸”生产该钢种的工艺流程。试验结果表明,试验钢成品成分控制范围较窄,硫成分控制稳定,钢水可浇性良好;连铸坯表面及低倍质量优良,w(T.O)=(11～18)×10-6;夹杂物控制达到预期目标;成材后各项性能均符合要求。
Aiming at the compositional characteristics and quality requirements of 20CrMnTiH (FQ) steel containing sulfur free cutting gear, combined with the equipment and process conditions of vanadium extraction steelmaking plant in Panzhihua Iron and Steel, through the increase of sulfur content of semi-steel into the converter, choose reasonable converter end point control, Process aluminum control mode, refining process, the use of segmented calcium treatment of Class A inclusions were denatured, after the RH treatment of sulfur, the development of continuous casting key technology parameters, opened the semi-steel steel Converter → LF → RH → 200 mm × 200 mm Billet continuous casting "The process of producing the steel. The test results show that the controlled components of the finished steel have a narrow control range, stable sulfur composition and good pourability of the molten steel. The surface and low power of the slab are good, w (TO) = (11-18) × 10-6, inclusions Material control to achieve the desired goals; After the performance of all materials are in line with the requirements.