30Cr1Mo1V汽轮机转子钢的精炼渣优化  

Optimization of refining slag for 30Cr1Mo1V steam turbine rotor steel

作　　者：刘成松[1] 侯松威 刘晓芹 张华[1] 成日金[1] 倪红卫[1] LIU Chengsong;HOU Songwei;LIU Xiaoqin;ZHANG Hua;CHENG Rijin;NI Hongwei(State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China)

机构地区：[1]武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北武汉430081

出　　处：《钢铁研究学报》2022年第10期1098-1107,共10页Journal of Iron and Steel Research

基　　金：国家自然科学基金资助项目(52074198,51774217,51604201)。

摘　　要：为有效控制30Cr1Mo1V汽轮机转子钢中非金属夹杂物和有害杂质元素含量,利用热力学软件FactSage 8.1,计算了1 873 K下CaO-SiO_(2)-Al_(2)O_(3)-5%MgO系精炼渣与30Cr1Mo1V钢液平衡时的等[O]线、等[S]线,以获得最优精炼渣成分范围。研究了不同精炼渣对钢中氧、硫含量,夹杂物特性的影响,继而揭示了钢中典型MgO·AlO夹杂物的热力学形成机制以及夹杂物与精炼渣之间的成分关系,并构建了“钢-渣”界面MgO·Al_(2)O_(3)夹杂物运动模型。实验和模型结果表明,优化渣系50.4%CaO-40.3%Al_(2)O_(3)-4.3%SiO_(2)-5%MgO对钢液脱氧、脱硫和非金属夹杂物控制的效果明显,模型预测结果与夹杂物去除率对应关系良好。To effectively control non-metallic inclusions and harmful elements contents in 30Cr1Mo1V turbine rotor steel, iso-[O] and iso-[S] lines in CaO-SiO_(2)-Al_(2)O_(3)-5% MgO slag for 30Cr1Mo1V steel at 1 873 K were calculated by thermodynamic software FactSage 8.1. Effects of different refining slags on oxygen and sulfur contents in steel and inclusion characteristics were studied to obtain the optimal composition range of refining slag. Formation mechanism of typical MgO·Al_(2)O_(3) inclusion in 30Cr1Mo1V steel and the relationship between inclusion and refining slag compositions were revealed. A kinetic model was introduced to describe the inclusion behavior at the liquid “steel-slag” interface and predict the removal of MgO·Al_(2)O_(3) inclusion during slag refining. The experimental results and prediction of the kinetic model for inclusion removal after slag refining were in reasonable agreement. The optimized slag system of 50.4%CaO-40.3%Al_(2)O_(3)-4.3%SiO_(2)-5%MgO was obviously beneficial to deoxidation, desulfurization and control of non-metallic inclusions in the liquid 30Cr1Mo1V steel.

关 键 词：30Cr1Mo1V 精炼渣优化 “钢-渣”平衡 动力学模型 非金属夹杂物 镁铝尖晶石 

分 类 号：TF769[冶金工程—钢铁冶金]