通过试验研究了150 t顶底复吹转炉—150 t LF炉—薄板坯连铸连轧流程钢液w(N)的变化。研究发现:转炉出钢、吹氩操作、LF炉精炼和连铸过程均可能增氮,自转炉出钢至LF炉精炼开始过程和钢水从大包进入中间包过程增氮最为严重,平均增氮都接...通过试验研究了150 t顶底复吹转炉—150 t LF炉—薄板坯连铸连轧流程钢液w(N)的变化。研究发现:转炉出钢、吹氩操作、LF炉精炼和连铸过程均可能增氮,自转炉出钢至LF炉精炼开始过程和钢水从大包进入中间包过程增氮最为严重,平均增氮都接近20×10-6。对影响钢液增氮的一些因素进行了讨论,提出了相应的改进措施。展开更多
This paper attempts to clarify the systematic works of the refractories for the RH degassers and the ways of improving their lining life. It includes ： （ 1 ） types of RH degassers ; （2） the operating conditions o...This paper attempts to clarify the systematic works of the refractories for the RH degassers and the ways of improving their lining life. It includes ： （ 1 ） types of RH degassers ; （2） the operating conditions of refining and the severely damaged areas in RH degassers ; （3） the reasons why side wall and bottom of lower vessel, throat and snorkels become the severe wear areas are analyzed, such as erosion and abrasion caused by the high circula- tion rate of treated molten steel, thermal and structural spalling by the violent temperature change, high corrosion by the Fe-oxides containing siliceous slag and CaF：riched desulfurization powders attack, degradation of texture by the vaporization of refractory components in vacuum and in oxygen blowing; besides the above men- tioned factors, what other reasons to make the snorkels become the most quick wear elements are also explained; （4） the studies of resistance to refining slags attack and slag penetration and its prevention ; the evaluation of va- rious refractory materials to withstand the attack of slags is based on the experimental results of rotating cylinder method, rotary drum test and induction furnace test, and the phase diagrams analyses; the measures to reduce the slag penetration are discussed, for example the deep of slag penetration can be decreased by reducing the size of brick pores ; （5） suitable refractory materials selection and recent developments for the different severe wear areas in RH, and lining maintenance; （6） refractories for RH to refine silicon steel; （7） the ways of improving RH lining life.展开更多
基于氢对钢材质量的影响及脱氢机理,分析真空脱氢的影响因素,总结承钢120 t VD炉在试生产期间进行的真空脱氢生产实践。实践表明,通过控制氢的来源和在VD炉脱氢过程中控制溶渣、真空度、氩气流量和压力,VD脱氢后氢含量(质量分数)被控制...基于氢对钢材质量的影响及脱氢机理,分析真空脱氢的影响因素,总结承钢120 t VD炉在试生产期间进行的真空脱氢生产实践。实践表明,通过控制氢的来源和在VD炉脱氢过程中控制溶渣、真空度、氩气流量和压力,VD脱氢后氢含量(质量分数)被控制在1.2×10^(-6)以下。展开更多
文摘通过试验研究了150 t顶底复吹转炉—150 t LF炉—薄板坯连铸连轧流程钢液w(N)的变化。研究发现:转炉出钢、吹氩操作、LF炉精炼和连铸过程均可能增氮,自转炉出钢至LF炉精炼开始过程和钢水从大包进入中间包过程增氮最为严重,平均增氮都接近20×10-6。对影响钢液增氮的一些因素进行了讨论,提出了相应的改进措施。
文摘This paper attempts to clarify the systematic works of the refractories for the RH degassers and the ways of improving their lining life. It includes ： （ 1 ） types of RH degassers ; （2） the operating conditions of refining and the severely damaged areas in RH degassers ; （3） the reasons why side wall and bottom of lower vessel, throat and snorkels become the severe wear areas are analyzed, such as erosion and abrasion caused by the high circula- tion rate of treated molten steel, thermal and structural spalling by the violent temperature change, high corrosion by the Fe-oxides containing siliceous slag and CaF：riched desulfurization powders attack, degradation of texture by the vaporization of refractory components in vacuum and in oxygen blowing; besides the above men- tioned factors, what other reasons to make the snorkels become the most quick wear elements are also explained; （4） the studies of resistance to refining slags attack and slag penetration and its prevention ; the evaluation of va- rious refractory materials to withstand the attack of slags is based on the experimental results of rotating cylinder method, rotary drum test and induction furnace test, and the phase diagrams analyses; the measures to reduce the slag penetration are discussed, for example the deep of slag penetration can be decreased by reducing the size of brick pores ; （5） suitable refractory materials selection and recent developments for the different severe wear areas in RH, and lining maintenance; （6） refractories for RH to refine silicon steel; （7） the ways of improving RH lining life.
