摘要
在真空感应炉中用w(CaO)>98％的CaO砂现场捣打成为坩埚,CaO砂的粒级配比为:4～6mm占5％～10％,1～4mm占40％～50％,<1mm占40％～60％,加入1％～2％的硼酸和氧化铝粉为结合剂,然后在低于CaC_2形成温度(1760℃)下烧结成整体性良好的氧化钙坩埚,并在该坩埚中对铁基合金进行真空熔炼,获得氧、氮和硫的含量均低于7×10^(-6)的超级纯净钢。探讨了在氧化钙坩埚真空感应熔炼过程中钢液的脱氧和脱氮机理,指出炉衬材料的化学稳定性对真空熔炼超低氧钢起决定性作用。
Calcia crucible used in vacuum induction furnace was prepared with lime sand in which the CaO content is more than 98%. Particle size composition of lime sand is that the portion of 4 to 6 mm is 5% to 10% ,1 to 4 mm is 40% to 50%,smaller than 1 mm is 40% to 60% ,and adding 1% to 2% boric acid and alumina powder as binder. The sintering temperature of calcia lining is controlled below 1760 ℃ at which CaC2 is produced. By applying the calcia crucible to vacuum induction melting of iron alloy,ultra-clean steel was obtained. Oxygen,nitrogen and sulfur contents all decreased to below 7 ppm. The mechanisms of deoxidization and denitrification in vacuum induction melting of steel refining in calcia crucible are also discussed. It's pointed out that the chemical stability of lining materials has a fatal importance in vacuum metallurgy to refine ultra-low oxygen steel.
出处
《耐火材料》
CAS
北大核心
2003年第5期267-270,共4页
Refractories
基金
国家自然科学基金(50174048)
"973"国家重大基础研究资助项目(G1998061500)
