摘要
1 873 K下,Mo Si2电阻炉上用70 mm×100 mm Mg O坩埚,以SG45VCM钢为研究对象,对不同压力下（33、66、100 k Pa）气相渗氮过程及脱氮过程中氮的溶解行为进行了研究。分别建立了相应的热力学及动力学模型,并在实验室进行了验证。实验发现,氮分压越大溶解度越大,吹氮25 min后钢液中氮达到饱和,吹氩脱气40 min后,钢中氮的质量分数在100×10-6以下。工业试验表明,60 t LF＋VD精炼炉底吹氮气后钢中增氮效果稳定。在LF精炼底吹氩气压力1~1.5 MPa、流量300~400 Nl/min条件下吹氮20~30 min后切换成氩气,VD保真空5~10 min的冶炼工艺条件下,可不添加任何氮化合金,即可生产满足氮含量要求的产品。
The nitrogen dissolution behavior and the process of nitrogen＇s absorption and denitrification in SG45 VCM Steel at different nitrogen partial pressures of 33,66 and 100 k Pa were researched. The experiments were conducted in a Mo Si2 furnace with magnesia crucible of 70 mm ×100 mm at 1 873 K. The thermodynamic and kinetic models were established and verified by experimental data. The results showed that nitrogen solubility increased as the raising of nitrogen pressure. The mass fraction of nitrogen in the steel reached saturation after 25 minutes by blowing nitrogen into the furnace,however that number was lower than 100 × 10- 6after 40 minutes by blowing argon. The industrial test done within 60 t LF ＋ VD showed the nitrogen increasing effect was stable during the process of blowing nitrogen at the bottom of LF. Finally,the qualified product could be produced without any nitralloy added,with the operational parameters below： blowing nitrogen at the bottom of LF under nitrogen partial pressure of 0. 5 ~ 1. 5 MPa,and flow rate of 100 ~ 400 Nl / min,switching nitrogen to argon 20 min later,then being kept in the vacuum state for 5 ~ 12 minutes within VD refining.
出处
《上海金属》
CAS
北大核心
2016年第2期41-45,共5页
Shanghai Metals
基金
国家高技术研究发展计划(No.02080071212211)
辽宁科技学院博士启动基金(No.1406B06)
辽宁省高等学校优秀人才支持计划资助(No.LJQ2015056)
