LF精炼过程中钢液氢含量的变化

 为了研究LF精炼过程氢含量的变化规律，利用贺利氏定氢仪对LF精炼过程钢液氢含量进行测定。结果表明：LF升温阶段和钙处理及软吹氩阶段是LF精炼增氢的主要环节，增氢量(质量分数)分别为0.64×10-6和046×10-6，占LF精炼过程总增氢量的83.33%。 LF升温阶段增氢是由精炼渣和埋弧渣水分所致，LF钙处理及软吹氩阶段增氢是由于喂硅钙线速度过快导致钢液裸露。LF脱硫及合金化阶段是增氢的另一个重要环节，增氢量占LF精炼过程的16.67%，平均增氢量0.22×10-6，是大吹氩时间过长所致.同时研究表明，LF精炼结束随着钢水中氢含量的增大，钢板探伤合格率逐渐降低，其氢质量分数小于(3~4)×10-6时探伤合格率为100%。

Hydrogen Variation of Molten Steel During LF Refining Process

In order to study the law of hydrogen content variation of molten steel and the influence on flaw detection, the hydrogen content in LF refining process was measured by HYDRIS hydrogen analyzer. The results show that temperature raising period, Ca-treatment and soft blowing argon period are the main hydrogen increasing process, as the 83.33% increasing content are 64×10-4 and 46×10-4 respectively. The water in refining slag and submerged arc slag leaded to hydrogen content increasing in temperature raising period, while too fast wire-feeding speed leaded to hydrogen content increasing in Ca-treatment and soft blowing argon period. In addition, the desulfuration and alloying period was another important process for hydrogen increasing as the 16.67% increasing content was 0.22×10-6, and the inducement for this was long time of large blowing argon. The flaw detection qualification rate decreased gradually as the hydrogen content increased in molten steel and the flaw detection qualification rate can reach to 100% when hydrogen content was less than (3-4)×10-6.