电炉短流程生产20~#管坯钢工艺实践

莱钢特钢厂采用50tUHP电炉—LF精炼—大方坯连铸—半连轧短流程代替原模铸工艺生产20#管坯钢。通过实施精料方针、规范脱氧化工艺、优化吹氩处理工艺、选择最佳二冷区配水模型、采取钢水低过热度浇注和全程保护浇注、控制拉速、控制开轧温度等,产品成材率、合格率分别达到95.8%、99.3%,满足了国标要求。

Practice of 20~# Tube Blank Steel Produced by EAF with Compact Process

20~# tube blank steel is produced in the special steel plant of Laigang, with 50tUHP EAF, LF refining, bloom continuous casting, semi-continuous mill short route instead of the original die cast. By carrying out refining raw material guideline, standardizing deoxidation technique, optimizing argon blowing process, selecting optimum water distribution model in second-cooling zone, adopting low degree of superheat casting and overall-protection casting, controlling withdrawal speed and starting roll temperature, the rolling yield and soundness get to 95.8% and 99.3% separately and reach the demand of country standard.