优化精炼工艺生产SPHC钢的洁净度研究  

Study on cleanliness of SPHC steel produced by optimized refining process

作　　者：安航航[1] 包燕平[1] 刘建华[1] 崔衡[1] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083

出　　处：《炼钢》2010年第2期33-36,56,共5页Steelmaking

摘　　要：针对优化精炼工艺生产SPHC钢的洁净度进行研究,采用系统取样和综合分析,对RH精炼后、LF精炼后、中间包和铸坯钢样中T.O和N含量,显微夹杂物的变化规律以及铸坯中大型夹杂物进行了系统的分析。结果表明:采用铁水预处理(脱硫)→120t顶底复吹转炉→RH(钙处理)→连铸工艺生产的SPHC铸坯中的w(T.O)和w(N)分别为23×10-6和17×10-6,化学成分满足要求,每10kg铸坯大型夹杂物为4.76mg,与原工艺生产的铸坯洁净度基本一致,进一步优化RH精炼工艺可使SPHC铸坯具有很高的洁净度。Cleanliness of SPHC steel produced by optimized refining process has been investigated and the total oxygen and nitrogen contents and the law of variation of the micro inclusions as well as the large inclusions in the cast slab and billet after RH and LF refining systematically studied by sampling and analyzing comprehensively. The results show that in the SPHC slab produced by the processing route of hot metal pretreatment （desulphurization）→120 t top and bottom combined blown converter-RH （Ca treatment）-continuous casting the total oxygen content and nitrogen content is 23 × 10^-6 and 17 × 10^-6 respectively and the chemical compositions of the slab are completely in con formity to the requirements and the amount of large inclusions in 10 kg slab is 4. 76 mg, which is basically in agreement with the cleanliness of the slab produced with the origi nal process and higher cleanliness of SPHC slab can be achieved by further optimizing the RH refining process.

关 键 词：SPHC 洁净度 夹杂物 

分 类 号：TF769[冶金工程—钢铁冶金]