炼钢

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ER70S-6钢氮氧含量控制

  

  1. (1.北京科技大学 冶金与生态工程学院,北京 100083;2.钢铁冶金新技术国家重点实验室,北京 100083;3.河北钢铁集团 唐山钢铁集团有限责任公司,河北 唐山 063016)
  • 接受日期:1900-01-01 出版日期:2014-10-05

Controlling of nitrogen content and oxygen content on ER70S-6 steel

  • Accepted:1900-01-01 Online:2014-10-05

摘要: 为了降低气保焊丝钢ER70S-6最终产品的氮氧含量、提高焊丝的成材率、改善焊丝的焊接冶金性能,国内某生产厂实行转炉、精炼、连铸全流程控氮氧措施。结果表明:转炉环节氮质量分数降低了3×10-6,精炼工序氮质量分数降低了4×10-6,连铸大包至中包氮质量分数降低了2×10-6,全工艺环节总氮质量分数下降了约11×10-6,轧材成品全氧质量分数平均下降了27×10-6。在夹杂物及组织方面,低倍金相图片显示夹杂物的总体数量有所减少,存在形态由颗粒状及链状变为不连续的点状,分布状态由聚集态向弥散转变,同时高倍金相图片显示,晶粒略有增大,晶粒度有所下降,夹杂物沿晶界析出状况有所好转。

关键词: ER70S-6钢, 氮含量, 氧含量, 夹杂物, 组织

Abstract: Measures had been taken which decreased the content of nitrogen and oxygen, increased the production ration of welding wire and improved the welding metallurgy performance during the producing process of ER70S-6 steel in domestic steel-making plant. The results showed that nitrogen content falled 3×10-6, 4×10-6 and 2×10-6 during converter, refining and continuous casting respectively. Nitrogen content decreased 11×10-6 in whole process and total oxygen content decreased 27×10-6 in roll product. Macro metallographic picture showed that the quantities of inclusions got lower, the diameters of particles becomed smaller, and distribution morphology changed from chain to disperse. Meanwhile the micro metallographic photo showed that the granularity augmented slightly and the inclusions precipitated along the boundary were improved.

Key words: ER70S-6 steel, nitrogen content, oxygen content, inclusions, structure