X70管线钢钙处理研究

来源期刊：钢铁2010年第2期

论文作者：刘建华 包燕平 王敏 李太全 任毅 张帅

文章页码：40 - 44

关键词：管线钢； 夹杂物； 钙处理

Key words：pipeline steel； inclusion； calcium treatment

摘    要：在X70管线钢LF精炼后期分别以100 m/min和200 m/min速度向钢中喂入300~500 m硅钙线或添加硅钙钡铁,对钢中夹杂物进行变性处理。喂钙后钢样、结晶器钢样和铸坯样中的CaTot和夹杂物分析表明:钙处理后钢中钙含量在不断下降;夹杂物的组成、形貌和尺寸也在不断变化。根据钢中夹杂物的变化、夹杂物对高级别管线钢性能和连铸顺行的影响,提出了高级别管线钢生产中夹杂物变性控制策略。

Abstract: 300-500 m SiCa lines were injected with speeds of 100 m/min and 200 m/min or SiCaBaFe alloy was fed into liquid steel to modify the inclusions in the later stage of LF refining of X70 respectively.Samples were taken from molten steel in ladle after injection,molten steel in the mould and slab.The investigation of the CaTot and inclusions shows that: the calcium content in the steel drops after the calcium treatment;the compositions,morphology and sizes of the inclusions varies with the production.Rules for inclusion modification was put forward according to the variation of inclusions and influence of inclusions on the properties of the high grad pipelines and casting.