Q195矩形坯中显微夹杂物行为
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摘要
某钢厂为适应市场需求,对Q195钢的生产工艺进行了简化,现为120t转炉→吹氩→连铸。现场对不同炉次和不同工序进行取样,采用氧、氮测试和示踪法以及金相实验等手段,对钢中的氧、氮含量和夹杂物的形貌、尺寸、数量以及分布等进行了系统分析。试验结果显示:试样中氧、氮含量较高,尾坯中T[O]含量最高,可达到254ppm;显微夹杂物中主要以Al_2O_3-SiO_2-MnO类夹杂物存在,尺寸范围为5~15μm,约占38%,且各工序与各炉次中均含有示踪元素La、Ce。因此,钢液在浇注过程中加强保护浇注,减少钢液的二次氧化。与此同时,优化中间包结构和浇注过程的稳定操作是十分必要的。
To satisfy demand of the market,a factory has simplified the production process of Q195steel.It is now 120t converter→argon blowing→continuous casting.The contents of oxygen,nitrogen and themorphology,size,quantity and distribution of the inclusions in the steel were investigated by means of ox-ygen,nitrogen test and tracer method and metallographic experiment.The results show that the oxygenand nitrogen contents in the sample are higher,and the content of T[O]in the tail is the highest,whichcan reach 254ppm.The inclusions are mainly Al_2O_3-SiO_2-MnO inclusions in the range of 5-15μm,About 38%,and the process and the furnace are included in the tracer elements La and Ce.Therefore,the moltensteel in the pouring process to strengthen the protection of casting,reducing the secondary oxidation ofmolten steel,at the same time,to optimize the tundish structure and casting process is very necessary tostabilize the operation.
To satisfy demand of the market,a factory has simplified the production process of Q195steel.It is now 120t converter→argon blowing→continuous casting.The contents of oxygen,nitrogen and themorphology,size,quantity and distribution of the inclusions in the steel were investigated by means of ox-ygen,nitrogen test and tracer method and metallographic experiment.The results show that the oxygenand nitrogen contents in the sample are higher,and the content of T[O]in the tail is the highest,whichcan reach 254ppm.The inclusions are mainly Al_2O_3-SiO_2-MnO inclusions in the range of 5-15μm,About 38%,and the process and the furnace are included in the tracer elements La and Ce.Therefore,the moltensteel in the pouring process to strengthen the protection of casting,reducing the secondary oxidation ofmolten steel,at the same time,to optimize the tundish structure and casting process is very necessary tostabilize the operation.
引文
[1]朴占龙,马军红,王雁,等.Q195连铸板坯生产过程中显微夹杂物行为[J].铸造技术,2017,38(01):175-178.
[2]马军红,朴占龙,王雁,等.Q195钢中显微夹杂物行为研究[J].铸造技术,2017,38(01):172-174+178.
[3]孙学玉,董建君,张彩军,等.Q195钢中夹杂物行为的研究[J].河南冶金,2013,21(02):6-8.
[4]张耀平,王硕明,张树江,等.近终形异型连铸坯中显微夹杂物行为研究[J].钢铁钒钛,2009,30(02):71-74+79.
[5]杨伶俐,刘建华,包燕平,等.X70钢的清洁度在精炼与连铸过程中的变化[J].北京科技大学学报,2007,(s1):97-100.
[6]李长荣,包燕平,刘建华.高级管线钢生产适宜洁净度的研究[J].北京科技大学学报,2007,(s1):10-13.
[7]王雪峰,彭其春.连铸圆坯中夹杂物的综合测定与分析[J].钢铁,2010,45(07):41-46.
[8]孙立根,任英强,刘阳,等.37Mn5钢中的显微夹杂物研究[J].铸造技术,2015,36(10):2 423-2 426.
[2]马军红,朴占龙,王雁,等.Q195钢中显微夹杂物行为研究[J].铸造技术,2017,38(01):172-174+178.
[3]孙学玉,董建君,张彩军,等.Q195钢中夹杂物行为的研究[J].河南冶金,2013,21(02):6-8.
[4]张耀平,王硕明,张树江,等.近终形异型连铸坯中显微夹杂物行为研究[J].钢铁钒钛,2009,30(02):71-74+79.
[5]杨伶俐,刘建华,包燕平,等.X70钢的清洁度在精炼与连铸过程中的变化[J].北京科技大学学报,2007,(s1):97-100.
[6]李长荣,包燕平,刘建华.高级管线钢生产适宜洁净度的研究[J].北京科技大学学报,2007,(s1):10-13.
[7]王雪峰,彭其春.连铸圆坯中夹杂物的综合测定与分析[J].钢铁,2010,45(07):41-46.
[8]孙立根,任英强,刘阳,等.37Mn5钢中的显微夹杂物研究[J].铸造技术,2015,36(10):2 423-2 426.