1215易切削钢钢中显微夹杂物特征研究
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摘要
某钢厂采用转炉→LF精炼→连铸的工艺流程生产1215易切削钢。对不同批次、不同流数的铸坯中全氧、氮含量及显微夹杂物形貌成分进行系统分析。结果显示:钢中[O]含量较高,氧化物夹杂与硫化物夹杂能形成复杂化合物,其形状多为球形或纺锤形,有助于改善钢材切削性能;但钢中[O]含量高,会引起铸坯质量缺陷,要注意改善保护渣成分,优化工艺参数,提高铸坯质量。
The 1215 free-cutting steel is produced in the process of converter →LF refining →continuous casting in a steel mill. The oxygen and nitrogen contents and the micro-inclusions morphology in slags with different batches and different flow numbers were systematically analyzed. The results show that the content of [O] in the steel is high, the inclusions of oxides and sulfide inclusions can form complex compounds, and the shapes of the inclusions are mostly spherical or spindle-shaped, which helps to improve the machinability of steel. However, high [O] content in steel will lead to slab quality defects, so we should pay attention to improve the composition of flux,optimize process parameters, and improve the quality of slab.
The 1215 free-cutting steel is produced in the process of converter →LF refining →continuous casting in a steel mill. The oxygen and nitrogen contents and the micro-inclusions morphology in slags with different batches and different flow numbers were systematically analyzed. The results show that the content of [O] in the steel is high, the inclusions of oxides and sulfide inclusions can form complex compounds, and the shapes of the inclusions are mostly spherical or spindle-shaped, which helps to improve the machinability of steel. However, high [O] content in steel will lead to slab quality defects, so we should pay attention to improve the composition of flux,optimize process parameters, and improve the quality of slab.
引文
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[3]段飞虎.钢中氧含量对硫化物夹杂种类和形态的影响[J].钢铁研究,2016,44(4):20-22.
[4]李梦龙,王福明,孟庆勇,等.硫含量对中碳非调质钢中硫化物及组织的影响.工程科学学报,2015,37(2):168-174.
[5]马登德,周勇,严良封.硫含量对不锈钢夹杂物的影响[J].浙江冶金,2016(3):36-37,60.
[6]段飞虎,朱荣,林腾昌.硫系易切削钢中氧化物对硫化物形成的影响[J].钢铁研究学报,2012,24(1):36-39,43.
[7]夏云进,王福明,王金龙,等.氧含量对易切削钢中硫化物生成行为的影响[J].北京科技大学学报,2010,32(10):1271-1276.
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[2]夏云进.含硫易切削非调质钢中硫化物形成机理与控制研究[D].博士学位论文:北京科技大学,2011.
[3]段飞虎.钢中氧含量对硫化物夹杂种类和形态的影响[J].钢铁研究,2016,44(4):20-22.
[4]李梦龙,王福明,孟庆勇,等.硫含量对中碳非调质钢中硫化物及组织的影响.工程科学学报,2015,37(2):168-174.
[5]马登德,周勇,严良封.硫含量对不锈钢夹杂物的影响[J].浙江冶金,2016(3):36-37,60.
[6]段飞虎,朱荣,林腾昌.硫系易切削钢中氧化物对硫化物形成的影响[J].钢铁研究学报,2012,24(1):36-39,43.
[7]夏云进,王福明,王金龙,等.氧含量对易切削钢中硫化物生成行为的影响[J].北京科技大学学报,2010,32(10):1271-1276.
[8]MCPHERSON M N A,CLEAN M A.Non-Metallic Inclusion in Continuously Cast Steel[M].USA:ISS,1995.