20CrMnTiH冶炼全流程夹杂物演变分析

Evolution analysis of inclusions in the whole process of 20CrMnTiH smelting

  • 摘要: 为明确冶炼过程中齿轮钢中的非金属夹杂物的演变行为, 实现对钢中夹杂物特性的有效控制和提高产品质量, 以20CrMnTiH齿轮钢为研究对象, 通过对"BOF-CAS-LF-VD-CC-轧制"的冶炼工艺对齿轮钢生产过程取样分析, 采用扫描电镜对不同阶段的夹杂物成分、尺寸、形貌和数量等特性进行系统分析研究。结果表明, 在转炉冶炼结束后, 在CAS精炼结束之前, 钢中只有Al2O3夹杂, 且呈团簇状存在; 在LF造白渣5 min时, 加入钙线进行钙处理, 促进夹杂物的形态改变, 形成了Al2O3、Al2O3-CaO以及Al2O3-MgO夹杂; 在LF出站时, 已经结合成为球状的Al2O3-MgO-CaO、CaS-MnS类的复合夹杂和TiN夹杂; 在中包位置时, 除了球状的Al2O3-MgO-CaO复合夹杂和CaS夹杂, 还出现了小尺寸氧化物夹杂。

     

    Abstract: To clarify the evolution behavior of nonmetallic inclusions in gear steel in the whole process, achieve effective control of the characteristics of inclusions in steel and improve product quality, 20CrMnTiH gear steel was taken as the research object. It was sampled in the "BOF-CAS-LF-VD-CC-rolling" smelting process, and SEM was used to systematically analyze and study the composition, size, morphology and quantity of its inclusions at different stages. The results showed that after the converter smelting and before the CAS refining, there were only Al2O3 inclusions in clusters in the steel. When the LF white slag was produced for 5 min, calcium wire was added for Ca treatment, which promoted the morphological change of the inclusions, forming Al2O3, Al2O3-CaO inclusions and Al2O3-MgO inclusions. When the LF exited the station, it had been combined into spherical Al2O3-MgO-CaO and CaS-MnS composite inclusions and TiN inclusions. When in the middle package position, in addition to spherical Al2O3-MgO-CaO composite inclusions and CaS inclusions, there were also fine and small-sized oxidized inclusions.

     

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