含硫齿轮钢凝固冷却过程中非金属夹杂物的转变研究

炼钢

含硫齿轮钢凝固冷却过程中非金属夹杂物的转变研究

张明海1，程礼梅2，杨文2，李学科1，于春强1，牛凯军2

(1.河钢集团宣钢公司，河北张家口 075100； 2. 北京科技大学冶金与生态工程学院，北京 100083)

接受日期:1900-01-01 出版日期:2020-02-05

Study on transformation of non-metallic inclusions in sulfurbearing gear steel during solidification and cooling process

Accepted:1900-01-01 Online:2020-02-05

摘要/Abstract

摘要： 钢中非金属夹杂物对钢的性能有很大的影响。在连铸过程中，随着温度的降低，钢液冷却凝固，钢与夹杂物之间的热力学平衡发生移动，从而导致夹杂物平均成分的转变。因此，研究钢液凝固和冷却过程中夹杂物的转变是有意义的。以20CrMnTiH含硫齿轮钢为研究对象，用热力学和工厂试验研究了钢液凝固和冷却过程中夹杂物的演变。结果表明，中间包钢样和连铸坯中夹杂物都以Al2O3-Ti2O3-MgO-CaO-CaS型夹杂物为主，但连铸坯中夹杂物中CaO含量明显低于CaS含量。这与凝固冷却过程的热力学计算得出的CaO夹杂物的转变规律一致。但由于热力学和动力学条件的不足，计算得出的夹杂物平均成分与实际检测值仍存在一定差异。

关键词: 含硫齿轮钢, 夹杂物转变, 凝固冷却

Abstract: Non-metallic inclusions in steel have a great influence on the properties of steel. In the continuous casting process, as the temperature decreases, the molten steel cools and solidifies, and the thermodynamic equilibrium between the steel and the inclusions moves, resulting in a change in the average composition of the inclusions. Therefore, it is meaningful to study the transformation of inclusions during solidification and cooling of molten steel. In this paper, 20CrMnTiH sulfur-containing gear steel was studied, and the evolution of inclusions during solidification and cooling of molten steel was studied by thermodynamics and factory experiments. The results show that the inclusions in the tundish steel and the continuous casting billet are mainly Al2O3-Ti2O3-MgO-CaO-CaS inclusions, but the CaO in the inclusions in the continuous casting billet is significantly lower than the CaS content. This is consistent with the thermodynamic calculation of the solidification cooling process and the conversion law of CaO inclusions. However, due to the limit of thermodynamic and kinetic conditions, the calculated average composition of inclusions and the actual detection values still have some differences.

Key words: sulfur-containing gear steel, inclusion transformation, solidification cooling

张明海1，程礼梅2，杨文2，李学科1，于春强1，牛凯军2. 含硫齿轮钢凝固冷却过程中非金属夹杂物的转变研究 [J]. 炼钢.

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