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本文粗浅地探讨了锰在低碳沸腾钢凝固过程中对 CO 气体析出与钢锭结构形成的影响及其机理。Mn 是弱脱氧剂,不控制钢液中〔O〕含量,但在凝固过程中起着脱氧作用,对 CO 气体析出、钢锭结构形成有着极为重要的影响。研究沸腾钢凝固现象应该以 Fe-C-Mn-O 四元系为依据,建立 C-Mn-O 平衡关系,充分注意 Mn 的影响与作用。Mn 对铜锭外侧坚壳带的形成及其厚度有着决定性的影响。降低〔Mn〕含量,则可增加 C-O 反应的〔O〕量,使由〔C〕控制的沸腾带深度 h_C增加,由〔Mn〕控制的脱氧带深度 h_(Mn)降低,铜液在模内沸腾作用强烈。结果是钢锭上半部管状气泡不发生带高度 h_0增加,坚壳带厚度 D_S 增厚,可以得到健全的沸腾钢锭,并为实行快速上注创造条件。对超低碳沸腾钢(C≤0.07%)采用高〔C〕低〔Mn〕化方法生产,可有效地防止针状气泡的发生,改善表面质量。
In this paper, the influence and mechanism of CO gas evolution and ingot structure formation during the solidification of low-carbon steel are briefly discussed. Mn is a weak deoxidizer, does not control the content of [O] in the molten steel, but plays a role of deoxidation in the solidification process. It has a very important influence on the formation of the ingot structure due to the evolution of CO gas. Study of boiling steel solidification should be Fe-C-Mn-O quaternary as the basis, the establishment of C-Mn-O equilibrium relationship, full attention to the impact of Mn and role. Mn has a decisive influence on the formation and thickness of the outer shell of copper ingots. Reducing the content of [Mn] increases the amount of [O] in the CO reaction and increases the depth of boiling zone h_C controlled by [C]. The depth of deoxygenation zone h_ (Mn) controlled by [Mn] decreases. Strong boiling effect. The result is that the upper half of the ingot tubular bubble does not occur with a high degree of h_0 increase, solid shell thickness D_S thickening, you can get a healthy boiling ingot, and to create conditions for the rapid betting. Low carbon boiled steel (C ≤ 0.07%) using high 〔〕 〔C〕 〔〕 〔〕 production of the method can effectively prevent the occurrence of acicular bubbles to improve the surface quality.