圆坯连铸工艺参数对铸坯凝固的影响与分析.doc

圆坯连铸工艺参数对铸坯凝固的影响与分析 孙向东 朱立光 朱新华 (河北联合大学冶金与能源学院，河北，唐山 063009) 摘 要：连铸是钢铁工业的重要环节，由于其生产条件的特殊性，有些数据很难从现场直接获取。经验值难以准确判断现场铸坯凝固变化规律，与理论存在偏差，则可能造成铸坯质量的下降。本研究在ANSYS的基础上，针对钢种37Mn5，铸坯断面Ф210mm建立传热模型。通过模拟实验，考虑了铸机拉速，过热度，冷却强度在铸坯凝固传热过程中对其表面温度，凝固坯壳厚度，凝固终点位置的影响，并分析其对铸坯质量产生的影响，从而为现场生产提供理论指导，实现连铸机的高效、优质生产。 关键词：圆坯连铸；传热模型；冷却强度；过热度；裂纹 Analysis about Technological Parameter of Round Billet Continuous Casting on the Influence of Strand Solidification Sun Xiangdong Zhu Liguang Zhu Xinhua (College of Metallurgy and Energy Hebei United University Tangshan 063009 Hebei China) Abstract: continuous casting is an important part of the iron and steel industry, due to the particularity of its production conditions, some data were difficult to be directly obtained from the site. The value of experience can not exact judge shifty regular pattern of strand solidification in site, it should exist deviation with theory, maybe result in the quality of strand declined. Therefore, this study based on ANSYS, we will build the heat transfer mode about the steel of 37Mn5 and the section of Ф210mm. Through simulation experiments, considering the casting machine speed, degree of superheat and cooling intensity on the influence of slab solidification and heat transfer, analyzes its the surface temperature of slab, slab solidification shell thickness and solidification end point, and analyze its impact on casting quality, so as to provide theoretical guidance for practical production, achieve continuous caster efficient, superior quality of castings production. Key words：Round billet continuous casting, The heat transfer model, Cooling intensity, Degree of superheat, The crack 1 前言 连铸工艺在钢铁冶金中的地位超乎其前，由于连铸机的使用，大大提高了金属的收得率，降低了成本，也增加了钢材产量。随着连铸技术的日益发展，钢材产量已经不是焦点，如何生产出高质量的铸坯却越发被生产企业所关注。37Mn5钢属于合金结构钢，它主要用于石油化工行业，因此，钢种质量的优劣性就决定着它在石油化工行业的使用寿命。由于37Mn5钢是裂纹敏感钢种，在生产中极易出现裂纹，从而影响终产品的质量。天钢联合特钢生产圆坯规格为Ф210mm，Ф270mm，Ф300mm，Ф350mm。针对37Mn5钢出现裂纹的情况，为了更全面的了解铸坯凝固过程，本研究建立了Ф210mm断面的铸坯凝固传热模型。以期通过应用该模型，在改变工艺参数的条件下，获得铸坯表面温度，坯壳厚度，凝固终点位置随工