共查询到19条相似文献,搜索用时 140 毫秒
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连铸含铌钢板坯表面横裂纹原因分析和措施 总被引:3,自引:0,他引:3
通过对邯钢三炼钢厂板坯连铸生产高强度船板用等铌微合金钢,铸坯发生表面横裂纹的机理分析,讨论了铸坯表面横裂纹产生的影响因素,并提出了连铸解决含铌钢表面横裂纹的有效措施。 相似文献
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铌钒钛微合金钢连铸坯表面裂纹 总被引:1,自引:0,他引:1
采用多种分析手段,对武钢大生产中的几种铌钒钛微合金钢连铸坯表面裂纹的形成原因及影响因素进行了深入研究。并根据研究结果在生产中采取相应对策,使连铸坯表面质量得到改善。同时还在铸坯试样上预制不同深度的表面裂纹,通过模拟轧制试验,探讨了连铸坯表面裂纹对中厚板表面质量的影响。 相似文献
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为了从凝固及相变特性角度解决微合金钢连铸坯表面裂纹问题,建立了与合金化相关联的初始凝固包晶反应度模型、奥氏体晶粒长大模型、铁素体转变量模型以及碳氮化物的析出模型。结合铸坯实际冷却条件,进一步建立了包晶反应度预测、初生奥氏体晶粒长大、铁素体转变、析出相析出等对铸坯表面裂纹敏感性的预测模型。针对某J55钢连铸板坯,奥氏体晶粒尺寸超过1 mm、铁素体析出量为10%、二次相析出量增加时,横裂纹敏感性最大。表面裂纹敏感性预测模型有助于实现基于成分微调和组织调控的微合金钢连铸、热装等生产过程表面裂纹控制技术。 相似文献
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连铸板坯表面纵向裂纹的形成原因 总被引:5,自引:0,他引:5
对连铸板坯表面纵向裂纹的形成原因进行了分析研究,发现浸入式水口在浇注过程中损坏和结晶器保护渣性能不佳是主要因素。采取了相应的改进措施后,钢板表面线状缺陷的发生率大幅度降低。 相似文献
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通过对高碳钢的检验,分析了高碳钢连轧坯表面缺陷的类型和产生原因,主要有表面划伤和皮下气孔轧后缺陷两种类型。研究发现,连轧过程导板或导辊等设备有“挂腊”现象、连轧辊存在表面磨损等缺陷是造成连轧坯表面划伤的原因,连轧坯的皮下气孔轧后缺陷是由于连铸坯的皮下气孔缺陷引起的。在高碳钢钢坯连轧前必须对连轧设备的工作状态进行检查,防止连轧坯表面划伤的产生。减轻连铸过程水口吹氩流量是减轻连铸坯皮下气孔缺陷的一种措施,但减少吹氩量对连铸过程活跃保护渣层是不利的。建议在连铸过程进行结晶器电磁搅拌,以减轻连轧大方坯皮下气孔缺陷,提高连轧坯表面质量。 相似文献
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Strategies based on thermodynamic calculations can be used to overcome the problems associated with oxides encountered in steel plant operations, which can lead to certain difficulties in the process such as clogging of submerged entry nozzle during continuous casting. Approaches to producing high alloy steels by continuous casting have been taken. One of the strategies to avoid the oxidation of chromium is to add a small amount of other elements (subject to other constraints), which do not cause subsequent problems. The problem has been studied using the Thermo-CalcR software, with related databases; and the results obtained for different process conditions or generic com-positions have been presented. 相似文献
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《钢铁冶炼》2013,40(6):506-512
AbstractDeposition of alumina inclusions inside the submerge entry nozzle is a long standing problem in continuous casting of aluminium killed steel. Clogging of the casting nozzle severely affects productivity and also causes degradation of product quality. Unfortunately, very few numerical tools are available for precise quantification of the magnitude of clogging. Tools for quantifying the extent of clogging were developed during the present work and have been integrated with the control system of a running continuous slab casting shop. Reasonable match has been observed between the estimation from the developed program and the actual observations in the casting shop and subsequent products. In addition to process control, the tools were also found useful for comparing the castability of different steel grades. This feature has been utilised to study nozzle clogging during casting of steel grades that are commonly believed to have poor castability. 相似文献
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通过对10Cr21Mn16NiN高氮不锈钢冶炼和连铸工艺研究,在生产中改进两步法冶炼和连铸生产工艺,与三步法工艺相比,LF精炼后期增氮速度由5×10-6~10×10-6/min提高到20×10-6~30×10-6/min,LF精炼时间由390 min缩短至240 min,连铸等钢时间由4 h降至2 h以下;解决了钢包增氮炉渣外溢的问题;避免了方坯在连铸过程中的翘头,No.1、No.2流断浇率由开发时100%降至0,设备事故率由66.7%降至0,2炉连浇率实现100%。实践证明,方坯连铸机辊子非密排且仅有1台五辊拉矫机也能生产出高强不锈钢方坯。 相似文献
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