Wheel steel products of Han Steel occurred welding cracking when using in a wheel factory, by analyzing the crack in the wheel steel weld cracking with microstructure analysis and spectrum analysis, test results showed the grain in heat affect zone serious grow, and the user at the end of the flash-butt quenched from a high temperature to room temperature at welding seam, larger cooling rate to generate sufficiently large quenching stress, increased the risk of cracking along the grain boundary. When the stress reaches a certain level, there will be a greater area of the grain cracks at the location of welding seam, eventually leading to weld cracking. We develop measures for improvement to solving this problem, we suggest that the cooling mode at welding seam should be slow cooling or air cooling after the rim welding process, welding current range is 7800 ~ 9500 amps, upsetting time is 0.2 seconds, these measures can improve the welding quality of wheel steel products and reduce the risk of welding cracks.
This article provides an overview of the Kivcet technique in Jiangxi Copper Corporation,reviews the production status and problems encountered in the past decade,introduces its technological advantages and prospect.It is believed that the Kivcet process has advantages such as strong adaptability to raw materials,stable operation,high metal recovery rate,and low cost of zinc leaching residue treatment,which is the vitality of lead-zinc smelting enterprises in the future.
京唐公司1580热轧蓄热式加热炉均采用复合绝热耐火材料结构,该结构在使用期间均存在不同位置的耐火材料损坏现象,针对此现象进行了深入分析,并采取合理的预防措施,同时根据生产实践,从设计、施工、烘炉、维修等方面对蓄热式加热炉耐火材料的技术管理进行了探讨.
在追求高炉长周期稳定顺行和低成本冶炼过程中,高炉面临使用原燃料品种较多、质量下降、粉末较大的问题,在尝试炉内大矿批、高冶炼强度下,原燃料筛分效果好坏直接关系炉况稳定性和指标推进."粗料精吃"除需合理搭配原料性能外,入炉筛分管控成为重点,加强原燃料管理、减少入炉粉末、提高振筛效率、降低入炉原燃料粉末,保障入炉原燃料品质,是保证高炉炉况稳定顺行基础;同时,为减少不必要的浪费,控制返矿粒度合理,做到"精料细吃"同样也是推动低成本冶炼的关键环节.通过对平衡入炉筛分和控制合理的返矿粒度进行探索研究,取得了一定成效,为高炉长期稳定顺行、产能提升、指标进步、生铁成本降低奠定了基础.
在生产冷轧镀锌线生产过程中,会因原料问题导致退火炉内带钢跑偏而引发停车.基在此,以连续镀锌线设备为研究主体,分析设备的具体运行情况,探究在镀锌线生产期间炉内带钢跑偏管理存在的问题,并提出改进对策,确保产线稳定运行.
