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1971年4月“得克萨斯厂”,就在连铸机上开始生产用于轧制厚板的板坯。起初是用敞流的方式把钢水送入结晶器内浇铸硅脱氧的碳素钢板坯。通过采用保护渣和浸入式水口所进行的浇注工艺的改进使之可能浇注用铝和硅脱氧的钢种。当前这样的钢种在连铸机生产中的比例占了65％强。在连铸机上铸出高质量的板坯使之可能实现连铸板坯的90％勿需进行清理而直接装入轧机的加热炉。所剩10％板坯的清理工作量也低于10％。板坯的内裂缺陷很少见,这可用板坯内应力的减少来解释。连铸机生产线上出现的情况由负载传感器进行连续检测。由于生产的板坯质量高,大家都很乐意向他们定货。“美国钢铁公司别伊墩厂”的电弧炉与连铸机的配套设备于1971年4月投入运行。该厂是“美国钢铁公司”的第一个完全定为连铸而没有模铸的工厂。投产开始之际,该厂的全部设备均为新遣的设备。绝大数职工都具有连铸的熟练技巧,且力争消除模铸。当前,该厂职工正在准备生产用于生产厚板的优质板坯。在五年多的过程中,对生产设备、炼钢和连铸工艺都进行了相应地改变,从而使得能够达到整套设备的预定生产能力而且钢的质量良好。这些成绩已经在完成包括用于结构钢板,高压容器钢板、造船钢板和干线管材钢板广泛品种的定货中体现了出来。在连铸机上铸出的全部板坯都在高生产能力的4000轧机上轧制。由于轧机的生产能力大于“得克萨斯厂”的连铸机的生产能力,在该轧机上还轧制“美国钢铁公司”其他钢厂提供的普通初轧板坯。但是由于轧机具有高的生产能力和对连铸板坯有较高的质量要求(在电弧炉—连铸机配套中才能达到),目前该厂新建一批电炉和连铸机。新建设备可使轧机产量提高两倍,从而使初轧板坯供给量减少到最低限度。本文对连铸机作以描述,并报告包括质量问题及其解决的方法等工艺上的难题,且对目前正在该厂建造的新炼钢设备及连铸机作以简要说明。
In April 1971, “Texas Plant,” began producing slabs for rolling slabs on the caster. At first, the molten steel was poured into the mold by casting steel to deoxidize the carbon steel slab. The improvements in the casting process by using mold flux and immersion nozzles make it possible to cast steel grades deoxidized with aluminum and silicon. The current proportion of such steels in the production of continuous caster accounted for 65% strong. Casting a high quality slab on a continuous casting machine makes it possible to achieve 90% of the continuous casting slab into the furnace of the rolling mill without cleaning. The remaining 10% slab cleaning workload is also less than 10%. Slab internal crack defects are rare, which can be used to explain the reduction of slab stress. Occurred in the continuous casting machine production line by the load cell for continuous testing. Due to the high quality of the slab produced, everyone is happy to order from them. The equipment for electric arc furnace and continuous caster at “US Steel Doyle Pier Plant” was put into operation in April 1971. The plant was the first plant in the United States Steel Company to be completely continuous casting without molding. The beginning of production, the plant all the equipment are newly removed equipment. The vast majority of workers have the skills of continuous casting, and strive to eliminate mold. At present, the factory workers are preparing for the production of high-quality slab for the production of thick slab. Over a five-year period, production equipment, steelmaking and continuous casting processes have all been changed to enable the planned production capacity of the complete plant to be achieved and the quality of the steel to be good. These achievements have been reflected in the fulfillment of orders including a wide variety of structural steel plates, high pressure vessel plates, shipbuilding plates and trunk pipe sheets. All the slabs cast on the caster are rolled on the high capacity 4000 rolling mill. Because of the mill’s capacity to produce more than the production capacity of the Texas Plant’s caster, the mill also rolled ordinary bloom slabs from other US Steel mills. However, due to its high production capacity and high quality requirements for continuous casting slabs, which can be achieved in the EAF-CCM plant, a number of new electric furnaces and continuous caster machines are currently being built. The new plant will double the mill’s output and reduce the supply of slab to a minimum. This article describes the continuous casting machine and reports on process issues, including quality issues and how they are solved, as well as a brief description of the new steelmaking equipment and continuous casting machines currently being built at the plant.