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1. 发明专利

JPS58181817A Manufacture of low-phosphorus al-killed steel 失效
标题翻译：低磷杀死钢的制造
公开(公告)号：JPS58181817A
公开(公告)日：1983-10-24
申请号：JP6448282
申请日：1982-04-16
申请人： Sumitomo Metal Ind Ltd
发明人： AOKI NOBUHIDE , YAMAZAKI ISAO , HIRATA TAKEYUKI , OOKITA YOSHIMICHI
IPC分类号： C21C7/00 , C21C7/06
CPC分类号： C21C7/06
摘要： PURPOSE:To extremely efficiently manufacture high-grade low-phosphorus Al-killed steel, by smelting pig iron melt together with necessary adjutant raw materials into a state having low C content with upper-blown oxygen and bottom-blown gas, vacuum degasifying the formed steel to deoxidize and decarburize it, adding Al to it, and then continuously casting it. CONSTITUTION:Pig iron melt tgether with necessary adjutant raw materials is bottom- blown with gas during and/or after being refined with upper-blown O2 in the converter furnace which enables the upper blowing of O2 and the bottom blowing of gas to make steel of [C] below 0.07%, and the resulting steel melt is tapped under an undeoxidized condition. The undeoxidized tapped steel melt is then treated in a vacuum degasifier to perform decarburization, deoxidation and the adjustment of necessary components. From the time when [C] comes close to an objective value with the progress of the decarburizing reaction of C+O CO in the vacuum degasifier, Al is added in installments to reduce [O] down to about 0.002-0.005%. Thereafter, the steel melt after being treated in this way is formed into a cast piece of predetermined size by a continuous casting process. The formation of Al2O3 clusters is little in this continuous cast piece, and said cast piece is a low-phosphorus Al-killed one extremely excellent in quality as compared with a conventional Al-killed cast steel piece.
摘要翻译：目的：为了极高效地制造高品位低磷铝杀死钢，通过将生铁与必要的副原料一起熔炼成具有较低C含量的上吹氧气和底吹气体的状态，真空脱气形成钢对其进行脱氧和脱碳，向其中加入Al，然后连续铸造。构成：在转炉炉内用上吹的O2进行精炼期间和/或之后，与必要的副原料一起生产的铁水熔化，使得上吹O2和气体的底吹使钢 [℃]低于0.07％，所得钢熔体在未脱氧条件下攻丝。然后在真空脱气器中处理未脱氧的螺纹钢熔体，以进行脱碳，脱氧和必要组分的调整。随着C + O CO在真空脱气装置中脱碳反应的进行，[C]接近目标值时，分批加入Al，将[O]还原为约0.002〜0.005％。此后，以这种方式处理后的钢熔体通过连续铸造工艺形成预定尺寸的铸件。在该连续铸件中，Al 2 O 3簇的形成很少，并且所述铸件是与常规Al-杀死的铸钢件相比质量极好的低磷Al杀死的一种。

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