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2. 发明授权

US4178173A Process for producing stainless steels 失效
标题翻译：生产不锈钢的工艺
公开(公告)号：US4178173A
公开(公告)日：1979-12-11
申请号：US932598
申请日：1978-08-10
申请人： Helmut Gorges , Heinrich Brod , Wilfried Pulvermacher , Wolfgang Rubens , Otto Fischer
发明人： Helmut Gorges , Heinrich Brod , Wilfried Pulvermacher , Wolfgang Rubens , Otto Fischer
IPC分类号： C21C5/30 , C21C5/00 , C21C5/28 , C21C5/35 , C21C5/48 , C21C5/32 , C21C5/34
CPC分类号： C21C5/35 , C21C5/005
摘要： Disclosed herein is an improvement in a process for preparing a stainless steel of low carbon content from a steel melt containing chromium or chromium nickel of higher carbon content where the process is carried out in a converter having at least one blast nozzle below the molten steel bath level and at least one blast lance above the bath level wherein oxygen is supplied to the steel melt through the blast lance and inert gas is supplied through the blast nozzle during a first refining phase, and in a succeeding refining phase oxygen is combined with inert gas and introduced through the blast nozzles to the steel melt, the proportion of the oxygen being reduced in relationship to the proportion of inert gas with decreasing carbon content of the steel melt. The improvement of the invention permits a decrease in the amount of inert gas supplied during the first refining phase while not significantly increasing the refining time. The improvement resides in employing as at least one of the nozzles one having an axially movable bar within the passageway of the nozzle, the bar being extended through the nozzle passageway to the mouth of the nozzle during the first refining phase and being withdrawn from the mouth of the nozzle during the successive refining phase. By such an expedient, the amount of gas passing through the nozzle in the first refining phase is reduced, and the amount of gas passing through the nozzle in the successive refining phase is increased.
摘要翻译：本文公开了一种用于从含有较高碳含量的铬或铬镍的钢熔体制备低碳含量的不锈钢的方法的改进，其中该方法在具有在钢水浴下方的至少一个鼓风喷嘴的转炉中进行并且在第一精炼阶段通过鼓风喷嘴将惰性气体供给到钢熔体中，并且在随后的精炼阶段中，将氧与惰性气体并通过鼓风喷嘴引入钢熔体，氧气的比例与钢熔体中碳含量降低的惰性气体的比例有关。本发明的改进允许在第一精炼阶段期间供应的惰性气体的量减少，而不会显着提高精炼时间。改进在于采用至少一个喷嘴，其中一个在喷嘴的通道内具有可轴向移动的杆，该杆在第一精炼阶段期间通过喷嘴通道延伸到喷嘴的口部并且从嘴中取出在连续精炼阶段期间的喷嘴。通过这样的方式，在第一精炼阶段中通过喷嘴的气体的量减少，并且在连续精炼阶段中通过喷嘴的气体量增加。

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