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三真空提升法(DH 法)和循环脱气法(RH 法)DH 和 RH 法是西德分别于1956年和1959年研究发明的。这两种方法具有下列优点:(1)真空室在处理前可以予热,真空处理时,可用电极加热,故钢液的温降小。(2)处理过程中可加入大量合金,同时可以比较精确地调整钢液成份。(3)处理后钢液的成份和温度均匀。(4)具备脱气与精炼所需的良好的动力学条件,因而脱气效果好。(5)能处理
Three vacuum lifting method (DH method) and cycle degassing method (RH method) DH and RH method is the West Germany in 1956 and 1959, respectively, invented. These two methods have the following advantages: (1) The vacuum chamber can be preheated before the treatment, vacuum treatment, the electrode can be heated, so the liquid steel temperature drop. (2) a large number of alloys can be added during the treatment, and the liquid steel composition can be adjusted more accurately. (3) The composition and temperature of molten steel after treatment are even. (4) Good degassing and refining required kinetic conditions, and therefore good degassing effect. (5) can handle