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川崎钢锭公司水岛工厂使用碱性氧气顶吹转炉(BOF)、RH脱气及大钢锭底注的联合方法,制出重达200t的锻造用大钢锭。比起通常用电炉生产的方法,本法具有下列优点:1)通过选用铁水,可使钢中有害元素如砷、锑、锡等降低到极小含量。这对生产核反应容器用钢也是很有利的。2)由于采用铁水脱硫及在碱性氧气顶吹转炉中钢水脱磷的先进技术,可使钢中硫和磷的含量分别控制在0.006％以下及0.002％以下。3)由于采用BOF吹氧、RH快速脱气及在浇铸时防止吸收氢气的改进技术,可使锭模中钢水的氢含量平均维持在0.9ppm的水平。4)特殊摸计的底注方法可保证稳定地浇出氢含量、夹杂物和表面状态都令人满意的、重达200t的钢锭。
The Kawasaki Steel ingot company Mizushima Plant used a combination of basic oxygen top blowing converter (BOF), RH degassing and large ingot bottom injection to produce large forged ingots weighing up to 200 tons. This method has the following advantages compared to the methods commonly used in electric furnaces: 1) By using hot metal, harmful elements such as arsenic, antimony and tin in the steel can be reduced to a minimum. This is also very beneficial for the production of steel for nuclear reactor vessels. 2) Due to the advanced technology of hot metal desulphurization and dephosphorization of molten steel in the basic oxygen top-blown converter, the contents of sulfur and phosphorus in the steel can be controlled below 0.006% and below 0.002% respectively. 3) Due to the improved technology of BOF blowing oxygen, rapid degassing of RH and preventing hydrogen absorption during casting, the hydrogen content of the molten steel in the ingot mold can be maintained at an average level of 0.9ppm. 4) The special footprints of the method of betting to ensure a steady pouring hydrogen content, inclusions and surface conditions are satisfactory, weighing up to 200t ingot.