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Soft free-cutting steel contg. large sulphide inclusions - where controlled deoxidation of molten steel in ladle ensures good surface finish during machining
Soft free-cutting steel contg. large sulphide inclusions - where controlled deoxidation of molten steel in ladle ensures good surface finish during machining
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机译：易切削的软钢。大型硫化物夹杂物-钢包中钢水的受控脱氧可确保加工过程中良好的表面光洁度
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摘要
The inclusions have the shape of a lens, but the semi-finished prods. machined from the steel have a good surface finish obtd. by measuring the oxygen content of the molten steel in the ladle and then injecting a deoxidant to reduce the oxygen to teh deisred percentage. The oxygen content of the molten steel is pref. measured via electromotive force; and the dissolved oxygen in the melt is pref. reduced to 30-130 ppm, esp. 40-60 ppm, prior to casting. The pref. deoxidant is Al or its alloys; and deoxidn. is pref. controlled via the equation log(O) = -20600/T + A; where (O) is the dissolved O2 in ppm before casting: T is the steel temp. in degree K; and A is a function of the initial O2 content and the type and amt. of deoxidant used plus the injection time. A good surface finish can be obtd. despite the presence of numerous large sulphide inclusions in the steel.
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机译：夹杂物具有晶状体，但刺末为半成品。由钢加工而成的表面光洁度好。通过测量钢包中钢水的氧气含量，然后注入脱氧剂将氧气还原至所需的百分比。钢水的氧含量是优选的。通过电动势测量;并且熔体中的溶解氧是优选的。降低到30-130 ppm，尤其是铸造前40-60 ppm。偏好。脱氧剂是Al或其合金;和脱氧。是首选。通过等式log（O）= -20600 / T + A进行控制;其中（O）是铸造前溶解的O2（ppm）：T是钢的温度。在K度; A是初始氧气含量，类型和含量的函数。使用的脱氧剂加上注射时间。可以保持良好的表面光洁度。尽管钢中存在大量的大型硫化物夹杂物。
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