RARE EARTH METALS-NICKEL AND BARIUM-COPPER MOTHER ALLOYS, AND MANUFACTUREING METHOD OF STAINLESS ST

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PURPOSE : To provide rare earth and barium mother alloys which have high recovery ratio compared with MM and Ca-Si, show beneficial effect on deoxidation, desulfurization and hot workability of the MM and Ca-Si, prevent casting crack by lowering production rate of intermetallic phases having high brittleness during casting and reduce dust and gas, and a manufacturing method of stainless steel using the same. CONSTITUTION : The rare earth-based nickel mother alloy comprises 10 to 54 wt.% of MM, and the balance consisting of nickel(Ni) and inevitable impurities. The barium-based copper mother alloy comprises 3.0 to 25 wt.% of barium(Ba), and the balance consisting of copper(Cu) and inevitable impurities. The manufacturing method of stainless steel is characterized in that a rare earth-based nickel mother alloy, a barium-based copper mother alloy or a combination thereof is added to molten stainless steel. © KIPO 2005