RARE EARTH METALS-NICKEL AND BARIUM-COPPER MOTHER ALLOYS, AND MANUFACTUREING METHOD OF STAINLESS STEELS WITH USED THESE ALLOYS

摘要

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. 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.