(1) This investigation is concerning to the spark decrement of the 18-4-1 type high speed steel by the addition of cobalt, which are studied by powder spark test.
(2) The cause of the spear point phenomena, which appears in the molybdenum and vanadium bearing steels are discussed.
(3) Some investigations on the spark of molten pig and molten steel are too described.
抄録全体を表示