Abstract
During and after the war, great attention has been directed to the high carbon and high vanadium types on the high speed steel. These types of high speed steel offer advantages because of their greatly increased resistance to wear, but little has been reported on the detailed relations between their compositions and their properties. It is the object of this survey to elucidate these relations in this new type of high speed steel. For this purpose, laboratory tests on heat treatment, hot hardness, impact properties and cutting power have been carried out. The carbon and vanadium contents being higher than normal, resulting in a decreased amount of matrix carbon and in an increased amount of complex carbide, they are easy to forge and heat treat. And as a result of this experiment, specimens containing 1.4%C, 5∼10%W, 4%Cr, 5.5%V have been found to have the highest properties as tool steel, especially for fine drills.
