HIGH ABRASION RESISTANT AND HIGHLY TOUGH COLD WORKING TOOL STEEL

摘要

PURPOSE:To obtain an iron base high C, high Cr, high Fe type martensite cold working tool steel that is excellent in abrasion resistance and high in toughness, by incorporating C, Cr, V, Mo, Si and Mn in a prescribed proportion. CONSTITUTION:The high abrasion resistant and highly tough cold working tool steel consists of 2.0-4.0wt% C, 7.0-17.1wt% Cr, 6.0-14.0wt% V, 0.5-3.0wt% Mo, 2.0wt% or less Mn and the balance of Fe and impurities. This tool steel possesses advantages like a conventional high Cr type material as well as the conventional high V type material. That is, by adding 5% or more V to a high C and high Cr material, the Cr type carbide that crystallizes when it is cast is allowed to crystallize as particles, and as a result the toughness is greatly improved. Further, the carbon and the carbide forming elements are suitably kept balanced on the one hand to improve the abrasion resistance greatly and on the other hand to minimize the lowering of the toughness.