COLD TOOL STEEL HAVING CONSTANT DEFORMATION ON TREATMENT AND METHOD FOR PRODUCING COLD TOOL USING THE STEEL

摘要

PROBLEM TO BE SOLVED: To provide a cold tool steel which has a constant deformation on heat treatment, does not require finish working for removing the formation after quenching and has hardness of ≥55 HRC required as a die.;SOLUTION: The cold tool steel has a composition consisting of, by weight, 0.4 to 1.2% C, 0.1 to 1.2% Si, 0.3 to 2.0% Mn, 3.0 to 10.0% Cr and 0.5 to 3.0% Mo, and the balance substantially Fe. The composition is controlled so that pearlite nose is shorter than 250 min, and hardness is ≥55 HRC at the cooling rate of 2 to 50°C/min in quenching by gas cooling.;COPYRIGHT: (C)2002,JPO