Patent ID: 7722727

Claim:
Hot worked steel for plastic molding essentially void of primary carbides, having been subjected to austenitizing at 950-1025° C. and hardening and high temperature tempering at 500-570° C., having a hardness of 54-59 HRC and an impact toughness in transverse direction greater than or equal to 80 J, comprising the following chemical composition in weight-%: 0.41-0.60 C; from traces to 0.5 Si; from traces to 0.5=(Si+Al); 0.1-2.0 Mn; 3.0-5.5 Cr; 1.5-3.1=(Mo+W/2), however max. 1.0 W and max. 2.6 Mo; 0.30-0.70 V; max. 0.1 of each of Nb, Ti and Zr; max. 2.0 Co; max. 2.0 Ni; and balance essentially only iron and unavoidable impurities.