Fully martensitic steel for a metal mold for molding glass and the metal mold

摘要

A steel which consists essentially of 0.25-0.65% of C, up to 2. 50% of Si, up to 2.00% of Mn, 10.00-20.00% of Cr, 4.00-13.00% of Co, 1.00- 3.00% of Al, up to 0.25% of N and the balance essentially Fe and ordinary impurities and satisfies the relation: ##EQU1## provides a metal mold which need not be Cr-plated and is suitable of use in molding high- quality glass wares.