Process for producing nickel steels with high crack-arresting capability

摘要

A process for producing a Ni-steel with high crack-arresting capability is disclosed. The process comprises the steps of: heating a steel material containing 2.0-10% of Ni to a temperature between 900 and 1,000 DEG C.; hot rolling the steel material to provide a cummulative reduction of 40-70% at 850 DEG C. or below, and finishing the rolling operation at 700 DEG -800 DEG C.; immediately after completion of the rolling step, quenching the steel material to a temperature not higher than 300 DEG C.; and subsequently tempering the quenched slab at a temperture not higher than the Ac1 point.