Method for manufacturing steel article having high toughness and high strength.

摘要

A method for manufacturing a steel article having a high toughness and a high strength, which comprises the steps of: using a material comprising: <TABLE> where the total amount of manganese and chromium being from 2.50 to 6.00 wt.%, <TABLE> and the balance being iron and incidental impurities, where, the amount of nitrogen as one of the incidental impurities being up to 0.006 wt.%; heating the material to the austenization temperature region; hot-working the material in the austenization temperature region to prepare a steel article; and cooling the steel article thus prepared from the austenization temperature region to a temperature of or lower than 300 DEG C at a cooling rate of from 2 to 100 DEG C/second, thereby imparting a high toughness and a high strength to the steel article.