Selection of optimum quenching temperatures for some tooled steels

Abstract

1. Heavy-load cold-worked tools must be quenched so as to produce primary hardness (Table 1). 2. The size of the actual austenite grain coupled with hardness can be used as a criterion for the quality of the heat treatment of tool steels. The grain size must be determined with a magnification of 500. 3. It is advisable to amend and add a further section to the GOST 5639-51 State Standards on detection of the true austenite grain boundaries in steels which have a martensite structure after quenching.