Abstract
1. The results of end-quench hardenability tests cannot be used to calculate the critical diameter with quenching from temperatures in the intercritical range. 2. With quenching from temperatures in the intercritical range the hardenability of steels can be determined by bulk quenching with comparison of the data for other steels or by comparing the results of quenching from temperatures above Ac3. 3. With heating above and below Ac3 the hardenability of steel 18KhGNMFL is higher than that of steel 18KhN2MFL. After quenching from 900° it is possible to obtain even properties in steel 18KhGNMFL in a section 80 mm in diameter, and even properties in steel 18KhN2MFL in a section 40 mm in diameter. Deep hardenability is obtained in a section 60 mm in diameter after quenching of steel 18KhGNMFL from 790° (i.e., for carburized parts). The properties of steel 18KhN2MFL at the surface and in the center of the section differ sharply even in the section 20 mm in diameter, and therefore quenching from 790° can be used for this steel only in the case where higher mechanical properties are not required.
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