FOERFARANDE FOER HAERDNING AV JAERNLEGERINGAR I VATTENBASERAT MEDIUM

摘要

Articles made of ferrous alloys, particularly articles made of carbon steels and alloyed steels, that have previously been brought to an elevated temperature of over 750 DEG C and generally from 800 to 950 DEG C, are quenched in an aqueous solution of polyvinylpyrrolidone containing an additive that causes reversible precipitation of polyvinylpyrrolidone at the surface of the articles at the time when they are placed in the quenching medium, the quenching medium being subjected to agitation. The most appropriate precipitating additive is sodium sulphate at a concentration of 5 to 10 g/l.