FIELD: heat treatment of metals, possibly quenching tools of low-alloy and unalloyed cast iron with ledeburite structure. SUBSTANCE: method comprises use as quenching medium bubbling aqueous solution of copper sulfate and carbamide at next relation of ingredients (mass%): copper sulfate - (0.2-0.7); carbamide - (0.1-).4); bubbling water - the balance. EFFECT: quenching medium keeping capability for quenching without cracking of products. 1 tbl
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