Abstract
1. The cooling capacity of polymeric quenching agents is governed not so much by their concentration, as viscosity and molecular weight of the dissolved polymer. 2. Solutions of a single polymer with the same concentration but different viscosity differ sharply in their cooling capacity, and the cooling capacity of solutions of a single polymer with different concentrations but the same viscosity is practically the same. 3. For aqueous solutions of polymers there exists a critical viscosity whose increase has almost no effect on cooling rate. 4. Hardenability of steels 40Kh, 38KhGS, and ShKh15 with increasing polymer solution viscosity decreases smoothly, but on reaching the critical viscosity it decreases sharply.
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