Patent ID: 7985305
Filing Date: 2011-07-26
Classification: C21D

Abstract:
1. A method for quenching steel, comprising: providing a steel; heating the steel; and quenching the steel using the polymeric quenchant, wherein the steel has a temperature of maximum cooling rate exceeding 500° C., and a cooling rate at 300° C. less than 30° C./sec during the quenching, wherein the polymeric quenchant comprises an inorganic nanoparticle, a water-soluble polymer, and water, wherein a weight ratio of the inorganic nanoparticle, water-soluble polymer and water is about 0.05-5:1-5:100, and the inorganic nanoparticle is talc, smectite clay, vermiculite, halloysite, sericite, saponite, montmorillonite, beidellite, nontronite, mica, hectorite, or a combination thereof.