METHOD FOR PRODUCING LOW TEMPERATURE BAINITE STEEL CONTAINING ALUMINUM

摘要

A method for producing low temperature bainite steel containing aluminum may include providing an alloy steel containing aluminum, carbon, chromium, silicon, molybdenum, manganese and nickel, wherein the amount of aluminum is in the range of 0.5 to 1.5 wt. %, and the amount of carbon is in the range of 0.2 to 1.1 wt. %; smelting to convert the alloy steel into a molten steel, followed by subjecting to refining and vacuum degassing, and then subjected to rolling or forging; heating the steel to 880-950° C., cooling the steel to M_s+10° C. at a rate higher than 50° C./min, continuously and slowly cooling the steel from M_s+10° C. to M_s×100×C(wt %)° C., holding the steel at a temperature of 250° C. to 350° C. for 20 to 30 min, and then air cooling the steel to room temperature, holding the steel at a temperature of 180° C. to 280° C. for 60 min, and then air cooling the steel to room temperature.