A method for manufacturng spring steel without ferrite decarburization

摘要

The method for producing ferrite decarburization is not spring steel is provided.; The production method of the present invention, by weight%, carbon (C): 0.4 ~ 0.6%, silicon (Si): 1.3 ~ 1.6%, manganese (Mn): 0.5 ~ 0.7%, chromium (Cr): 0.4 ~ 0.7% the step of providing a billet (billet) is a composition, the balance Fe and other unavoidable impurities; The method comprising the billet is reheated to a temperature of 1000 ~ 1100 ℃ then rough rolling; The step of mapping the intermediate rolling the crude billet is rolled at 750 ~ 850 ℃ and rolling followed by a final reduction ratio that temperature range is at least 30% of the material from the spirit; Above the rolled wire rod from the winding temperature to 750 ~ 800 ℃ after the 600 ~ 650 ℃, cooled at a rate of less than 1 ℃ / s, followed by the step of air-cooling to room temperature; is configured to include a.