NON QUENCHED AND TEMPERED STEEL HAVING ULTRAFINE-GRAINED PEARLITE AND FABRICATING METHOD THEREFOR

摘要

hot forging steels for high temperature compression deformation steps ; Rapid cooling step of rapidly cooling the crude product by simple heat the hot forging step as pearlite transformation of the low-temperature region ; Isothermal transformation step for holding the sub-cooled heat isothermally simple crude product in the low temperature region of pearlite transformation by the rapid cooling step ; And air-cooling step of air cooling the heat filament rough simple steps the isothermal transformation ; the non - quality teaching method with a micro- fine grained pearlite structure that includes the vaginal and introduction by him Treviso ;