And a method of manufacturing the steel austenite grain coarsening temperature is high

摘要

A carbon of 0.4 wt%, aluminum 0.06 wt%, titanium 0.01 wt%, niobium 0.01 weight percent, vanadium less than 0.02% by weight, an average particle size is 50 nanometers, with a fine oxide particles containing silicon and iron distributed in the steel microstructure, which may be 5 to 30 nm, steel high austenite grain coarsening temperature. Temperatures up to 750 ℃, a residence time of 20 minutes, steel may have fine oxide particles distributed can limit the ferrite recrystallization at the strain level up to 10.0% at least, the microstructure. Is introduced into the casting rolls, 250ppm less than the free oxygen content to form a casting pool of molten carbon steel 20~60ppm, the total oxygen content of a continuous casting steel strip is rotated in the direction of each other casting roll 70ppm, usually at can be made of steel by the.