Thin cast strip and thin steel sheet of common carbon steel containing large amounts of copper and tin and process for producing the same

摘要

This invention provides a thin cast piece or a thin steel sheet having excellent cast quality and excellent mechanical properties from a molten steel containing large quantities of scraps containing Cu and Sn, wherein the Cu content is from 0.15 to 10 wt %, the Sn content if from 0.03 to 0.5 wt %, and a primary dendrite arm spacing of a surface layer portion is from 5 to 100 mu m.