Alloys used in the manufacture of steel. (1) 12–15% zirconium alloy. Approximate analysis: zirconium 12–15%, silicon 39–43%, iron 40–45%; application: steel of high silicon content.(2) 35–40% zirconium alloy. Approximate analysis: zirconium 35–40%, silicon 47–52%, iron 8–12%; application: steel of low silicon content.