m303M303 is a type of mould steel with hh chromium and nickel content. It has hh hardness, strength and corrosion resistance. See its chemical composition, physical and mechanical» Color de identificación: NaranjaAzulNaranja (M303) y Blanco (M303 HH HARD) » Estado de suministro: Bonificado 290-330 HB (M303) Bonificado 350-390 HB (M303HH HHHARD) »