... ,carbon/alloystructural steel,auto steel, tool steel, --Standard:AI corrossion resistant alloy steel --Carbon structural steels: The carbon steel (i.e. high ... for construction of plant house, bridge, boiler and vessels etc. --Alloy structural steels: Besides the element C (short for carbon ... ), alloy steel may contains one or several kinds of alloy element i.e. Si, Mn, V ...