... : Sand blasting of profile steel, ship board, steel board, steel material,steel structure.Pre-treatment: Pre-treatment of surface, steel board, profile steel, steel structure, before painting ... .0S less than 0.030P less than0.030HardnessGP HRC 46-50GL HRC 56-60GH HRC 63-65Density 7.6 g/cm3microstructure The tempered ...