The utility model relates to a steel brake drum, it includes brake drum body, brake drum body adopts casting carbon steel or cast alloy steel integral cast to form, perhaps adopts the whole spinning of low carbon steel sheet to form, one deck sclerosis layer has on brake drum body 's the braking working face, is the superficial hardness on sclerosis layer 180 241HBW. The casting carbon steel is in mild steel, medium carbon steel or the high -carbon steel any one, contain one kind or two kinds of alloying element in chromium, nickel, the molybdenum in the cast alloy steel, is the mild steel plate thickness 16 25mm, tensile strength >= 360MPa, the elongation >= 24%, the use of surface carbonization of sclerosis layer, laser surface strike one kind or several kinds in hardening treatment, nitrogen treatment, the surface rolling processing. The utility model discloses a brake drum adopts casting carbon steel or cast alloy steel integral cast to form, perhaps adopts the whole spinning of low carbon steel sheet to form, has improved steel brake drum's comprehensive properties, has improved the life of brake drum.