30CrMnSiNi2A Alloy steel bar 1.strict quality control2.reasonable prices3.best service 30CrMnSiNi2A Alloy steel C 0.27~0.34 Si 0.90~1.20 Mn 1.00~1.30 ... alloy, anticorrosion alloy, precision alloy, flat steel, square steel, die steel, spring steel, carbon tool steel, stainless steel, alloy steel, high speed steel, carbon structural steel, hot-rolled bar, hot-rolled wire rod, forged steel ...