... .Delivery Conditon:annealed, black/turned surface 3.Short Delivery Time D6 alloy steel round barsChemical Composition(%) CSi Mn P S Cr ---- W ... .0 --- 0.60-0.80Specialty High charcoal and chromium tool steel, have high penetration, small distortion, high rigidity, good endurance.Use ... , (180-200`C)≥2 hours HRC60-62 3.If it is necessary, it could be changed into 320-350`C≥2 ...