1.2550 round bars: 2.Diameter:10mm~800mm 3.Delivery Conditon:annealed, black/turned surface Chemical Composition(%) C Si Mn P S Cr V W 0.55-0.650.50-0.700.15-0.45 â?¤0.030 â?¤0.030 0.90-1.20 0.10-0.201.80-2.10 Specialty High charcoal and chromium tool steel, have high penetration, small distortion, high rigidity, good endurance. Use 1.Cold pressing mold extrusion with low pressing and burden, imprint mold, cold cutting scissor Heat Treatment 1.Quench: 950-980`C cold oil(need re-preheat~500`C-850`C)HRCâ?¥60 2.Eliminate stress, stabilize framework tempering, (180-200`C)â?¥2 hours HRC60-62 3.If it is necessary, it could be changed into 320-350`Câ?¥2 hours backfire HRCâ?¥60-62 4.Annealing: 780-800`C slow cooling Melting Process 1. EAF: Electric Furnace+LF+VD(Optional) 2. ESR: Electric Furnace+LF+VD+Eleroslag Remelted(Optional) UT Class According to Standard of SEP 1921/84,100% Volume, Level C/c, D/d or E/e Tolerance on Quantity +/-10% Per Size -