Round Bar Specifications · Grade: Alloy steel · Standard: AISI, ASTM, BS, DIN, GB, JIS · OD:10-500mm · Thickness: Max:800mm · Width: 205mm~2300mm · Length: 1000mm~6000mm · Place of Origin: China (Mainland) · Model Number: 1.7220 / SCM430 / 30CrMo4 / 4130 ; 4140/42CrMo4/1.7225; En24 34CrNiMo6 1.6582 4340. · Application: Mould steel · Technique: Forged · Special Use: Mold Steel ,Statically and dynamically stressed components for vehicles, engines and machines. For parts of larger cross-sections, crankshafts, gears. · Shape: Round bars/Flat bar/Plate · Technology: Hot Rolled/Forged/Clod Draw · Heat treatment: Annealing/Q+T · Surface treatment:Black/Peeling/Polishing/Machined · Delivery condition: Hot rolled or forged/ Peeled or black surface/annealed or QT · Customer's logo: Available · Test: SGS/UT100%/Elements testing · Certificate: ISO/Mill certificate · Experience: Ten years manufacturer experience Chemical composition Standard Number C Mn Si Cr Mo P S Ni GB 42CrMo 0.38~0.45 0.50~0.8 0.17~0.37 0.9~1.2 0.15~0.25 =0.035 =0.035 =0.3 AISI 4140 0.40~0.45 0.75~1.0 0.15~0.35 0.8~1.1 0.15~0.25 =0.035 =0.040 GB 40CrNiMoA 0.37~0.44 0.17~0.37 0.50~0.80 0.6~0.9 0.15~0.25 =0.035 =0.035 1.25~1.65 AISI 4340 0.38~0.43 0.15~0.35 0.60~0.80 0.7~0.9 0.20~0.30 =0.035 =0.040 1.65~2.00