Round Hot Work Tool Steel M 2, For Construction

Chemical Composition: ElementMinMaxCarbon, Cv0.90Manganese, Mn-.–0.40Silicon, Si-.–0.40Molybdenum, Mo4.505.50Chromium,Cr3.804.50W5.506.70V1.602.20Physical Properties: PropertiesMetricImperialDensity (@20°C/68°F)Density0.294 lb/in3Melting point4680°C2600°FMechanical Properties: PropertiesMetricImperialHardness, Rockwell C (air cooled from 899°C, 30 mins)54.554.5Hardness, Rockwell C (air cooled from 927°C, 30 mins)5656Hardness, Rockwell C (air cooled from 982°C, 30 mins)56.556.5Modulus of elasticity207 GPa30000 ksiCharpy impact (V-notch; oil quenched from 954°C; 149°C temper temperature)10.8 J8.00 ft-lbCharpy impact (V-notch; oil quenched from 954°C; 625°C temper temperature)29.8 J22.0 ft-lbMachinability (1% carbon steel)70.0 - 75.0%70.0 - 75.0%Poisson's ratio0.27-0.300.27-0.30Thermal Properties: PropertiesMetricImperialCTE, linear (@20.0 - 100°C/ 68.0 - 212°F)10 μm/m°C5.56 μin/in°FCTE, linear (@20.0 - 500°C/68.0 - 932°F)12.2 μm/m°C6.78 μin/in°FCTE, linear (@20.0 - 850°C/68.0 - 1560°F)12.6 μm/m°C7 μin/in°FHeat Treatment: M2 tool steels are pre-heated prior to hardening at 2610°C (4730°F) followed by rapid heating from 2610°C (4730°F) to 3960°C (7160°F). These steels are then cooled for 3 to 5 min and quenched in air.Annealing: M2 tool steels are annealed at 2925°C (5297°F) and cooled at 72°C (162°F) per hour or even less.