Hot Die Steel for Automobile Industry

Chromium hot-work tool steels are classified as group H steels by the AISI classification system. This series of steels start from H1 to H19. H13 chromium hot-work steel is widely used in hot and cold work tooling applications. Due to its excellent combination of high toughness and fatigue resistance H13 is used more than any other tool steel in tooling applications. This article will give an overview of H13 chromium hot-work steels. Chemical Composition The following table shows the chemical composition of H13 tool steels.ElementContent (%)Chromium, Cr4.75-5.50Molybdenum, Mo1.10-1.75Silicon, Si0.80-1.20Vanadium, V0.80-1.20Carbon, C0.32-0.45Nickel, Ni0.3Copper, Cu0.25Manganese, Mn0.20-0.50Phosphorus, P0.03Sulfur, S0.03 Physical Properties The physical properties of H13 tool steels are given in the following table.PropertiesMetricImperialDensity (@20°C/68°F)7.80 g/cm30.282 lb/in3Melting point1427°C2600°F Mechanical Properties The mechanical properties of H13 tool steels are tabulated below.PropertiesMetricImperialTensile strength, ultimate (@20°C/68°F, varies with heat treatment)1200 - 1590 MPa174000 - 231000 psiTensile strength, yield (@20°C/68°F, varies with heat treatment)1000 - 1380 MPa145000 - 200000 psiReduction of area (@20°C/68°F)50.00%50.00%Modulus of elasticity (@20°C/68°F)215 GPa31200 ksiPoisson's ratio0.27-0.300.27-0.30 Thermal Properties The following table shows the thermal properties of H13 tool steels.PropertiesConditionsT (ºC)TreatmentThermal expansion10.4 x 10-6/ºC20-100-Thermal conductivity28.6 W/mK215-