Question

Steel rods with density of 7832 kg/m3 specific heat 434 j/kg k and thermal conductivity

Answer 1

k = 63.9 W/m2 ·K) are heated in a furnace to 850°C and then quenched in a water bath at 50°C for a period of 40 seconds as part of a hardening process. The convection heat transfer coefficient is 650 W/m2 ·K.