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Maintain a convection coefficient

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Annealing is a process by which steel is reheated and then cooled to make it less brittle. Consider the reheat stage for a 100-mm-thick steel plate (p = 7830 kg/m3, c = 550 J/kg · K, k = 48 W/m · K), which is initially at a uniform temperature of Tj = 200°C and is to be heated to a minimum temperature of 550°C. Heating is effected in a gas-fired furnace, where products of combustion at T8 = 800°C maintain a convection coefficient of h = 250 W/m2 · K on both surfaces of the plate. How long the plate should be left in the furnace? 

Reference no: EM13880356

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