In an annealing process, a 50-mm-thick stainless steel plate (p = 8238 kg/m3 , cp = 468 J/kg·K, k = 13.4 W/m·K, and α = 3.48 × 10-6 m2 /s) was reheated in a furnace from an initial uniform temperature of 230°C. The ambient temperature inside the furnace is at a uniform temperature of 1000°C and has a convection heat transfer coefficient of 215 W/m2 ·K. If the entire stainless steel plate is to be heated to at least 600°C, determine the time that the plate should be heated in the furnace using (a) Table 18-2 (b) the Heisler chart (Figure 18-15).
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