In a metal alloy manufacturing and heat treatment plant and in its immersion quenching process, steel plates are first heated in a furnace and then quenched (or cooled) in a coolant bath to obtain the desired steel properties and surface hardness. In one such process, a flat, stainless steel plate is 0.6 cm

thick, 7.5 cm wide, and 0.3 m long is immersed horizontally at an initial temperature of 980ºC in a large water bath at 100ºC and at atmospheric pressure. Determine how long it will take this plate to cool to 540⁸C.

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54 Water bath 100°C Stainless steel plate 0.3 cm 0.6 cm 7.5 cm