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Steel balls 12 mm in diameter are annealed by heating to 1100 K and then slowly cooling to 380 K in an air environment for which [infinity] 325 K and 20 W/m2·K. Assuming the properties of the steel to
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Steel balls 12 mm in diameter are annealed by heating to 1100 K and then slowly cooling to 380 K in an air environment for which [infinity] 325 K and 20 W/m2·K. Assuming the properties of the steel to be 40 W/m·K, 7800 kg/m3, and 600 J/kg·K, estimate the time required for the cooling process.

User GuavaMantis
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6 votes

Answer:

0.3117 hour required for the cooling process.

Step-by-step explanation:

See attached pictures.

Steel balls 12 mm in diameter are annealed by heating to 1100 K and then slowly cooling-example-1
Steel balls 12 mm in diameter are annealed by heating to 1100 K and then slowly cooling-example-2
User Roman Toasov
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