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Carburization is faster at high temperatures. To reduce the time required to carburize a piece of -iron from 15 hours at 900 C to just

Carburization is faster at high temperatures. To reduce the time required to carburize a piece of -iron from 15 hours at 900 C to just 3 hours, what temperature should be used? (Assume the surface concentration of carbon is independent of temperature.)

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