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Predict the hardness (DPN) of a plain-C steel that has been hardened and the tempered for 1.5 hrs. at 700 F. The composition of

Predict the hardness (DPN) of a plain-C steel that has been hardened and the tempered for 1.5 hrs. at 700 F. The composition of the steel (in wgt. %) is 0.40 C, 0.20 Si and 0.40 Mn.

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