A final quench in stirred oil leads to a hardness


In heat-treating a complex -shaped part made from a 5140 steel, a final quench in stirred oil leads to a hardness of Rockwell C30 at 3mm beneath the surface. This is unacceptable, as design specifications require a hardness of Rockwell C45 at that point. Select an alloy
substitution to provide this hardness, assuming the heat treatment must remain the same. 

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Mechanical Engineering: A final quench in stirred oil leads to a hardness
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