Suggest a surface cooling rate to achieve a hardness of Rockwell C 55 instead of 59, referring to Figure 3-23 and Figure 3-23b.
FIG 3-23
Jominy end-quench test
Since at about 9 mm from the quenched end the hardness is 55 Rockwell C, the cooling
rate should be about 30ºC/s from the cooling rate curve to achieve Rockwell C 55.
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