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Recommended Maximum Hardness for Steels*
with less than 2 inch cross sectional thickness

MATERIAL HARDNESS (Rc) MATERIAL HARDNESS (Rc)
A-2 59/61 1060 56/58
A-6 56/58 1045 48/52
D-2 58/60 1090 58/60
Flexor 48/50 4130 44/46
H-13 52/54 4140 52/56
L-6 58/60 4150 52/56
OH 59/61 4340 52/56
O-1 59/61 416SS 45/50
O-2 59/61 420SS 48/50
O-6 59/61 440A SS 52/54
S-1 54/56 440B SS 54/56
S-5 56/58 440C SS 56/58
S-7 56/58 52100 58/60
WH 58/60 6150 52/56
Carburized Steels with less than .30% Carbon (1010, 1018, 1117, 8620, etc.) 59/61

*These are the maximum hardness values recommended by East~Lind Heat Treat, Inc. for use with general tool & die steels. Though most of these steels are capable of attaining a slightly higher hardness, these numbers represent good, safe, practical maximum hardness values for use in many tool & die steel applications. They are a good rule of thumb; however, they are not exact or concrete figures due to the many variables that may influence the maximum hardness desired for a steel part. These numbers maybe adjusted up or down, depending on the part's application, configuration (design) and/or mass (cross-sectional thickness).

 

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