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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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