| Restricted Hardenability Steels |
| Chemical Composition Ranges and Limits |
| SAE No. |
C |
Mn |
Si |
Ni |
Cr |
Mo |
| 15B21RH* |
.17/.22 |
.80/1.10 |
.15/.35 |
— |
— |
— |
| 15B35RH* |
.33/.38 |
.80/1.10 |
.15/.35 |
— |
— |
— |
| 3310RH |
.08/.13 |
.40/.60 |
.15/.35 |
3.25/3.75 |
1.40/1.75 |
— |
| 4027RH |
.25/.30 |
.70/.90 |
.15/.35 |
— |
— |
.20/.30 |
| 4118RH |
.18/.23 |
.70/.90 |
.15/.35 |
— |
.40/.60 |
.08/.15 |
| 4120RH |
.18/.23 |
.90/1.20 |
.15/.35 |
— |
.40/.60 |
.13/.20 |
| 4130RH |
.28/.33 |
.40/.60 |
.15/.35 |
— |
.80/1.10 |
.15/.25 |
| 4140RH |
.38/.43 |
.75/1.00 |
.15/.35 |
— |
.80/1.10 |
.15/.25 |
| 4145RH |
.43/.48 |
.75/1.00 |
.15/.35 |
— |
.80/1.10 |
.15/.25 |
| 4161RH |
.56/.64 |
.75/1.00 |
.15/.35 |
— |
.70/.90 |
.25/.35 |
| 4320RH |
.17/.22 |
.45/.65 |
.15/.35 |
1.65/2.00 |
.40/.60 |
.20/.30 |
| 4620RH |
.17/.22 |
.45/.65 |
.15/.35 |
1.65/2.00 |
— |
.20/.30 |
| 4820RH |
.18/.23 |
.50/.70 |
.15/.35 |
3.25/3.75 |
— |
.20/.30 |
| 50B40RH* |
.38/.43 |
.75/1.00 |
.15/.35 |
— |
.40/.60 |
— |
| 5130RH |
.28/.33 |
.70/.90 |
.15/.35 |
— |
.80/1.10 |
— |
| 5140RH |
.38/.43 |
.70/.90 |
.15/.35 |
— |
.70/.90 |
— |
| 5160RH |
.56/.64 |
.75/1.00 |
.15/.35 |
— |
.70/.90 |
— |
| 8620RH |
.18/.23 |
.70/.90 |
.15/.35 |
.40/.70 |
.40/.60 |
.15/.25 |
| 8622RH |
.20/.25 |
.70/.90 |
.15/.35 |
.40/.70 |
.40/.60 |
.15/.25 |
| 8720RH |
.18/.23 |
.70/.90 |
.15/.35 |
.40/.70 |
.40/.60 |
.20/.30 |
| 8822RH |
.20/.25 |
.75/1.00 |
.15/.35 |
.40/.70 |
.40/.60 |
.30/.40 |
| 9310RH |
.08/.13 |
.45/.65 |
.15/.35 |
3.00/3.50 |
1.00/1.40 |
.08/.15 |
NOTE: Unless specified: Cu = .35 max, Ni = .25 max, Cr = .20 max, Mo = .06 max.
* Boron content is .0005 to .003.
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