| Standard Alloy Boron SteelsB |
| Chemical Composition Ranges and Limits |
Grade
Designation |
Carbon |
Manganese |
Phosphorus,
Max |
Sulfur,
Max |
SiliconA |
Nickel |
Chromium |
Molybdenum |
| 50B44 |
.43/.48 |
.75/1.00 |
.035 |
.040 |
.15/.35 |
— |
.20/.60 |
— |
| 50B46 |
.44/.49 |
.75/1.00 |
.035 |
.040 |
.15/.35 |
— |
.20/.35 |
— |
| 50B50 |
.48/.53 |
.75/1.00 |
.035 |
.040 |
.15/.35 |
— |
.40/.60 |
— |
| 50B60 |
.56/.64 |
.75/1.00 |
.035 |
.040 |
.15/.35 |
— |
.40/.60 |
— |
| 51B60 |
.56/.64 |
.75/1.00 |
.035 |
.040 |
.15/.35 |
— |
.70/.90 |
— |
| 81B45 |
.43/.48 |
.75/1.00 |
.035 |
.040 |
.15/.35 |
.20/.04 |
.35/.55 |
.08/.15 |
| 94B17 |
.15/.20 |
.75/1.00 |
.035 |
.040 |
.15/.35 |
.30/.60 |
.30/.50 |
.80/.15 |
| 94B30 |
.28/.33 |
.75/1.00 |
.035 |
.040 |
.15/.35 |
.30/.60 |
.30/.50 |
.08/.15 |
| A | Silicon may be specified by the purchaser as 0.10% maximum. The need for 0.10% maximum generally relates to severe cold-formed parts. |
| B | These steels can be expected to contain 0.0005 to 0.003% boron. If the usual titanium additive is not permitted, the steels can be expected to contain up to 0.005% boron. |
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