| SPECIFICATION | A2 | D2 | O1 | S5 | S7 |
| THICKNESS (Max. in.)* | 6� | 6� | 6� | 2� | 6� |
| CHEMICAL COMPOSITION Carbon (max.) | .95/1.05 | 1.40/1.60 | .85/1.00 | .50/.65 | .45/.55 |
| Manganese | .40/1.00 | .25/.60 | 1.00/1.40 | .60/1.00 | .20/.90 |
| Phosphorous (Max.) | .030 | .030 | .030 | .030 | .030 |
| Sulfur (Max.) | .010 | .010 | .010 | .010 | .010 |
| Chromium | 4.75/5.50 | 11.00/13.00 | .40/.60 | .10/.50 | 3.00/3.50 |
| Molybdenum | .90/1.40 | .70/.25 | - | .20/1.35 | 1.30/1.80 |
| Silicon | .10/.50 | .10/.60 | .10/.50 | 1.75/2.25 | .20/1.00 |
| Vanadium | .15/.50 | .50/1.10 | .30 max. | .15/.35 | .35 max. |
| Tungsten | - | - | .40/.60 | - | - |
| Nickel (Max.) | ** | ** | ** | ** | ** |
| Copper (Max.) | ** | ** | ** | ** | ** |
| SURFACE HARDNESS - (HB) max. in ANNEALED CONDITION | 235 | 235 | 212 | 235 | 223 |
** Nickel & Copper: .75% max., unless otherwise specified
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�1999, Bethlehem Steel Corporation