Overview
This is a high-strength / low alloy grade produced in the normalized condition. It is predominantly used in environments where superior notch toughness is needed at low ambient temperatures. Typical applications is in the areas of construction equipment, offshore support structures, and other construction areas where additional strength is critical.
Chemical Requirements
*Elements represented in percentage
Where “-” appears in this table, there is no requirement
| Element | Grade A, % | Grade C, % | Grade D, % | Grade E, %A |
|---|---|---|---|---|
| Carbon, max | 0.18 | 0.20 | 0.20 | 0.22 |
| Manganese: | ||||
| 1½ in. [40 mm] and under in thickness | 1.00-1.35 | 1.15-1.50B | 0.70-1.35 | 1.15-1.50 |
| Over 1½ in. to 4 in. [40 to 100 mm], incl | 1.00-1.35 | 1.15-1.50B | 1.00-1.60 | 1.15-1.50 |
| Over 4 in. to 6 in. [100 to 150 mm], incl | C | C | C | 1.15-1.50 |
| Phosphorus, max | 0.030 | 0.030 | 0.030 | 0.030 |
| Sulfur, max | 0.030 | 0.030 | 0.030 | 0.030 |
| Silicon | 0.15-0.50 | 0.15-0.50 | 0.15-0.50 | 0.15-0.50 |
| Vanadium | – | – | – | 0.04-0.11 |
| Columbium | 0.05 max | 0.01-0.05 | – | D |
| Nitrogen, max | – | – | – | 0.03 |
| Copper, max | – | – | 0.35 | – |
| Nickel, max | – | – | 0.25 | – |
| Chromium, max | – | – | 0.25 | – |
| Molybdenum, max | – | – | 0.08 | – |
Tensile Requirements
| Grade A | Grades C and D | Grade E | |
|---|---|---|---|
| Yield point, min, ksi [MPa]: | |||
| 2.5 in. [65 mm] and under | 42 [290] | 50 [345] | 60 [415] |
| Over 2.5 in. to 4 in. [65 to 100 mm], incl | 42 [290] | 46 [315] | 60 [415] |
| Over 4 in. to 6 in. [100 to 150 mm], incl | B | B | 55 [380] |
| Tensile strength, ksi [MPa]: | |||
| 2.5 in. [65 mm] and under | 63 to 83 [430 to 570] | 70 to 90 [485 to 620] | 80 to 100 [550 to 690] |
| Over 2.5 in. to 4 in. [65 to 100 mm], incl | 63 to 83 [430 to 570] | 65 to 85 [450 to 590] | 80 to 100 [550 to 690] |
| Over 4 in. to 6 in. [100 to 150 mm], incl | B | B | 75 to 95 [515 to 655] |
| Elongation in 8 in. [200 mm], min, %C | 18 | 18 | 18 |
| Elongation in 2 in. [50 mm], min, %C | 23 | 23 | 23 |