SPECIFICATION FOR SEAMLESS CARBON STEEL PIPE FOR HIGH-TEMPERATURE SERVICE
CHEMICAL REQUIREMENTS
Composition, %
| Grade A | Grade B | Grade C | |
| Carbon, max A | 0.25 | 0.30 | 0.35 |
| Manganese | 0.27–0.93 | 0.29–1.06 | 0.29–1.06 |
| Phosphorus, max | 0.035 | 0.035 | 0.035 |
| Sulfur, max | 0.035 | 0.035 | 0.035 |
| Silicon, min | 0.10 | 0.10 | 0.10 |
| Chrome, max B | 0.40 | 0.40 | 0.40 |
| Copper, max B | 0.40 | 0.40 | 0.40 |
| Molybdenum,max B | 0.15 | 0.15 | 0.15 |
| Nickel, max B | 0.40 | 0.40 | 0.40 |
| Vanadium, max B | 0.08 | 0.08 | 0.08 |
A For each reduction of 0.01% below the specified carbon maximum,an increase of 0.06% manganese above the specified maximum will be permitted up to a maximum of 1.35%.
B These five elements combined shall not exceed 1%.
TENSILE REQUIREMENTS
| Grade A | Grade B | Grade C | |
| Tensile strength, min, psi (MPa) | 48 000 (330) | 60 000 (415) | 70 000 (485) |
| Yield strength, min, psi (MPa) | 30 000 (205) | 35 000 (240) | 40 000 (275) |
P Number/ Group Number
|
ASTM A106
|
Grade A | Grade B | Grade C |
| P Number | 1 | 1 | 1 |
| Group | 1 | 1 | 2 |