ASTM A106 / A106M
ASTM A106 is a standard material specification for carbon steel pipe for high temperature service in NPS 1/8 to NPS 48 (DN 6 to DN 1200) with nominal wall thickness as given in but not limited to ASME B36.10M. This specification covers chemical, mechanical, hydro-testing and other supplementary requirements for grade A, grade B and grade C pipes. Ferrobend stocks and supply high temperature carbon steel pipes to ASTM A106 specifications.
| Grades | Description |
|---|---|
| Grade A | - |
| Grade B | - |
| Grade C | - |
Chemical Composition
| Elements | Composition, % | ||
|---|---|---|---|
| Grade A | Grade B | Grade C | |
| Carbon, max | 0.25 [Note A] | 0.30 [Note B] | 0.35 [Note B] |
| 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 |
| Chromium, max [Note C] | 0.40 | 0.40 | 0.40 |
| Copper, max [Note C] | 0.40 | 0.40 | 0.40 |
| Molybdenum, max [Note C] | 0.15 | 0.15 | 0.15 |
| Nickel, max [Note C] | 0.40 | 0.40 | 0.40 |
| Vanadium, max [Note C] | 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: Unless otherwise specified by the purchaser, 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 1.65 %.
C: These five elements combined shall not exceed 1 %.
Heat Treatment
1. Hot-finished pipe need not be heat treated. When hotfinished pipe is heat treated, it shall be heat treated at a temperature of 1200 °F [650 °C] or higher.2. Cold-drawn pipe shall be heat treated after the final cold draw pass at a temperature of 1200 °F [650 °C] or higher.
Mechanical Properties
| Property | Tensile Strength, ksi | Yield Point, min, ksi | Elongation, min, %, in 2 Inch. | |||
|---|---|---|---|---|---|---|
| Longitudinal | Transverse | |||||
| Round | Strip | Round | Strip | |||
| Grade A | 48 [330] | 30 [205] | 28 | 35 | 20 | 25 |
| Grade B | 60 [415] | 35 [240] | 22 | 30 | 12 | 16.5 |
| Grade C | 70 [485] | 40 [275] | 20 | 30 | 12 | 16.5 |
A:
The minimum elongation in 2 in. [50 mm] shall be determined by the following equation:
e = 625000A0.2/ U 0.9
for inch-pound units, and
e = 1940A0.2/U 0.9
for SI units,
where:
e = minimum elongation in 2 in. [50 mm], %, rounded to the nearest 0.5 %,
A = cross-sectional area of the tension test specimen, in.2 [mm2], based upon specified outside diameter or nominal specimen width and specified wall thickness, rounded to the nearest 0.01 in.2 [1 mm2]. (If the area thus calculated is equal to or greater than 0.75 in.2 [500 mm2], then the value 0.75 in.2 [500 mm2] shall be used.), and
U = specified tensile strength, psi [MPa].
