ASTM A106 steel pipes is a standard specification for seamless carbon steel pipes used in high-temperature services. The specification covers three different grades: A, B, and C, which differ mainly in their chemical composition and mechanical properties.
1. Chemical Composition:
Grade A has the lowest carbon content, followed by Grade B and then Grade C, which has the highest carbon content.
Grade A: ≤ 0.25% Carbon
Grade B: ≤ 0.30% Carbon
Grade C: ≤ 0.35% Carbon
| CHEMICAL REQUIREMENTS | ||
|---|---|---|
| ELEMENT | COMPOSITION, % | |
| ASTM A106 Gr.B | ASTM A106 Gr.C | |
| C maxA | 0.30 | 0.35 |
| Mn | 0.29-1.06 | 0.29-1.06 |
| P, max | 0.04 | 0.04 |
| S, max | 0.04 | 0.04 |
| Si, min | 0.10 | 0.10 |
| Cr, maxB | 0.40 | 0.40 |
| Cu, maxB | 0.40 | 0.40 |
| Mo, maxB | 0.15 | 0.15 |
| Ni, maxB | 0.40 | 0.40 |
| V, maxB | 0.08 | 0.08 |
2.Mechanical Properties:
Tensile Strength (Ultimate strength):
Grade A: 48,000 psi (330 MPa)
Grade B: 60,000 psi (415 MPa)
Grade C: 70,000 psi (485 MPa)
| Tensile Requirements | ||
|---|---|---|
| ASTM A106 Gr.B | ASTM A106 Gr.C | |
| Y.S, min, psi[Mpa] | 35 000 [240] | 40 000 [275] |
| T.S., min, psi[Mpa] | 60 000 [415] | 70 000 [485] |
Yield Strength (The stress at which material begins to deform permanently):
Grade A: 30,000 psi (205 MPa)
Grade B: 35,000 psi (240 MPa)
Grade C: 40,000 psi (275 MPa)
| ELONGATION | |||
|---|---|---|---|
| ASTM A106 Gr.B | ASTM A106 Gr.C | ||
| L | T | L | T |
| 22 | 12 | 20 | 12 |
3. Applications:
Grade A: Used where lower strength is acceptable, such as low-pressure piping.
Grade B: The most commonly used grade, suitable for higher pressure and temperature.
Grade C: Used for even higher pressure and temperature applications due to its higher strength.
ASTM A106 Grade A steel pipe has the lowest strength, while A106 Grade C has the highest strength. A106 Grade B is the most widely used due to its balance of strength and cost.For any needs on ASTM A106 Grade A, B, and C, please contact pipe@stpipefitting.cn
