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ASTM A106 Grade A/B Technical Overview
ASTM A106 (ASME SA106) is the standard specification for seamless carbon steel pipe for high-temperature service. It is most commonly used in refineries and plants when gases or fluids are transported at high temperatures and pressures. At Steel Emporium, we offer Grade A and Grade B variants. Grade B is the most common choice due to its higher tensile and yield strength. ASTM A106 pipes are strictly seamless and are suitable for bending, flanging, and similar forming operations. Our inventory ensures 100% compliance with hydrostatic testing and dimensional tolerances required by the ASME B36.10M standard.
Key Material Advantages
High Heat Stability
Engineered to maintain mechanical strength at elevated temperatures.
Pressure Handling
Seamless construction allows for superior reliability in high-pressure lines.
Formability
Highly suitable for bending, flanging, and various fabrication tasks.
| Grade | C (max) | Mn | P (max) | S (max) | Si (min) | Cr* | Cu* | Ni* |
|---|---|---|---|---|---|---|---|---|
| Grade A | 0.25% | 0.27 - 0.93 | 0.035 | 0.035 | 0.10 | 0.40 | 0.40 | 0.40 |
| Grade B | 0.30% | 0.29 - 1.06 | 0.035 | 0.035 | 0.10 | 0.40 | 0.40 | 0.40 |
| Property | Grade A | Grade B |
|---|---|---|
| Tensile Strength (min) | 330 MPa (48,000 psi) | 415 MPa (60,000 psi) |
| Yield Strength (min) | 205 MPa (30,000 psi) | 240 MPa (35,000 psi) |
| Elongation | As per standard formula | As per standard formula |
| Feature | Over | Under |
|---|---|---|
| Wall Thickness | - | 12.5% |
| Outside Diameter (1.5" to 4") | 0.8 mm | 0.8 mm |
| Outside Diameter (4" to 8") | 1.6 mm | 0.8 mm |
| Weight per foot | 10% | 3.5% |
| ASTM | ASME | DIN | EN Designation | JIS |
|---|---|---|---|---|
| A106 Gr. B | SA106 Gr. B | St 45.8 | EN 10216-2 P265GH | JIS G3456 STPT410 |
| NB Size | OD (mm) | SCH 40 (STD) | SCH 80 (XS) | SCH 160 |
|---|---|---|---|---|
| 1/2" | 21.3 | 1.27 | 1.62 | 1.95 |
| 1" | 33.4 | 2.50 | 3.24 | 4.24 |
| 2" | 60.3 | 5.44 | 7.48 | 11.11 |
| 4" | 114.3 | 16.07 | 22.32 | 33.54 |
| 6" | 168.3 | 28.26 | 42.56 | 67.56 |
| 8" | 219.1 | 42.55 | 64.64 | 104.91 |
Industrial Applications
Oil & Gas Refineries
High-heat hydrocarbon process piping.
Power Plants
Main steam and auxiliary steam lines.
Industrial Boilers
Piping for high-pressure boiler units.