ASTM A106 Grade B Round Pipe
For demanding high-temperature and high-pressure applications in power generation, petrochemical, and boiler systems, ASTM A106 Grade B Round Pipe stands as the industry benchmark for seamless carbon steel piping. As a premier member of the Seamless Carbon Steel Round Tube family, it offers superior strength and reliability compared to welded alternatives. While ERW Carbon Steel Round Pipe serves well for many structural and mechanical purposes, A106 Gr. B is specifically engineered for critical service conditions. It is often specified alongside or in place of ASTM A53 Carbon Steel Round Tube, particularly when seamless construction and higher temperature performance are mandatory. For projects requiring corrosion resistance in less aggressive environments, a Galvanized Carbon Steel Round Pipe may be considered, but for the core high-temp infrastructure, A106 Grade B remains the unmatched choice.
The exceptional performance of ASTM A106 Grade B Round Pipe is a direct result of its precise chemical composition and rigorous mechanical properties as defined by the ASTM International standard. This specification ensures consistent quality and performance across all supplied materials. The following tables detail the key parameters that define this high-performance piping product.
Chemical Composition Requirements
| Element | Composition, max % |
|---|---|
| Carbon | 0.30 |
| Manganese | 0.29 - 1.06 |
| Phosphorus | 0.035 |
| Sulfur | 0.035 |
| Silicon | 0.10 min |
| Chromium | 0.40 |
| Copper | 0.40 |
| Molybdenum | 0.15 |
| Nickel | 0.40 |
| Vanadium | 0.08 |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength, min | 415 MPa (60,200 psi) |
| Yield Strength, min | 240 MPa (35,000 psi) |
| Elongation in 2 in. (50.8 mm), min % |
|
Key Product Specifications & Tolerances
- Specification: Conforms to ASTM A106 / ASME SA106.
- Grade: B (Common grades are A, B, and C, with B being the most widely used).
- Type: Seamless (SMLS).
- Manufacturing Process: Hot finished or cold drawn.
- Size Range: Standard nominal pipe sizes (NPS) from 1/8" to 24" and larger. Outer diameters (OD) and wall thicknesses per ASME B36.10M.
- Wall Thickness: Available in standard (STD), extra strong (XS), and double extra strong (XXS) schedules, among others.
- Length: Typically supplied in random lengths (R/L) of 16-22 feet, or cut to length (C/TL) as required.
- End Finish: Plain end (PE), beveled end (BE) for welding, or threaded and coupled (T&C).
- Temperature Service: Suitable for high-temperature service up to approximately 750°F (399°C) for continuous operation.
- Testing & Certification: Hydrostatic or non-destructive electric test, heat analysis, mechanical properties test. Mill Test Certificate (MTC) or Certificate of Compliance (COC) provided.
- Surface Finish: Black (hot rolled) or bare (cold drawn). Can be coated or painted upon request.
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