ASTM A106 Grade B: Seamless Carbon Steel Pipe for High-Temp Service
ASTM A106/A106M · Updated: 2026-05-25
ASTM A106 Grade B is the standard specification for seamless carbon steel pipe in high-temperature service—power plants, refineries, and chemical plants. It is designed for temperatures up to 400°C (750°F), with silicon-killed steel ensuring fine-grain structure for elevated-temperature strength. Available in nominal sizes from 1/8 inch to 48 inches in schedules STD, XS, and XXS. Not intended for low-temperature service below -29°C (-20°F) unless supplementary impact testing is specified.
Quick Facts
| Category | Carbon Steel |
| Standard | ASTM A106/A106M |
| Density | 7.85 g/cm³ |
| Yield Strength | 240 MPa (35 ksi) |
| Tensile Strength | 415 MPa (60 ksi) |
Global Equivalents & Cross-Reference
| Alternative Standard / Grade | Action |
|---|---|
| SA-106B | Compare |
| P235GH | Compare |
| STPG370 | Compare |
| GB 20 | Compare |
| S195T | Compare |
Related Materials
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Frequently Asked Questions
What is the difference between A106 Gr B and A53 Gr B pipe?
A106 is seamless-only and specified for high-temperature service with mandatory silicon-killed fine grain practice. A53 can be seamless or welded and covers a broader range of general-purpose applications including structural, pressure, and mechanical uses. A106 has tighter chemistry controls and is preferred for process piping in refineries and power plants above 200°C. A53 is more commonly used for low-pressure plumbing, fire protection, and general industrial piping.