ASTM A106/A106M — Standard Specification for Seamless Carbon Steel Pipe for High-Temperature Service
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Scope
Seamless carbon steel pipe NPS 1/8 to 48 for high-temperature service, suitable for bending, flanging and welding: Grades A, B and C (205, 240, 275 MPa yield; 330, 415, 485 MPa tensile), killed steel with Si ≥ 0.10 %. Hot-finished or cold-drawn; hydrostatic and NDE tests; supplementary S1–S9. Adopted by ASME as SA-106; dimensions per ASME B36.10M.
Grades covered by ASTM A106
| Grade | No. | Type | C % | Yield MPa | Tensile MPa | Nearest equivalents |
|---|---|---|---|---|---|---|
| A106 Grade B | K03006 | Seamless carbon steel pipe for high-temperature service | ≤ 0.3 | 205 | ≥ 330 | A53 Gr. B (Type S), API 5L Gr. B, P235GH / P265GH |
Revision history and superseded standards
| Year | Change |
|---|---|
| 1926 | A106 first issued |
| 2019 | A106/A106M-19a — current |
Where to buy the standard
The full text is copyrighted by ASTM International and is not reproduced here. Purchase the current edition from ASTM International or your national standards body. The values on this site are the normative limits as published; the standard's own tables, notes and test methods govern.
Related standards
Seamless, and for temperature
A106 covers seamless carbon steel pipe for high-temperature service in Grades A, B and C, of which Grade B carries almost all the volume. It is the American pressure-piping standard, and its closest neighbour — A53 — is not a substitute.
The difference is duty. A53 covers welded and seamless pipe for general mechanical and low-pressure work; A106 is seamless only, with tighter chemistry, mandatory elevated-temperature suitability and no welded option. Dual-stamped A53/A106 pipe exists and satisfies both; A53 alone does not satisfy an A106 specification.
Schedule is a series, not a thickness
A106 pipe is ordered by NPS and schedule, and neither is a measurement. NPS is a label: 2 in NPS has an outside diameter of 60.3 mm. Schedule is a series in which wall thickness rises with diameter — SCH 40 is 3.91 mm on DN 50 and 7.11 mm on DN 150.
A quotation that names NPS and schedule is complete. One that names a nominal size and a millimetre wall is describing a different product, most likely a structural tube, and it will not carry the pressure certification the line needs.