ASTM A53/A53M — Pipe, steel, black and hot-dipped, zinc-coated, welded and seamless
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Scope
Specification for black and hot-dip galvanized welded and seamless steel pipe in NPS 1/8 to 26, for coiling, bending, flanging, threading and general mechanical and pressure applications. Defines two grades, A (205 MPa yield) and B (240 MPa yield), and three manufacturing types: Type F continuous furnace butt welded (Grade A only, NPS 4 and under), Type E electric-resistance welded, Type S seamless. Covers chemical composition ceilings, tensile requirements, flattening, bend and hydrostatic tests, galvanized coating, and threaded or plain ends. It contains no impact-test requirement and publishes no elevated-temperature allowable stresses.
Grades covered by ASTM A53
| Grade | No. | Type | C % | Yield MPa | Tensile MPa | Nearest equivalents |
|---|---|---|---|---|---|---|
| A53 Grade B | K03005 | Pipe steel for general and structural service, welded or seamless | ≤ 0.3 | 240 | 415 | a106-b, p235tr1, s195t |
Revision history and superseded standards
| Year | Change |
|---|---|
| 1920s | early editions as a general-purpose pipe specification alongside A120 |
| 1988 | A120 withdrawn; its ordinary-use scope absorbed into A53 |
| 2012 | Type F restricted to Grade A and to NPS 4 and smaller |
| 2020 | A53/A53M-20 — current edition |
Supersedes: ASTM A120 (withdrawn — black and galvanized pipe for ordinary use); ASTM A53:earlier editions (type and grade restrictions changed).
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