ASTM A53 and ASME SA53 is intended for mechanical and pressure applications and is also acceptable for ordinary uses in steam, water, gas and air lines. It is suitable for welding and for forming operations involving coiling, bending, and flanging, subject to certain qualifications.
A53 covers Seamless and Welded, Black and Hot-Dipped Galvanized nominal (average) wall pipe for coiling, bending, flanging and other special purposes and is suitable for welding. Continuous-Welded pipe is not intended for flanging. Purpose for which pipe is intended should be stated on order.
The steel for both seamless and welded pipe shall be made by one or more of the following processes: open-hearth, electric furnace, or basic-oxygen. The weld seam of electric-resistance welded pipe in Grade B shall be heat treated after welding.
| Type S (seamless) |
Type E | Type F | ||||||
| (electric- resistance welded) |
(furnace- welded pipe) |
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| Grade A | Grade B | Grade A | Grade B | Grade A | ||||
| Carbon max. % | 0.25 | 0.30* | 0.25 | 0.30* | 0.3 | |||
| Manganese % | 0.95 | 1.2 | 0.95 | 1.2 | 1.2 | |||
| Phosphorous, max. % | 0.05 | 0.05 | 0.05 | 0.05 | 0.05 | |||
| Sulfur, max. % | 0.045 | 0.045 | 0.045 | 0.045 | 0.045 | |||
| Copper, max.% | 0.40 | 0.40 | 0.40 | 0.40 | 0.4 | |||
| Nickel, max. % | 0.40 | 0.40 | 0.40 | 0.40 | 0.4 | |||
| Chromium, max. % | 0.40 | 0.40 | 0.40 | 0.40 | 0.4 | |||
| Molybdenum, max. % | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 | |||
| Vanadium, max. % | 0.08 | 0.08 | 0.08 | 0.08 | 0.08 | |||
| *For each reduction below 0.01% below the specified carbon maximum, an increase of 0.06% manganese above the specified maximum will be permitted up to a maximum of 1.65% (does not apply to SA53). | ||||||||
The minimum wall thickness at any point shall not be more than 12.5% under the nominal wall thickness specified.
Plus or minus 10%
Outside Diameter at any point shall not vary from standard specified more than:
| For NPS 1 1/2 and Smaller Sizes | For NPS 2 and Larger Sizes | |||||
| 1/64″ over | 1/64″ under | 1% over | 1% under | |||
| Seamless and Electric-resistance-welded | Continuous-Welded | |||
| Grade A | Grade B | |||
| Tensile Strength, min., psi | 48,000 | 60,000 | 45,000 | |
| Yield Strength, min., psi | 30,000 | 35,000 | 25,000 | |
Hydrostatic inspection test pressures for plain end and threaded and coupled pipe are specified. Hydrostatic pressure shall be maintained for not less than 5 seconds for all sizes of seamless and electric-resistance-weld pipe.
Tensile Test — Transverse required on ERW for NPS 8 and larger.
| Degree of Bend | Diameter of Mandrel | ||
| For Normal A53 Uses | 90 | 12 x nom dia. of pipe | |
| For Close Coiling | 180 | 8 x nom dia. of pipe |
Flattening Test — NPS 2 and larger XM and lighter walls.
| Standard Weight | |
| Single Random — 16′ – 22′. 5% may be jointers. If Plain Ends — 5% may be 12′ – 16′. | |
| Double Random — Shortest Length 22′, minimum average for order 35′. | |
| Extra Strong and Double Extra Strong | |
| Single Random — 12′ -22′. 5% may be 6′ – 12′. | |
| Double Random (XS and lighter) — Shortest Length 22′, minimum average for order 35′. | |
| Lengths longer than single random with wall thicknesses heavier than XS subject to negotiation. | |
(On Tags attached to each Bundle in case of Bundled Pipe)
| Rolled, Stamped, or Stenciled (Mfrs. Option) | ||
| Name brand of manufacturer | ||
| Kind of pipe, that is, Continuous Welded, Electric-Resistance-Welded A, Electric-Resistance-Welded B, Seamless A, Seamless B, XS for extra strong, XXS for double extra strong. | ||
| ASTM 53 | ||
| Length of pipe |
| Couplings — Applied handling tight. Couplings, 2″ and smaller straight tapped, other sizes taper tapped. | |
| Thread Protection — Applied to pipe 4″ and larger. | |
| End Finish (unless otherwise specified) — | |
| STD or XS, or wall thicknesses less than 0.500 in. (excluding XXS): Plain and beveled | |
| All XXS and wall thicknesses over 0.500 in.: Plain end square cut. |
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