ASTM A53 / A53M – 12: Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless
ASTM A53 / A53M – 12
Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless
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.
Materials and Manufacture：
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.
Carbon max. %
Phosphorous, max. %
Sulfur, max. %
Nickel, max. %
Chromium, max. %
Molybdenum, max. %
Vanadium, max. %
Sets standards for coating of pipe with zinc inside and outside by the hot-dipped process. Weight of coating must not average less than 1.8 oz. per square foot and not less than 1.6 oz. per square foot.
Permissible Variations in Wall Thickness：
The minimum wall thickness at any point shall not be more than 12.5% under the nominal wall thickness specified.
Permissible Variations in Weights per Foot：
Plus or minus 10%
Seamless and Electric-resistance-welded
Tensile Strength, min., psi
Yield Strength, min., psi
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.
Mechanical Tests Specified：
Tensile Test — Transverse required on ERW for NPS 8 and large. Sending Test (Cold) — STD and XS-NPS 2 and under XXS-NPS 1 1/4 and under.
Degree of Bend
Diameter of Mandrel
For Normal A53 Uses
12 x nom dia. of pipe
For Close Coiling
8 x nom dia. of pipe
Flattening Test — NPS 2 and larger STD and XS. (Not required for XXS pipe.)
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.
|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.
a53 Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless1
Diameter & Tolerance:
For pipe ≤ NPS 11⁄2 [DN 40], the outside diameter at any point shall not vary more than 1⁄64 in. [0.4 mm].
For pipe ≥NPS 2 [DN 50], the outside diameter shall not vary more than ±1%.
1), Zinc: The zinc used for the coating shall be any grade of zinc conforming to Specification B 6
2), Weight of Coating—The weight of zinc coating shall be not less than 1.8 oz/ft2[0.55 kg/m2] as determined from the average results of the two specimens taken for test in the manner prescribed in 19.5 and not less than 1.6 oz/ft2[0.49kg/m2] for either of these specimens. And testing the weight of zinc according to ASTMB90
– Low pressure systems
– Structural applications
– Mechanical components