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What is STEEL PIPE ASTM A53 Standard?

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Table of Contents


NPS 1/8″ – 26″
Schedules 10 through 160, STD, XH and XXH

ASTM A53 pipe (also referred to as ASME SA53 pipe) 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.

American Piping Products stocks a full range of A53 pipe (SA53 Pipe) in:

  • Grade B
  • NPS 1/8” to 26” diameter
  • Schedules 10 through 160, STD, XH and XXH


ASTM A53 pipe 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.

Looking for specific post-production services? See our full list.

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.

Chemical Requirements

[scode sid=’1411′]

Type S
 Type E Type F
resistance welded)
welded pipe)
Grade AGrade BGrade AGrade BGrade A
Carbon max. %0.250.30*0.250.30*0.3
Manganese %0.951.20.951.21.2
Phosphorous, max. %
Sulfur, max. %0.0450.0450.0450.0450.045
Copper, max.%0.400.400.400.400.4
Nickel, max. %0.400.400.400.400.4
Chromium, max. %0.400.400.400.400.4
Molybdenum, max. %
Vanadium, max. %
*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).

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%

Permissible Variations in Outside Diameter

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″ over1/64″ under1% over1%under

Tensile Requirements

Seamless and Electric-resistance-welded Continuous-Welded
Grade AGrade B
Tensile Strength, min., psi48,00060,00045,000
Yield Strength, min., psi30,00035,00025,000

Hydrostatic Testing

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 larger.

Degree of BendDiameter of Mandrel
For Normal A53 Uses9012 x nom dia. of pipe
For Close Coiling1808 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.

Required Markings on Each Length

(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.
Length of pipe

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