ASTM A53 Steel Pipe Specifications
NPS 1/8″ – 26″
Schedules 10 through 160, STD, XH and XXH
ASTM A53 Steel Pipe (also referred to as ASME SASTM A53 Steel 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.

China Piping Products stocks a full range of ASTM A53 Steel Pipe (ASME SA53 Steel Pipe) in:
Grade B
NPS 1/8” to 26” diameter
Schedules 10 through 160, STD, XH and XXH
ASTM A53 Steel 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.





















ASTM A53 Steel Pipe testing

Chemical Requirements

Type S
  Type E   Type F
resistance welded)
welded pipe)
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).

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″ over 1/64″ under 1% over 1%under

Tensile Requirements

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 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.



ASTM A53 Steel Pipe/ASME SA53 Steel Pipe

Mechanical Tests Specified

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.

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

General Information

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.