ASTM/ASME A53/SA53 Seamless and Welded Standard Steel Pipe

Domestically produced welded and seamless steel pipe for general processing applications.

U. S. Steel Tubular Products ASTM/ASME A53/SA53 seamless and welded steel pipe is a general, all-purpose pipe used in generator plants, refineries, compressor stations, natural gas transmission, and steam conduction. It is acceptable for welding, flanging, and bending.

Our steel is locally sourced, developed and produced which means our customers are assured of the highest quality standards and a local, concerned customer service presence invested in the success of your project. U. S. Steel has control over every step of the pipe manufacturing process, from melt to final product. We manufacture our tubular products at several U.S.-based facilities that produce high-quality tubular products with low-residuals in a wide range of strength levels with superior toughness.

A53 Comparative Specifications

ASTM Specification 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. U. S. Steel Tubular Products does not produce galvanized pipe.

Mechanical Properties – Tensile Requirements

Seamless and ERW Grade A Grade B
Tensile Strength, min, psi   48,000 60,000
Yield Strength 30,000 35,000

Chemical Requirements for A53

Seamless and ERW    C max % Mn max % P max % S max %
Grade A 0.25 0.95 0.05 0.045
Grade B 0.30 1.20 0.05 0.045
  • Testing Requirements for seamless and welded API 53 steel pipe
    • Hydrostatic Testing test pressures for plain and threaded and coupled pipe are specified. Hydrostatic pressure shall be maintained for not less than 5 seconds for all sizes of seamless and ERW pipe.
    • Mechanical Tests:
      • Tensile Test: Two transverse tests required on the ERW for NPS 8 and larger, one across the weld and one opposite the weld.
      • Flattening Test: On ERW for NPS 2 and larger, STD and XS wall (not required for XXS pipe)
      • Bending Test (cold): For NPS 2 and under, XS wall and under; for NPS 1-1/4 and under, XXS wall
        Degree of Bend   Diameter of Mandrel
      For normal A53 users  90 12 x nom. diameter of pipe
      For Close Coiling 180 8 x nom. diameter of pipe
    • Number of Tests: Seamless and Electric Resistance Weld (ERW) – bending, flattening, tensile on one length of pipe from each lot of 500 lengths, or less, of each pipe size.
  • Permissible Variations for A53 steel pipe
    • Wall thickness: The minimum wall thickness at any point shall not be more than 12.5% under the nominal wall thickness specified.
    • Weights per foot are plus or minus 10%
    • Outside diameter: Outside diameter at any point shall not vary from standard specified more than:
    NPS Over Under
    1-1/2 and smaller   +1/64” -1/64”
    2 and larger +1% -1%
  • Lengths of A53 steel pipe
    U. S. Steel Tubular Products A53 seamless and welded steel pipe is produced in random lengths 16’ – 22’ or 32’ – 44’, in multiple lengths, and in specific cut lengths.
  • Marking Requirements
    Rolled, die-stamped, ink-printed, or stenciled (manufacturer’s option).
    • Manufacturer’s name, brand, or trademark
    • Size and wall
    • Steel grade
    • ASTM A53

U. S. Steel Tubular Products A53 Seamless and Welded Steel Distributors

U. S. Steel Tubular Products are available through authorized distributors across North America. See our complete U. S. Steel Tubular Products Standard & Line Pipe Distributor list here.

U. S. Steel Certifications

U. S. Steel Tubular Products electric-welded and seamless pipe facilities meet the internationally recognized quality system requirements of ISO9001 and API Q1 and our seamless facilities hold PED certifications. See the complete list of U. S. Steel Tubular Products certifications.

For pipe sizes and grades not found in the section above, please contact U. S. Steel Tubular Products at 877-893-9461 with your inquiry.