ASTM A53 / ASME SA 53 carbon steel pipes are available in the size range 1/4 to 30 inch / schedule 10 to 160, both in seamless and welded execution, black and hot dip galvanized (HDG). These pipes are largely used to convey fluids at low / medium pressures such as oil, gas, steam, water, air and also for mechanical applications (even if ASTM A500 pipes are preferred in this case). A53 pipes can be welded, flanged and shaped as necessary (coiling, bending). There are two types of ASTM A53 pipes:

  • type F: continuos welding / longitudinal furnace butt welded (this type is not suited for flanging)
  • type S: seamless pipe (hot rolled and cold finished)
  • type E: erw pipe 

In terms of materials, the standard foresees two grades: ASTM A53 grade A and grade B. A53 gr. B pipes are more common.

ASTM A53 (source: ASTM)

This specification covers seamless and welded black and hot-dipped galvanized steel pipe in NPS 1/8 to NPS 26. The steel categorized in this standard must be open-hearth, basic-oxygen or electric-furnace processed and must have the following chemical requirements: carbon, manganese, phosphorus, sulfur, copper, nickel, chromium, molybdenum, and vanadium. The tubing shall undergo a seamless or welding process. Tension, bend, and flattening tests shall be performed to make sure that it must adhere to the mechanical properties of the standard. The hydrostatic test shall be applied, without leakage through the weld seam or the pipe body. Nondestructive electric test shall be made to make sure that the full volume of the pipe must be in accordance with the standard. The purchaser shall have the right to perform any of the inspections and tests set forth in this specification where deemed necessary to ensure that the pipe conforms to the specified requirements. This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

1. Scope

1.1 This specification covers seamless and welded black and hot-dipped galvanized steel pipe in NPS 1/8 to NPS 26 [DN 6 to DN 650] (Note 1), inclusive, with nominal wall thickness (Note 2) as given in Table X2.2 and Table X2.3. It shall be permissible to furnish pipe having other dimensions provided that such pipe complies with all other requirements of this specification. Supplementary requirements of an optional nature are provided and shall apply only when specified by the purchaser. Note 1—The dimensionless designators NPS (nominal pipe size) [DN (diameter nominal)] have been substituted in this specification for such traditional terms as “nominal diameter,” “size,” and “nominal size.” Note 2—The term nominal wall thickness has been assigned for the purpose of convenient designation, existing in name only, and is used to distinguish it from the actual wall thickness, which may vary over or under the nominal wall thickness.

1.2 This specification covers the following types and grades: 1.2.1 Type F—Furnace-butt-welded, continuous welded Grade A, 1.2.2 Type E—Electric-resistance-welded, Grades A and B, and 1.2.3 Type S—Seamless, Grades A and B. Note 3—See Appendix X1 for definitions of types of pipe.

1.3 Pipe ordered under this specification 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 suitable for forming operations involving coiling, bending, and flanging, subject to the following qualifications:

1.3.1 Type F is not intended for flanging.

1.3.2 If Type S or Type E is required for close coiling or cold bending, Grade A is the preferred grade; however, this is not intended to prohibit the cold bending of Grade B pipe.

1.3.3 Type E is furnished either nonexpanded or cold expanded at the option of the manufacturer.

1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.

1.5 The following precautionary caveat pertains only to the test method portion, Sections 7, 8, 9, 13, 14, and 15 of this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory requirements prior to use.

1.6 The text of this specification contains notes or footnotes, or both, that provide explanatory material. Such notes and footnotes, excluding those in tables and figures, do not contain any mandatory requirements.

 ASTM A53 pipe specification.pdf


(Carbon steel grade S, E or F depends on the mix of elements and the manufacturing process - seamless or welded) 

  Type S
Type E Type F
  (erw) (furnace-welded)
CHEMICAL COMPOSITION 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


The tolerances for A53 pipes are set in the table below:

  • diameter: see the values on the table
  • wall thickness:the wt of the pipe shall be, at any point, not less than the nonimal pipe size minus 12.5% (a wt of NPS -13% would not be, for instance, acceptable)
  • weight per foot: + / - 10% 

Testing should be of 1 / 25 tons for A53 pipes below 1 1/2 inch; 1 / 50 tons for pipes from 2 inches and above.

Tensile requirements and tolerances ASTM A53 pipe

(Source: Trouvay & Cauvin - Piping Equipment 2011 aka "Blue Book")


  • Pipe schedule below 0.500 inch and sch. STD / XS pipes: plain or bevelled ends
  • Pipe schedule above 0.500 inch and sch. XXS: Squared cut plain ends 

If pipes are supplied with threaded ends, protection for threads is mandatory for pipes above 4 inches.


Each lenght of pipe (or bundle for smaller diameters) shall have the following markings applied:

  • Manufacturer name
  • A53 type (S, E, F)
  • Diameter and schedule (from 10 to 160 and XXS)
  • Designation "ASTM A53"
  • Pipe lenght
  • Heat number

It is frequent to find pipes compliant to mulitple standards at the same time: A53/A106/API 5L Gr. B (in this case the marks reports any covered standards).


Hot-dip galvanized ASTM A53 steel pipes are made out of wrought steel and have an external and internal coating of zinc. Galvanized steel pipes are widely used in water and sewarage applications, fire fighting and plumbing systems. This type of pipes have long lasting durability, improved resistance to corrosion vs black steel, relatively cheap price and good thoughness. On the other side, galvanized pipes are heavy, difficult to repair and tend to develop blockages over the course of time. The zinc coating should be between 1.6 and 1.8 oz per square foot.


ERW PIPES (1/8-72")

ERW Pipe Mill Country
American Steel Pipe USA
Atlas Tube USA
Boomerang USA
Independence Tube USA
Northwest Pipe USA
Paragon USA
Southland Tube USA
Stupp Corporation USA
Tenaris Italy
TexTube USA
US Steel USA
Welspun USA
Wheatland USA
Evraz  Canada
Husteel South Korea
Hyundai   South Korea
JFE  Japan
JV Nippon Sumitomo  Japan
Pytco  Mexico
Salzgitter Mannesmann  Germany
Seah Steel  South Korea
Tata  India / UK


DSAW PIPES (24-72")

DSAW Pipe Mill Country
Berg Steel USA
Confab  Brazil
Durabond  USA
Evraz  Canada
Husteel   South Korea
Hyundai South Korea
JFE  Japan
ILVA  Italy
JV Nippon Sumitomo  Japan
Seah Steel   South Korea
Sumitomo Corp. Japan
Tata Steel (ex-Corus) India / UK



Looking for additional info? Contact the pipingonline expert team

Useful links: ANSI | ASME | ASTM | API | MSS | BS | DIN | ISO