ASTM A500 (ASME SA500)

ASTM A500 standard specification covers carbon steel, cold formed welded and seamless structural tube in both round and shaped forms.

ASTM A500 Black Steel Pipe

round and shaped steel cold formed welded and seamless carbon steel structural pipe.

Standard:  ASTM A500 for Cold-Formed Welded and Seamless Carbon Steel Structural Tubing in Rounds and Shapes.

ASTM A500 structural pipe

ASTM A500 is a standard specification for cold-formed welded structural tubing produced to round nominal pipe sizes.

Main purpose:

ASTM A500 round structural pipe

ASTM A500 structural pipe is welded pipe sized tubing made from flat-rolled steel, formed through a roller system and welded using electric-resistance welding. Longitudinal butt joints of welded tubing shall be welded across its thickness in such a manner as to assure the structural design strength of the tubing section.


In addition, based on customer requirements, which can supply other grades and specifications of steel pipe.

Processing: steel shall be in accordance with one or more of the processing: open-hearth, blowing oxygen, or electric furnace steelmaking, casting of different grades of steel in order, steel producers should determine the intermediate material using conventional procedures removed, a clear separation of a Level.

Manufacturing: produced by seamless or welded steel pipe, welded pipe by rolling made ​​by resistance welding.

Structural design strength of the longitudinal direction of the pipe, the docking application tube is a method of determining the through its thickness to weld.

Chemical Component(%)
 Grade  C  M  P  S  Cu
 Gr.A  0.26  1.35  0.035  0.035  0.20
 Gr.B  0.30  1.40  0.045  0.045  0.18
 Gr.C  0.23  1.35  0.035  0.035  0.20
 Gr.D  0.27  1.40  0.045  0.045  0.18
Mechanical Properties Min (MPa)
 Grade  Tensile Strength  Yield Strength  Elongation
 Gr.A  310  230  25
 Gr.B  400  290  23
 Gr.C  425  315  21
 Gr.D  400  250  23
Impact test requirements for ASTM A500 Gr.C

Impact test machine

Mixture Requirements
According to ASTM rules, all tubing must have the chemical mixtures of carbon, manganese, phosphorus, sulfur and copper present. In addition, the steel produced must be done by open-hearth, basic-oxygen or electric-furnace melting methods. It is not enough to have the correct chemicals mixed in the tubing; materials must also undergo specific welding methods in order to be approved by ASTM A500.

Welding Procedures
In addition to the three aforementioned steel-producing methods, tubing must also be welded using flat-rolled steel. The flat-rolled steel should be formed into a tube using the electric-resistance welding process. Using the electric-resistance welding process will assist the material in passing the tension and flattening test that evaluates the sturdiness of the piece.

ASTM rules require that the longitudinal butt joint of the tubing be thickly welded in order to assure the secure structural design of the piece. ASTM will not approve tubing that has a weak joint because such weakness may pose a problem to the entire structure. Thousands of structures built with poor still joints would be in danger of collapsing if the ASTM did not uphold this regulation.

Before the manufacturer is given permission to market products, all tubing must be inspected by an ASTM representative. The purpose of the inspection is to assure conformance to structure requirements; tubing that fails to pass inspection must either be corrected or discarded. In addition, the appearance of tubing must be professional and free from defects; it should not, for example. be severely burned or have bumps or blotches of steel in any one place.

A500 Grade A, B & C Tubing

Sunny Steel supply square, rectangle, round and special shaped electric resistance welded (ERW) carbon steel tubing to meet ASTM specifications A500 Grade A, Grade B and Grade C that is often used in structural applications. The purpose and strength levels required will determine which grade is required.

Square & Rectangle Tubing

Below are physical properties required to meet the three grades that we produce ASTM A500 square, rectangle and special shaped tubing to. A flattening test is not a standard requirement for non-round tubing produced to A500.

Grade Yield (min)  Tensile (min) 
Grade A  39,000 psi  45,000 psi 
Grade B  46,000 psi  58,000 psi 
Grade C  50,000 psi  62,000 psi 

Round Tubing

Below are physical properties required to meet the three grades that we produce ASTM A500 round tubing to. A flattening test is also a standard requirement for round tubing produced to the A500 specification.

Grade Yield (min) Tensile (min) 
Grade A  33,000 psi  45,000 psi 
Grade B  42,000 psi  58,000 psi
Grade C  46,000 psi  62,000 psi 

Specification Notes

  • According to ASTM A500, the weld seam location for square, rectangle and other special shaped tubing shall not be located within the corner radius unless specified by the customer or manufacturer.
  • Under ASTM A500, the corner radius for square and rectangular tubing shall not exceed three times the corner radius.
  • As a standard under ASTM A500, electric resistance welded tubing is normally provided without removal of inside flash. If flash control is required, please specify at time of quotation or order placement.
  • ASTM A847 is a related structural specification that covers high strength low alloy atmospheric corrosion resistant steel tubing. Please refer to the ASTM A847 page for more information.

Weled steel pipe specification, Standard and identification

Welded steel pipe (steel pipe manufactured with a weld) is a tubular product made out of flat plates, known as skelp, that are formed, bent and prepared for welding.

Hot dip galvanizing

Galvanized pipe process characteristics

What is Galvanized Steel Pipe? Galvanized steel can be made into a strong plumbing or tubing material -- one that resists corrosion from exposure to water or the elements. It has been used used for water-supply pipes or as a strong tubing for outdoor applications.


Our team are highly trained and experienced in servicing and producing all types of steel supplies. Whether you've got a large construction project, or need parts for industrial machinery, our team of steel fabrication consultants will ensure that your project is provided with the parts you need, when you need them.

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