ASTM A500 Pipe


ASTM A500 Hollow Section

UNIACERO is proud to present the ASTM A500 Carbon Steel Structural Tubing, a prime example of our commitment to delivering the best. ASTM A500 is a standard specification for cold-formed welded and seamless carbon steel structural tubing in various shapes, including rounds and rectangles. With UNIACERO, you can expect tubing with both maximum and minimum wall thicknesses, providing flexibility for different construction requirements. Its versatile application makes it perfect for structures such as bridges, buildings, and beyond. Beyond mere standards, what sets our product apart is its quality, durability, and trustworthiness. When you choose UNIACERO’s ASTM A500, you’re investing in reliability, aesthetics, and unmatched structural integrity.

ASTM A500 Specification

Our ASTM A500 Carbon Steel  Structural Tubing comes with rigorous specifications to ensure our clients get nothing but the best. Our tubing, whether it takes the shape of round structural tubing or specialized forms within distinct structural tubing grades, is meticulously fashioned to not only meet but exceed the highest industry standards. Manufactured from flat-rolled steel using electric-resistance welding, these tubings are produced in both welded and seamless varieties. Whether you’re considering construction projects or general structural purposes, our tubing stands out. It’s made to precise dimensions with a specified wall thickness of up to 0.625 in. (15.88 mm) or less. Opt for Grade D for heat treatment, and rest easy knowing that all our products are manufactured to ensure the structural design strength of the tubing section.

Production StandardASTM A500
Manufacturing ProcessesERW (Electric Resistance Welding)
SSAW (Spirally Submerged Arc Welding)
LSAW (Longitudinal Submerged Arc Welding)
SMLS (Cold Drawn Seamless)
Outside Diameter13.7mm – 2235mm (1/4″ – 88″)
Wall Thickness1.65mm – 25.4mm
Pipe Length1.5 – 18 meters
Steel GradeASTM A500 Grade AASTM A500 Grade C
ASTM A500 Grade BASTM A500 Grade D
Corrosion PreventionLacquer, Varnish, Oiling, Galvanizing
End ProcessesSquare Cut, Bevelling, Threading, Grooving
Further ProcessingWelding, Bending, Hole Drilling, Punching, Swaging, Tapering, Flaring, Expanding

ASTM A500 Dimension Table


Precision is our middle name at UNIACERO, and our ASTM A500 Carbon Steel Structural Tubing’s dimensions are a testament to that. For round structural tubing, outside diameters of 1.900” (48.26mm) or smaller have a precise variation of ±0.5%, while those with nominal ODs of 2” (50.8mm) and larger have a variation of ±0.75%. Square and rectangular structural tubing dimensions are measured across the flats, and we ensure that specified dimensions adhere strictly to the given plus/minus allowances.

Our commitment to accuracy extends to wall thickness, ensuring that it meets the specified standards for a diverse range of structural applications. With strict adherence to ASTM standards, our tubing dimensions are crafted to meet specific requirements, including those for lighter specified wall thicknesses or special shape structural tubing. Whether used in bolted construction, seamless carbon steel structures, or other applications, our ASTM A500 tubing dimensions are tailored to meet the demands of various projects.

Square Hollow Section Thickness: 1.000 in. [25.4 mm] or less
Size (mm)
20 x 2080 x 80180 x 180
25 x 2590 x 90200 x 200
30 x 30100 x 100225 x 225
38 x 38110 x 110240 x 240
40 x 40120 x 120250 x 250
50 x 50125 x 125300 x 300
60 x 60130 x 130350 x 350
65 x 65140 x 140400 x 400
70 x 70150 x 150450 x 450
75 x 75160 x 160500 x 500
Rectangular Hollow Section Thickness: 1.000 in. [25.4 mm] or less
Size (mm)
20 x 30120 x 40250 x 75
40 x 20120 x 50250 x 100
40 x 25120 x 60250 x 150
40 x 30120 x 80250 x 200
50 x 25120 x 100300 x 100
50 x 30140 x 60300 x 150
50 x 40140 x 80300 x 180
60 x 30150 x 50300 x 200
60 x 40150 x 75400 x 200
70 x 50150 x 100400 x 300
80 x 40160 x 60400 x 350
80 x 50160 x 80450 x 250
80 x 60180 x 120500 x 200
90 x 60180 x 140500 x 300
100 x 40200 x 50500 x 400
100 x 50200 x 60600 x 200
100 x 60200 x 80600 x 300
100 x 80200 x 100600 x 400
Steel Pipe Dimensions Chart ANSI B36. 10 & 36.19
Nominal Pipe SizeOutside Diameter (mm)Nominal Wall Thickness Schedule
1 1/43242.21.652.772.973.563.564.854.85
1 1/24048.31.652.773.183.683.685.085.08
2 1/265732.113.054.785.
3 1/290101.
Nominal Pipe SizeOutside Diameter (mm)Nominal Wall Thickness

Chemical Requirements of ASTM A500

When it comes to the composition of our ASTM A500 Carbon Steel Structural Tubing, we’re transparent and stringent. The chemical composition of our tubing aligns with the ASTM A500 standard. We use materials that primarily consist of iron, enhanced with added elements like carbon, manganese, phosphorus, sulfur, and copper. This combination guarantees the durability and performance of our products, making sure they are consistently up to the mark.

In addition, we utilize suitable measuring devices to ensure the accuracy of these components. This precision in chemical composition contributes to the reliability and suitability of our tubing for diverse structural applications, including bolted construction and seamless carbon steel structures.

Chemical Requirements
ElementComposition, %
Grades B and DGrade C
Carbon, maxA0.260.300.230.27
Manganese, maxA1.351.401.351.40
Phosphorus, max0.0350.0450.0350.045
Sulfur, max0.0350.0450.0350.045
Copper, minB0.
A  For each reduction of 0.01 percentage point below the specified maximum for carbon, an increase of 0.06 percentage point above the specified maximum for manganese is permitted, up to a maximum of 1.50 % by heat analysis and 1.60 % by product analysis. B  If copper-containing steel is specified in the purchase order.

Mechanical Requirements of ASTM A500

Mechanical strength defines the quality of any structural tubing. Our ASTM A500 Carbon Steel Structural Tubing boasts impressive tensile strength, showcasing its capability to withstand stretching stress effectively. The ultimate tensile strength of our product is derived from extensive testing and evaluations, ensuring that A500’s performance aligns with your project’s demands.

Tensile Requirements
Round, Square, Rectangular, and Special Tubular Shapes
Mechanical PropertiesGrade BGrade CGrade D
Tensile strength, min, psi [MPa]58 00062 00058 000
Yield strength, min, psi [MPa]46 00050 00036 000
Elongation in 2 in. [50 mm], min, %C23A21B23A

A   Applies to specified wall thicknesses (t ) equal to or greater than 0. 180 in. [4.57mm]. For lighter specified wall thicknesses, the minimum elongation values shall be  calculated  by the formula:  percent  elongation  in 2  in.  [50  mm]  =  61t +  12, rounded to the nearest percent. For A500M use the following formula: 2.4t + 12, rounded to the nearest percent.

B    Applies to specified wall thicknesses (t ) equal to or greater than 0. 120 in. [3.05mm]. For lighter specified wall thicknesses, the minimum elongation values shall be by agreement with the manufacturer.

C    The minimum elongation values specified apply only to tests performed prior to shipment of the tubing.

Steel Grades in ASTM A500

UNIACERO’s ASTM A500 Carbon Steel Structural Tubing is available in various grades to cater to different requirements. Our tubing is available in four grades (Grade A, Grade B, Grade C, and Grade D), each with specific requirements, including minimum yield strength and outside dimensions. Grade A exhibits tensile strength of 45,000 psi and yield strength of 39,000 psi. For projects demanding more strength, Grade B, C, and D are available with their respective strengths and elongations. Each grade is meticulously crafted to serve specific needs, providing you with a robust and reliable solution for various structural applications.

Production Tolerance of ASTM A500

Engineers often wonder why there are significantly fewer options for A53 pipes compared to A500 rounds.

A53 pipes are designated using a nominal pipe diameter in inches, along with one of three scheduled wall thicknesses. They are sized this way to accommodate A53 pipes’ intended purpose—transporting pressurized steam, air, or water—requiring compatibility with standardized fittings and valves.

Such requirements are not applicable to A500 tubes, allowing for more precise and efficient designation. A500 rounds include the outside diameter and wall thickness in inches, measured to three decimal places. For example, when using an A500 round for a building column, an HSS8.625×0.322 can be specified with an outside diameter (OD) tolerance of +/-0.75% and a wall tolerance of +/-10%. In contrast, the A53 equivalent, an 8-inch standard pipe, has an OD tolerance of +/-1% and a wall tolerance of -12.5%. This highlights that A500 rounds have superior OD and wall tolerances.

Choose A500 rounds for your structural tubing needs, benefiting from their superior tolerances and the flexibility they offer in meeting specific requirements for wall thickness and outside diameter.