ASTM A500 Square Steel Tube for Structral

Short Description:

Type: ASTM A500 Square tubing, ASTM A500 Rectangle Tubing
Specification: 2″ x 2″ – 12″ x 12″, WT.:120″, 180″, 188″, 250″, 313″, 375″, 500″, L.: 20′, 24′, 40′, 48′, Customized
Standard: ASTM A500, ASME SA500
Grades: Grade A ,Grade B ,Grade C,Grade D
End: Plain, Bevel, Screwed, Threaded
Coating: Black paint, anti-rust oil, varnished, galvanized, zinc coating.

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What is ASTM A500 Square Steel Tube?

ASTM A500 steel tube is a corrosion-resistant steel tube that can be used in construction applications. The steel tube specification is carbon steel tubing that is seamless and cold-formed. There are round square and rectangular pipes of this grade. ASTM A500 Steel Tube has 427MPa minimum tensile strength with 317MPa minimum yield strength. The ASTM A500 Steel Tube is the strongest in terms of tensile strength. ASTM A500 Steel Tube has the lowest tensile strength of 310MPa with a minimum yield strength of 228MPa. The ASTM A500 Schedule 40 Tube is one of the medium-ranging schedules and can hold good pressure and temperatures. There are different finishes to the pipes and the unfinished is the ASTM A500 Black Steel Tube. The composition includes carbon, manganese, sulfur, phosphorus, and copper when specified. The chemical combination is the reason for the ASTM A500 Tube strength and corrosion resistance. The pipes can also be welded with most welding methods but caution has to be taken to preheat the pipes before welding through high-temperature procedures such as electric arc welding to avoid welding cracks. Post-weld heat treatment is also necessary after high-temperature welding.

Tolerance of ASTM A500 Square Steel Tube

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

Chemical Analysis of ASTM A500 Square Steel Tube

C Si Mn P S Yield Strength Tensile Strength Elongation min
Max% Max% Max% Max% Max% MPa MPa 2in(50.8mm)
Grade A 0.26 - - 0.035 0.035 230 310 25
Grade B 0.26 - - 0.035 0.035 290 400 23
Grade C 0.23 - 1.35 0.035 0.035 315 425 21
Grade D 0.23 - 1.35 0.035 0.035 250 400 23

ASTM A500 specification covers welded and seamless carbon steel tubing in round, square, rectangular, and “special” shapes for construction and structural purposes. BESTAR supplies and stock square, rectangle, round, and specially shaped electric resistance welded (ERW) carbon steel tubing to meet ASTM A500 Grade A, Grade B, and Grade C used for structural applications.

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.


Yield (min) 

Tensile (min) 

Elongation (min) 

Grade A 39,000 psi 45,000 psi Determined by wall
Grade B 46,000 psi 58,000 psi Determined by wall
Grade C 50,000 psi 62,000 psi Determined by wall

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.



Tensile (min)

Elongation (min)

Grade A 33,000 psi 45,000 psi Determined by wall
Grade B 42,000 psi 58,000 psi Determined by wall
Grade C 46,000 psi 62,000 psi Determined by wall

Specification Notes

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

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  • Size Chart of ASTM A500 Square Steel Tube

    Sizes by MM  (diameter) Thickness Sizes by MM  (diameter) Thickness
    mm mm mm mm
    16mm×16mm 0.4mm~1.5mm 130mm×130mm 4mm~8mm
    18mm×18mm 0.4mm~1.5mm 140mm×140mm 6mm~10mm
    20mm×20mm 0.4mm~3mm 150mm×150mm 6mm~10mm
    22mm×22mm 0.4mm~3mm 160mm×160mm 6mm~10mm
    25mm×25mm 0.6mm~3mm 180mm×180mm 6mm~12mm
    30mm×30mm 0.6mm~4mm 200mm×200mm 6mm~30mm
    32mm×32mm 0.6mm~4mm 220mm×220mm 6mm~30mm
    34mm×34mm 1mm~2mm 250mm×250mm 6mm~30mm
    35mm×35mm 1mm~4mm 270mm×270mm 6mm~30mm
    38mm×38mm 1mm~4mm 280mm×280mm 6mm~30mm
    40mm×40mm 1mm~4.5mm 300mm×300mm 8mm~30mm
    44mm×44mm 1mm~4.5mm 320mm×320mm 8mm~30mm
    45mm×45mm 1mm~5mm 350mm×350mm 8mm~30mm
    50mm×50mm 1mm~5mm 380mm×380mm 8mm~30mm
    52mm×52mm 1mm~5mm 400mm×400mm 8mm~30mm
    60mm×60mm 1mm~5mm 420mm×420mm 10mm~30mm
    70mm×70mm 2mm~6mm 450mm×450mm 10mm~30mm
    75mm×75mm 2mm~6mm 480mm×480mm 10mm~30mm
    76mm×76mm 2mm~6mm 500mm×500mm 10mm~30mm
    80mm×80mm 2mm~8mm 550mm×550mm 10mm~40mm
    85mm×85mm 2mm~8mm 600mm×600mm 10mm~40mm
    90mm×90mm 2mm~8mm 700mm×700mm 10mm~40mm
    95mm×95mm 2mm~8mm 800mm×800mm 10mm~50mm
    100mm×100mm 2mm~8mm 900mm×900mm 10mm~50mm
    120mm×120mm 4mm~8mm 1000mm×1000mm 10mm~50mm
    125mm×125mm 4mm~8mm

    Application of ASTM A500 Square Steel Tube

    - Structural Supports
    - Building columns
    - Highway Signs
    - Oil Field Services
    - Communication Towers
    - Oil Refineries
    - Petrochemicals
    - Power Generation (Nuclear/Thermal)
    - Steel
    - Sugar
    - Boiler Equipment
    - Pressure Vessels
    - General Engineering Purposes

    We are a professional Carbon Steel Pipe manufacturer. We provide Carbon Steel Pipe of different sizes as well as steel pipes and pipe fittings of various specifications.

    Our Advantages:
    1.China-leading product service provider and exporter of steel pipe
    2.Competitive price and quality from our own factory
    3.One-stop Resource Integration
    4.Passed the ISO9001, CE, SGS certification every year
    5.Best service with 24-hour response
    6.Flexible payment methods
    7.Strong production capacity
    8.Fast delivery and standard export packaging

    If you would like to inquire about any steel products, please feel free to contact us:sales@bestartubes.com20230927171424 H6RATC2~S}BLIMQ(H@(JOU5

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