ASTM A36 Hollow Section Standard Sizes and Dimensions

What is ASTM A36 Hollow Section?

ASTM A36 Hollow Section refers to hollow structural steel tubes manufactured using ASTM A36 carbon structural steel. These tubes typically come in square (SHS) and rectangular (RHS) profiles and are widely used in construction, structural frameworks, mechanical fabrication, and infrastructure projects.

A36 carbon structure pipe,A36 steel pipe is mainly used in various gas purification systems,transport of gases and liquids without corrosion property.

ASTM A36 square hollow section with four edges in equal,these hollow sections can be supplying as A36 welded square hollow section or A36 seamless square hollow section.Seamless type cost higher than welded type.EN 10204 3.1 material certificate shall be along with these ASTM A36 square hollow section.
 

Advantages of ASTM A36 Hollow Sections

1.Good strength and plasticity
ASTM A36 square steel pipe has high strength and good plasticity, which can withstand large loads while maintaining good ductility and toughness. This enables ASTM A36 square steel pipes to exhibit excellent stability and reliability when subjected to external forces such as pressure and impact. ‌

2.Excellent corrosion resistance
ASTM A36 square steel pipe has excellent corrosion resistance and can resist various common corrosive media, extending its service life.

3.Good welding performance and processability
ASTM A36 square steel pipes have good welding performance and processability, making the manufacturing process more convenient and efficient. ‌

Chemical Composition of ASTM A36 Hollow Sections

ASTM A36 steel contains relatively low carbon content, which improves ductility and weldability.

Element	Content (%)
Carbon (C)	≤ 0.26
Manganese (Mn)	0.60 – 1.20
Phosphorus (P)	≤ 0.040
Sulfur (S)	≤ 0.050
Silicon (Si)	≤ 0.40

These chemical elements ensure the steel has stable mechanical performance and good forming capability.

Mechanical Properties
ASTM A36 hollow sections provide reliable mechanical performance for structural applications.

Property	Value
Yield Strength	≥ 250 MPa (36 ksi)
Tensile Strength	400 – 550 MPa
Elongation	≥ 20%
Density	7.85 g/cm³

 

Standard Sizes of ASTM A36 Hollow Sections

ASTM A36 hollow sections are available in a wide range of dimensions.

Shape	Size Range	Wall Thickness
Square Tube	20 × 20 mm – 500 × 500 mm	1.2 – 25 mm
Rectangular Tube	30 × 20 mm – 600 × 400 mm	1.2 – 25 mm
Length	6 m / 12 m or customized	—

 

Conclusion

ASTM A36 hollow sections are widely used structural steel products known for their reliable strength, excellent weldability, and cost efficiency. Available in square and rectangular profiles, they are suitable for a broad range of construction, infrastructure, and fabrication applications.

Because of their high structural efficiency and versatile performance, ASTM A36 hollow sections remain one of the most practical solutions for modern steel structures.