Square Tube
Square Steel Tube is a structural-grade, welded tubing manufactured to ASTM A513 or A500 Grade B specifications, depending on size and wall thickness. Its uniform shape and strength make it ideal for load-bearing frameworks, supports, and architectural structures requiring precision and durability.
Steel Square Tube is a versatile structural component widely used in general fabrication, construction, and equipment repair. Known for its high strength-to-weight ratio and rigidity, it offers excellent support in both horizontal and vertical load-bearing applications, making it a staple in metalworking and industrial projects.
Specifications
Chemistry (A500)
Carbon: 0.3% max, Copper: 0.18% max, Iron: 99% min, Sulfur: 0.063% max, Phosphorus: 0.05% max
Chemistry (A513)
Carbon: 0.17 - 0.23%, Manganese: 0.3 - 0.6%, Phosphorus: 0.04% max, Sulfur: 0.05% max
Measurement Guide
Outside Diameter (OD) X Wall Thickness X Length
PageTitle
Steel Square Tube, ASTM A500 and A513 Structural Tubing, Fabrication and Construction Use
Specifications
ASTM A513 (1020-1026)
ASTM A500 Grade B
ASTM A500 Grade B
Finishes
A513 - Dark Blue/Black, smooth slight oil coating
A500 - Blue/Dark Gray, slightly grainy, dry finish
A500 - Blue/Dark Gray, slightly grainy, dry finish
Material Properties
High strength and rigidity compared to angles or channels
Good weldability
Good machinability and grinding properties
Fair bending and forming capabilities
Poor corrosion resistance
Good weldability
Good machinability and grinding properties
Fair bending and forming capabilities
Poor corrosion resistance
Mechanical Properties
Tensile Strength = 72 ksi (A513), 58 ksi (A500)
Yield Strength = 62 ksi (A513), 46 ksi (A500)
Elongation in 2" = 10% (A513), 23% (A500)
Ultimate Tensile Strength (A500) = 45,000 - 62,000 psi
Yield Strength (A500) = 39,000 - 50,000 psi
Yield Strength = 62 ksi (A513), 46 ksi (A500)
Elongation in 2" = 10% (A513), 23% (A500)
Ultimate Tensile Strength (A500) = 45,000 - 62,000 psi
Yield Strength (A500) = 39,000 - 50,000 psi
Applications
Structural framework and support columns
Truck beds, trailers, and automotive frames
Building construction and manufacturing
Fencing, gates, and railings
Machine parts, racks, and shelving
Bridges, safety rails, and conveyor systems
Truck beds, trailers, and automotive frames
Building construction and manufacturing
Fencing, gates, and railings
Machine parts, racks, and shelving
Bridges, safety rails, and conveyor systems
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