ASTM A500 Rectangular Tube

Rectangular tube is a hollow long steel material, also known as flat tube, flat square tube or square flat tube (as the name implies). When the bending and torsional strength are the same, the weight is lighter, so it is widely used in manufacturing mechanical parts and engineering structures.

ASTM A500 is a standard specification for seamless and weldable carbon structural steel published by ASTM International. ASTM A500 rectangular tube is a rectangular steel pipe that can be welded, riveted, or bolted for use in bridges or buildings and general structures.

Features and advantages of ASTM A500 rectangular tubes:

As a widely used structural material in the construction and engineering fields, ASTM A500 Rectangular tubes have the following significant features and advantages:

1. Excellent structural strength
Made by cold forming process, with higher yield strength and tensile strength (B-grade yield strength ≥ 290MPa)
Rectangular cross-section design provides better bending and torsion resistance
Particularly suitable for structural applications that bear multi-directional loads

2. High dimensional accuracy
Strict dimensional tolerance control (±0.5% outer diameter, ±10% wall thickness)
Right-angle edge design ensures precise docking during assembly
High surface flatness for easy subsequent processing and welding

3. Great design flexibility
Provide a variety of wall thickness options
Wide range of sizes
Special sizes can be customized according to project requirements

4. Strong construction convenience
Flat surface is easy to paint and anti-corrosion treatment
Right-angle design simplifies the connection node structure
Light weight but high strength, reducing transportation and installation costs

5. Outstanding economy
Compared with hot-rolled steel, the material utilization rate is higher
Cold forming process reduces production costs
Long size reduces the number of on-site joints

Tensile Properties of ASTM A500 Rectangular Tubes:

 

ASTM A500 Rectangular Tube
Minimum stretch(Mpa)	310	400	427	400
Yield Strength (Mpa)	269	317	345	250
Minimum elongation per 50.8mm, %D	25A	13B	21C	23B

Notes
A: Suitable for steel pipes with wall thickness (t) ≥ 3.05mm. For thinner steel pipes, the minimum elongation can be calculated by the following formula: Secondary length per 50.8mm = 56t+17.5, rounded to two decimal places.
B: Suitable for steel pipes with wall thickness (t) ≥ 4.57mm. For thinner steel pipes, the minimum elongation can be calculated by the following formula: Elongation per 50.8mm = 61t+12, rounded to two decimal places.
C: Suitable for steel pipes with wall thickness (t) ≥ 3.05mm. For thinner tubes, the minimum secondary length can be agreed with the manufacturer.

D: The specified minimum elongation is only a reference value for test experiments, not a technical standard for steel pipe trade.

Application of ASTM A500 rectangular tubes:

1. Building and steel structure
Building frame: used for beams, columns and supporting structures of high-rise buildings and industrial plants, providing excellent compression and bending resistance.
Roof truss system: suitable for large-span structures such as stadiums and airport terminals to ensure stability and load-bearing capacity.
Enclosure structure: as the supporting skeleton of curtain walls and roofs, it has both beauty and strength.

2. Bridges and infrastructure
Bridge structure: used for bridge main beams, guardrails, and supporting structures, with high seismic resistance and fatigue resistance.
Tunnel and subway engineering: as tunnel support and platform structure, adapt to complex geological conditions.

3. Machinery manufacturing and equipment
Engineering machinery: used for the frame of equipment such as cranes, excavators, conveyors, etc., providing high rigidity and wear resistance.
Automobile manufacturing: used for truck chassis and trailer structures, with both lightweight and high strength.
Agricultural machinery: such as tractor and harvester frames, adapt to high-load working environments.

4. Transportation
Railway vehicles: used for train carriages and rail sleeper support structures to improve durability.
Shipbuilding and marine engineering: used as ship hull reinforcement structure and offshore platform support, corrosion-resistant and impact-resistant.

5. Other industrial applications
Power and energy: used for transmission towers and solar brackets, adapting to harsh outdoor environments.
Furniture and decoration: high-end metal furniture and exhibition stand structures, both beautiful and load-bearing.

Go here to learn more about "ASTM A500 square tube"