How to select square and rectangular tubes？

How to select square and rectangular tubes？

Square and rectangular tubes are the collective name for square tubes and rectangular tubes, that is, steel tubes with equal and unequal sides. It is made of strip steel through process treatment. Generally, strip steel is unpacked, flattened, curled, and welded into round tubes, which are then rolled into square tubes and then cut to the required length.

Choose the right square and rectangular tube according to your needs

1. Material selection: Commonly used materials for rectangular tubes include steel, aluminum, stainless steel, etc. According to the specific application environment and requirements, select the corresponding materials. Steel has the characteristics of high strength, wear resistance and corrosion resistance, and is suitable for places with high load-bearing requirements. Aluminum is light, easy to process, and resistant to oxidation, and is suitable for places with lighter requirements. Stainless steel has the characteristics of high temperature resistance and corrosion resistance, and is suitable for special environments.
2. Size selection: Choose the appropriate size according to your specific needs. The size of square rectangular tubes is usually determined by two parameters: width and height. Common specifications include 25x25mm, 50x50mm, 100x100mm, etc. It is necessary to consider the space restrictions of the place of use and the load-bearing requirements of the specific application.
3. Thickness selection: The thickness of the square tube determines its load-bearing capacity and bending resistance. The thicker the thickness, the higher the strength, and is suitable for places with higher load-bearing requirements. Common thicknesses include 1.5mm, 2.0mm, 3.0mm, etc., which can be selected according to specific needs.
4. Surface treatment: Square and rectangular pipes are usually surface treated to increase their anti-rust and anti-corrosion capabilities. Common surface treatment methods include hot dip galvanizing and spraying. Select the appropriate surface treatment method based on the specific environment and requirements.
5. Quality certification: When purchasing, please ensure that the square pipe meets relevant standards and quality certification requirements to ensure its reliable quality.
6. Price comparison: While considering the above factors, you also need to compare the prices of square and rectangular tubes from different suppliers or brands, and consider the final purchase based on cost performance.

How to identify inferior square and rectangular pipes

1. Look at its folding condition. Inferior square and rectangular pipes are prone to folding. We can see some folding lines on the outside of the pipe, which fully indicates that the product is easy to fold. The reason why low-quality products have many fold lines is generally because manufacturers pursue high output and high efficiency when producing products, resulting in a large amount of processed products. Due to the large amount during rolling, creases will inevitably appear. If you buy these square tubes, these broken wires will break easily. Therefore special attention must be paid.
2. Depends on the surface appearance of the product. The surface of inferior products will be uneven and feel numb to the touch, while high-quality steel will not have such a bad feel. The reason for problems with product feel and appearance is that the manufacturer's rolling process exceeds the standard. This is often caused by the manufacturer's one-sided pursuit of production profits and irresponsibility. In addition, the appearance of inferior pipes is prone to some cracks, usually because the production process is not strictly controlled and there are problems in the process.

3. You can also judge its quality by its gloss when purchasing. Inferior products lack metallic luster and tend to appear reddish. There are two main reasons for this. First, the temperature set in the industrial workshop during rolling is not up to standard. Secondly, the temperature measurement of steel is not accurate and is often done through visual inspection, so the rigidity of the steel is naturally not up to standard.