Manufacturing process and application fields of square tubes

Square tube is a square tube shape, usually rolled from strip steel through process treatment. It has equal side lengths and is available in a variety of materials, including steel pipe, aluminum alloy, stainless steel, etc. Square tubes are widely used in various structures, such as structural square tubes, decorative square tubes, architectural square tubes, etc. The most common material is ASTM A500.

The manufacturing process of square tubes usually includes the following steps:

1. Unpacking the strip: Remove the strip from the reel and make it into one piece.
2. Smoothing: Smoothing the surface of the strip through mechanical or chemical methods.
3. Curling: The flattened steel strip is rolled into a round tube of a certain shape.
4. Welding: Weld the round tube into a square tube.
5. Rolling: The square tube is rolled into the required size through high temperature and pressure.
6. Cutting: Cut the square tube to the required length.

Square tubes can have seamless or welded seams as required. Seamless square tubes are made by extruding seamless round tubes, while welded square tubes are made by welding strip steel into square tubes and then processing them.

Performance index analysis of square tubes:
1. Plasticity
Plasticity refers to the ability of a metal material to produce plastic deformation (permanent deformation) without destruction under load.

2. hardness
Hardness is a measure of how hard or soft a metal material is. The most commonly used method for measuring hardness in production is the indentation hardness method, which uses an indenter of a certain geometric shape to press into the surface of the metal material being tested under a certain load, and the hardness value is measured based on the degree of indentation.
Commonly used methods include Brinell hardness (HB), Rockwell hardness (HRA, HRB, HRC) and Vickers hardness (HV).

3. fatigue
The strength, plasticity, and hardness discussed earlier are all indicators of the mechanical properties of metal under static load. In fact, many machine parts are operated under cyclic loading, and fatigue will occur in the parts under such conditions.

4. Impact toughness
The load acting on the machine part at a very high speed is called impact load, and the ability of metal to resist damage under impact load is called impact toughness.

5. strength
Strength refers to the ability of a metal material to resist damage (excessive plastic deformation or fracture) under static load. Since the load acts in the form of tension, compression, bending, shearing, etc., the strength is also divided into tensile strength, compressive strength, flexural strength, shear strength, etc. There is often a certain relationship between various strengths. In use, tensile strength is generally used as the most basic strength indicator.

Application areas of square tubes:

Square tubes have a variety of application scenarios, such as building structures, bridges, vehicles, machinery manufacturing, furniture, etc. It can be customized according to specific needs, such as changing material, size, surface treatment, etc. When choosing square tubes, you need to comprehensively consider the actual application scenarios and requirements to select the most suitable material and specifications.

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