The main difference between a color-coated aluminum coil and a color-coated coil lies in the substrate and application field. ‌

Color-coated aluminum coil is based on aluminum, and the surface of the aluminum substrate is colored by a paint-coating process. Common ones are fluorocarbon color-coated aluminum coil and polyester color-coated aluminum coil. This material has become an ideal choice for modern building exterior walls and interior decoration due to its high strength and non-deformation characteristics. At the same time, it provides a variety of color and pattern customization services, making the building appearance more personalized and maintaining the durability and low maintenance cost of the material. ‌
The substrate of the color-coated coil is generally a cold-rolled plate, and the surface of the steel plate is coated by a coating process. Common coatings include epoxy resin, polyester, etc. The color-coated coil is widely used in construction, home appliances, and other fields due to its good corrosion resistance, fire resistance, and low maintenance cost. ‌

Color-coated aluminum coils and color-coated steel coils also have different performances. For example, color-coated aluminum coil can form an aluminum oxide film in the atmosphere to prevent further corrosion, while color-coated steel coil is prone to corrosion and rust under the erosion of humid air and rain and snow, especially at the joints.

1. Manufacturing process
Seamless square tubes are made through a series of seamless processes such as perforation and tube rolling, and there is no weld as a whole. Ordinary square tubes are made by welding the strip steel after curling and forming, and there are obvious welds.

2. Performance
Seamless square tubes have higher pressure resistance and better sealing, because they do not have the weak link of welds, and can withstand higher pressure and a more complex working environment. In contrast, there may be a certain risk of leakage at the welds of ordinary square tubes, and the pressure resistance is relatively weak.

3. Material
The material of seamless square tubes is usually more uniform and has relatively fewer impurities, so it has better mechanical properties and chemical stability. The material uniformity of ordinary square tubes may be affected by the welding process.

4. Application field
Seamless square tubes are often used in occasions with high requirements for sealing and pressure resistance, such as petrochemical, aerospace, high-pressure boilers, and other fields. Ordinary square tubes are more used in general engineering fields such as building structures, machinery manufacturing, and furniture manufacturing.

1. Material problems
Seamless steel pipes are made by perforating steel billets, so the quality of the material has a crucial impact on the quality of the steel pipe. If there are quality problems with the steel billet, such as uneven composition and high impurity content, cracking will occur during the perforation process. In addition, brittle inclusions and carbide segregation contained in the material will also affect the toughness of the seamless steel pipe and make it easy to crack.

2. Heat treatment
The heating temperature and time cannot guarantee whether the heat treatment of the steel pipe is in place, which will also affect the toughness of the steel pipe and make it easy to crack.

3. Straightening force
During the straightening process, excessive straightening force will also cause internal injuries and cracks in the steel pipe. In the later stage, there is no flaw detection and it is directly packaged and shipped. This is also the reason for the cracking of the steel pipe in the later stage.

4. Tensile deformation
If the drawing deformation is too large, cracks will also form on the steel pipe, causing cracks in the steel pipe during post-processing.