Square tube, as the name implies, it is a kind of square shape of the tube, a variety of materials can form substances square tube, which media to, what to use, what to use in place, most of the pipe to pipe for the majority, mostly for construction square tube, decorative square tube, square tube construction, etc. square tube, square tube is a call, that is, the side looks such as steel. After treatment process is rolled strip made​​. Generally the strip after unpacking, smooth, curl, welded to form a tube, and then rolled into the square tube by tube and then cut into the desired length. Typically 50 per pack. There seamless square tube and weld points, seamless square tube is seamless tube extrusion.