Factory direct sales of galvanized carbon steel square tubes
Square tubes are a name for square tubes and rectangular tubes, that is, steel tubes with equal and unequal side lengths. They are made by rolling strip steel after processing. Generally, the strip steel is unpacked, flattened, curled, and welded to form a round tube, which is then rolled into a square tube and cut into the required length.

Product Introduction
Also known as square and rectangular cold-bent hollow steel, referred to as square tubes and rectangular tubes, with codes F and J respectively
1. The allowable deviation of the wall thickness of the square tube shall not exceed plus or minus 10% of the nominal wall thickness when the wall thickness is not more than 10mm, and plus or minus 8% of the wall thickness when the wall thickness is greater than 10mm, excluding the wall thickness of the corners and weld areas.
2. The usual delivery length of the square tube is 4000mm-12000mm, with 6000mm and 12000mm being the most common. Square tubes are allowed to be delivered in short lengths and non-fixed lengths of not less than 2000mm. They can also be delivered in the form of interface tubes, but the interface tubes should be cut off when used by the purchaser. The weight of short length and non-fixed length products shall not exceed 5% of the total delivery volume. For square tubes with a theoretical weight greater than 20kg/m, it shall not exceed 10% of the total delivery volume.
3. The curvature of the square tube shall not exceed 2mm per meter, and the total curvature shall not exceed 0.2% of the total length