Square tube is a type of square tube and rectangular tube, that is, steel tubes with equal and unequal sides. It is a strip of steel that has been processed and rolled. Generally, the strip is unpacked, flattened, crimped, welded to form a round tube, and then rolled into a square tube by a round tube and then cut into a desired length.
1. The allowable deviation of the wall thickness of the rectangular tube shall not exceed 10% of the nominal wall thickness when the wall thickness is not more than 10 mm, and the positive and negative 8% of the wall thickness when the wall thickness is greater than 10 mm, the angle and the weld area Except for wall thickness.
2. The normal delivery length of the rectangular tube is 4000mm-12000mm, which is mostly 6000mm and 12000mm. The square tube allows the delivery of short and non-scheduled products of not less than 2000 mm, and can also be delivered in the form of an interface tube, but the interface tube should be removed during use. The weight of short and non-scheduled products shall not exceed 5% of the total delivery volume, and the square tube with theoretical weight greater than 20kg/m shall not exceed 10% of the total delivery volume.
3. The bending of the rectangular tube shall not exceed 2 mm per meter, and the total bending shall not exceed 0.2% of the total length.
Square tube is widely used in machinery manufacturing, construction, metallurgical industry, agricultural vehicles, agricultural greenhouses, automobile industry, railways, highway guardrails, container skeletons, furniture, decoration and steel structure.
