Hot rolling (squeezing seamless steel pipe): round tube blank → heating → perforation → three -rolling rolling rolling, continuous rolling or squeezing → deserture → fixed diameter (or reduction diameter) → cooling → straight → water pressure → water pressure Test (or detecting) → mark → enter the warehouse.
The hot -rolled steel pipe is used as a raw material with a casting plate or a first rolling plate, which is heated after the step -by -step heating furnace. After rolling, after the final rolling, it passes through layer of cooling and rolling machine rolls to become straight hair rolls. The head and tail of the straight hair curls are often tongue -like and fish tails. The thickness and width accuracy are poor. There are often defects such as wave -shaped, folding edges, and tower shapes. Its roll weight is heavier and the inner diameter of the steel roll is 760mm. (The general management industry likes to use.) After the direct lines such as cutting heads, cutting tails, cutting edges, and multi -channel straight lines are treated, and then cut or re -rolls, that is, it becomes: hot rolled rolling Steel plates, flat hot -rolled steel rolls, longitudinal bands and other products. The hot -rolled scroll If it is picked out and removes the oxidation skin and oil is applied, it will become a hot -rolled pickling plate roll.
