Black steel pipes are divided into hot rolled pipes and black annealed pipes.Firstly let me introduce hot rolled steel pipe. Please watch the video, it show us the whole processure of hot rolled steel pipe processure.
well, from the video and our processing chart. we will know the whole production processure include these steps: First uncoiling, end butt welding, forming, welding, removing burrs after welding, cooling, sizing and straightening, cutting, end processing, and then check the damage. Next, Drifing and anti-corrosion, finally is packaging.
From the introduction, I’m sure our have get an general idea of this kind pipe, then tell more details of black annealed steel pipe. The production process of black steel pipe and hot rolled pipe is similar, the difference is that the hot rolled pipes needs sizing and straightening. The black steel pipe don’t need it.
