Large-diameter steel pipe forming method

1. Hot push system expansion method

Pushing and expanding equipment is simple, low-cost, easy to maintain, economical and durable, flexible product specifications change, if you need to prepare large-caliber steel pipes and similar products, only need to add some accessories. It is suitable for the production of medium and thin-wall thick large-diameter steel pipes, as well as thick-walled pipes that do not exceed the capacity of the equipment.

2. Hot extrusion method

Before extrusion, the blanks need to be machined and pre-processed. When extruding pipes with a diameter of less than 100mm, the equipment investment is small, the material waste is small, and the technology is relatively mature. However, once the diameter of the pipe is increased, the hot extrusion method requires large-tonnage and high-power equipment, and the corresponding control system must also be upgraded.

3. Hot piercing and rolling method

Hot piercing rolling is mainly based on longitudinal rolling and cross rolling. Longitudinal rolling extension rolling mainly includes rolling with limited mandrel continuous rolling tube, rolling with limited stand mandrel continuous rolling tube, rolling with three-roll limited mandrel continuous rolling tube and rolling with floating mandrel continuous rolling tube. These methods have high production efficiency, low metal consumption and good products, and the control system is increasingly used.