Large-diameter steel pipe forming methods

There are three methods of large diameter steel pipe forming. These methods are widely used in industrial steel pipe manufacturing. Different methods will have different applications.

1. Thermal expansion method. The diameter expansion equipment is simple, low-cost, easy to maintain, economical and durable, and flexible in product specifications. If you need to prepare large-diameter steel pipes and other similar products, you only need to add some accessories. It is suitable for the production of medium and thin-walled large-diameter steel pipes, as well as thick-walled pipes that do not exceed the capacity of the equipment.

2. Hot extrusion method. The billet needs to be pre-processed by machining before extrusion. 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 pipe diameter size increases, the hot extrusion method requires large tonnage and high-power equipment, and the corresponding control system must be upgraded.

3. Hot piercing and rolling method. Hot piercing rolling is mainly based on longitudinal rolling and cross rolling. Longitudinal rolling and extension rolling are mainly limited-moving mandrel continuous tube rolling, small-stand limited-moving mandrel continuous tube rolling, three-roll limited-moving mandrel continuous tube rolling, and floating mandrel continuous tube rolling. These methods have high production efficiency, low metal consumption, good products, and control systems, which are increasingly widely used. Large-diameter steel pipes are annealed and heat-treated before they leave the factory. This delivery state is called annealed state. The purpose of annealing is mainly to eliminate the structural defects and internal stress left over from the previous process and to prepare the structure and performance for the subsequent process. Alloy structural steel, structural steel with guaranteed hardenability, cold heading steel, bearing steel, Tool steel, steam turbine blade steel, iron cable-type stainless steel, and heat-resistant steel are usually delivered in the annealed state.

According to know these methods of the large diameter steel pipe forming, I think you find which ways suit for your project.