Forming technology of seamless pipe fittings

　　What are the main types of seamless pipe fittings forming technology:

　　1. Hot extrusion method

　　Before the extrusion, it is necessary to carry out machining pretreatment of the blank. When the seamless pipe fittings with a diameter of 100 mm or less are extruded, the equipment investment is small, the material waste is small, and the technology is relatively mature. However, once the pipe diameter is increased, hot extrusion requires large tonnage and high power equipment, and the corresponding control system is also upgraded.

　　2, Hot piercing rolling method

　　Hot piercing and rolling is mainly based on longitudinal rolling and cross rolling. Vertical rolling and rolling is mainly limited to dynamic mandrel rolling mill rolling, small frame limiting mandrel rolling mill rolling, three-roller limiting mandrel rolling mill rolling and floating mandrel rolling mill rolling. These methods have high production efficiency, low metal consumption, good product quality, advanced control systems, and increasingly widespread applications. The cross-rolling and rolling method is also widely used in the production of small-sized seamless pipes with low input, short process, suitable for small batches, multiple varieties, multiple specifications and high precision.

　　3, Hot push expansion method

　　The push-expanding and expanding equipment is simple, the cost is low, the maintenance is convenient, the economy is durable, and the product specifications are changed flexibly. If it is necessary to prepare a large-diameter elbow and the like, only some accessories need to be added. It is suitable for the production of medium and thin wall thick large diameter seamless steel pipe, and can also produce thick wall pipe which does not exceed the equipment capacity.

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