Precision seamless tube is a kind of seamless tube made by cold rolling, cold drawing or cold drawing + cold rolling joint process of high precision, its manufacturing process is a journey according to a series of different size requirements to start with seamless extrusion, after many times of diameter reduction and wall reduction, until the precise specifications to meet customer requirements.
After each reduction of OD process, the tube is cut, cleaned and heat treated before the next reduction process begins. In the combined process of cold drawing and cold rolling, the wall thickness is controlled by cold rolling, and the outer diameter is controlled by cold drawing, so that the production requirements of a wide range of materials and various specifications of seamless tubes can be met. The combined process has many advantages, such as good quality of finished product, high precision of wall thickness and outer diameter, good surface quality, short processing cycle, reduced heat treatment process, energy saving, high utilization rate of tube billet, simplified specifications and so on.
Because the precision seamless pipe has the advantages of no oxide layer inside and outside the wall, no leakage under high pressure, high precision, high finish, no deformation in cold bending, no cracks in flaring and flattening, so it is widely used, such as instrument sleeve connection, automobile high and low pressure fuel distributor and air conditioning filter, high-speed locomotive, heat exchanger, electronics, aviation, aerospace, navigation, oil and gas, petrochemical, precision machinery and other industries. Especially when it has high requirments on various material performance under harsh application conditions such as high temperature, strong corrosion etc, and when it has strict requirements on tube shape and dimensional accuracy and surface roughness and cleanliness and so on, precision seamless tubes are usually used, which are made of stainless steel, corrosion resistant alloy, high temperature alloy, precision alloy, electric heating alloy, functional metal materials and other special metals. This has put forward strict requirements and challenges for production equipment, process control, quality testing, performance testing and other aspects.
