The seamless steel pipe consists of a single piece of metal and has a surface, which is called a seamless steel pipe without a joint steel pipe. According to the manufacturing method, the hot rolled tube, the cold rolled tube, the cold drawn tube, the extruded tube, the upper tube, and the like are seamlessly divided. According to the contract research organization S-section shape, the seamless steel pipe is divided into two types: circular and irregular, and the shaped pipe has various complicated shapes such as a square, an ellipse, a triangle, a hexagon, a melon , star and finned tubes. seamless steel pipe manufacturer,The maximum diameter is 650 mm and the minimum diameter is 0.3 mm. Depending on the application, there are thick walled tubes and thin walled tubes. Seamless steel pipes are mainly used as petroleum geological drilling pipes, and cracked pipes are used in the petrochemical industry, boiler tubes, bearing tubes, and high-precision structural steel tubes, tractors, and aviation.
Seamless steel tubes are widely used. Universal seamless steel tubes are rolled from ordinary carbon structural steel, low alloy structural steel or steel with the highest yield of alloy structural steel, and are mainly used as pipes or structural components for conveying fluids. .
Depending on the composition of the three different types of supply used: a, according to the chemical composition and mechanical properties of the supply; B, according to the mechanical properties of the supply; C, according to the water pressure test supply. The pipes are supplied by Type A and B, and if they are used, they are subjected to hydraulic pressure tests.
Special seamless pipes include seamless pipes for boilers, chemical power supplies, geological use of seamless steel tubes and oil seamless pipes.
Seamless steel tubes have a hollow cross section and are used in large quantities as pipes for transporting fluids, such as pipes for transporting petroleum, natural gas, gas, water and certain solid materials. Compared to solid steels such as round steel,3 inch square tubing ,steel pipes with the same bending and torsional strength and economical cross section have a lighter weight.
In the manufacture of structural parts and mechanical parts, such as oil drill pipes, automotive drive shafts, bicycle frames and steel pipe scaffolds for construction, the use of steel pipes to improve the material utilization of the manufacture of annular parts is widely used, simplifying the manufacturing process and saving materials. Both steel pipes are widely manufactured and processed.
Seamless steel pipes have no longitudinal welds. The manufacture of seamless steel tubes requires a mechanism to force the holes into the blank.
Rotary piercing and rolling is the most common method of manufacturing seamless steel pipes today. The process begins with an air-conditioned round steel that is pierced and works when heated. The rod is made to flow around the perforation point to form a hollow billet. The interior of the billet extension tube is supported by a mandrel or plug. The sizing of the steel pipe is achieved by the outer diameter of the additional rolling.
Another advantage of the seamless steel tube is that it provides excellent corrosion resistance because it is less likely to have impurities. The use of seamless steel tubes allows you to avoid ductile defects and poor potentials that may be associated with welded areas of the welded pipe. Unlike welded pipes, seamless pipes do not require integrity testing for welding. Therefore, seamless steel tubes are often more suitable for critical applications.