Stainless steel seamless tube
发布时间：2019/4/18
The stainless steel seamless pipe is a long strip of steel with a hollow section and no seams around it. The thicker the wall thickness of the product, the more economical and practical it is, and the thinner the wall thickness, the greater the processing cost.
The process of the product determines its limited performance. Generally, the seamless steel pipe has low precision: uneven wall thickness, low brightness inside and outside the pipe, high fixed-length cost, and pitting and black spots on the inside and outside, and its detection; Shaping must be processed offline. Therefore, it embodies its superiority in high-pressure, high-strength, mechanical structural materials.
Hot rolling, hot extrusion, and cold drawing (rolling) of stainless steel tubes by rolling method.
According to stainless steel metallographic structure, semi-ferrite semi-Martens stainless steel seamless pipe, martens tic stainless steel seamless pipe, austenitic stainless steel seamless pipe, austenitic-ferrite iron stainless steel seamless pipe, etc. .
Stainless steel seamless pipe manufacturing process
1. Hot rolling (extrusion seamless steel pipe): round billet heating perforation three-roll cross-rolling, continuous rolling or extrusion pipe removal sizing (or reducing diameter) cooling straightening hydraulic test (or flaw detection) mark warehousing
The raw material for rolling the seamless pipe is a round tube blank, and the round tube embryo is cut into a blank having a length of about 1 m by a cutting machine, and sent to a furnace for heating via a conveyor belt. The billet is fed into a furnace and heated to a temperature of approximately 1200 degrees Celsius. The fuel is hydrogen or acetylene. Furnace temperature control is a key issue. After the round billet is released, it is subjected to a through-hole punching machine. The more common perforating machine is a conical roller punching machine. This perforating machine has high production efficiency, good product quality, large diameter of perforation and can wear a variety of steel types. After perforation, the round billet is successively rolled, rolled or extruded by three rolls. After extrusion, the tube should be sizing. The sizing machine is rotated at a high speed by a conical drill bit into a steel core to form a steel pipe. The inner diameter of the steel pipe is determined by the outer diameter of the sizing machine drill bit. After the steel pipe has been sized, it enters the cooling tower and is cooled by water spray. After the steel pipe is cooled, it is straightened. After the steel pipe is straightened, it is sent to a metal flaw detector (or water pressure test) by a conveyor belt for internal flaw detection. If there are cracks inside the steel pipe, bubbles and other problems will be detected. After the quality inspection of the steel pipe, it must be carefully selected by hand. After the quality inspection of the steel pipe, the paint is sprayed with the number, specification, production batch number, etc. It is hoisted into the warehouse by a crane.
2. Cold drawn (rolled) seamless steel pipe: round tube blank heating perforation head annealing pickling oiling (copper plating) multi-pass cold drawing (cold rolling) blank tube heat treatment straightening Hydraulic pressure test (inspection) mark storage.
The rolling method of cold drawn (rolled) seamless steel pipe is more complicated than hot rolling (extrusion seamless steel pipe). The first three steps of their production process are basically the same. The difference begins with the fourth step. After the round billet is hollowed out, it is required to start and anneal. After annealing, it is acid washed with a special acidic liquid. After pickling, apply oil. This is followed by a multi-pass cold drawing (cold rolling) of the blank tube, followed by a special heat treatment. After heat treatment, it is straightened.
With the implementation of China's reform and opening up policy, the national economy has experienced rapid growth, and urban residential buildings, public buildings and tourist facilities have been extensively built, which has placed new demands on hot water supply and domestic water supply. In particular, water quality issues are becoming more and more important and the requirements are constantly improving. Due to its corrosiveness, the commonly used pipe of galvanized steel pipe will gradually withdraw from the historical stage under the influence of relevant national policies. Plastic pipes, composite pipes and copper pipes have become common pipes of pipeline systems. However, in many cases, stainless steel pipes are more advantageous, especially thin-walled stainless steel pipes with a wall thickness of only 0.6-1.2 mm in high-quality drinking water systems, hot water systems, and water supply systems that put safety and hygiene first. Safe, reliable, environmentally friendly, and economical. It has been proved by domestic and international engineering practice that it is one of the best, new, energy-saving and environment-friendly pipes for water supply systems. It is also a very competitive water supply pipe, which will definitely improve water quality and improve people's living standards. Comparable role.
In the building water supply system, since the galvanized steel pipe has ended its centuries-old history, various new plastic pipes and composite pipes have been rapidly developed, but various pipes have some disadvantages to varying degrees, far from being able to fully adapt to the water supply pipe. The needs of the department and the state's requirements for drinking water and related water quality. Therefore, the experts predict that the building water supply pipe will eventually return to the era of metal pipes. According to the experience of foreign applications, thin-walled stainless steel pipes are recognized as one of the best comprehensive performance pipes in metal pipes.
About us
Shanghai Yikai Metal Products Co.,Ltd is a influential company in local area, in which specialize in manufacturing stainless steel products, pure titanium, titanium alloy ,plating titanium stainless steel products, nickel and nickel alloy products, to always insist to in the principles with customer's satisfaction first level , it can be fabricated typicals such as sheet/plate, bar/rod, pipe/tube seamless /welded round /square with all metal materials if you can draw it or send or fax to us, it could be realized by our efforts. We have perfect service system that staff 24h on call , fast delivery. If you have needs on products , please let me know .
