Seamless Pipe Specifications.

 Stainless steel seamless pipe has excellent quality and is widely used all over the world. Its corrosion-resistant and strong characteristics are loved by majority. It is widely used in many industries.

 Stainless steel seamless tube has a complex production process, which means that its production cost and price is relatively high, but its smooth surface treatment and excellent corrosion resistance and heat resistance, in some large engineering and precision together play an irreplaceable role

1.   What is stainless steel seamless pipe?

stainless steel seamless pipe is a kind of hollow profile long steel without joint around. For thickness, thick wall thick products, economical, the thinner the wall thickness, the higher the processing cost, and has good heat resistance and corrosion resistance. The corrosion resistance of stainless steel seamless tube depends on alloying elements contained in steel. Chromium is the basic element that makes stainless steel resistant to corrosion. When the chromium content in steel reaches about 12%, chromium reacts with oxygen in corrosive media, forming a very thin oxide film (self-passivation film) on the steel surface, which can prevent further corrosion of the steel matrix. Stainless steel seamless tube in addition to chromium, commonly used alloy elements and nickel, molybdenum, titanium, niobium, copper, nitrogen, etc., to meet the various uses of stainless steel structure and performance requirements.

2.   What is the production process of 304 stainless steel seamless pipe?

 1. Hot Rolling (extruded seamless steel tube) : round tube billet → heating → perforation → three-roll cross rolling, continuous rolling or extrusion → tube stripping → sizing (or reducing) → cooling → straightening → water pressure test (or defect detection) → marking → storage

The raw material of seamless tube rolling is round tube billet, round tube embryo is cut by cutting machine and processed billet with growth degree of about 1 meter, and sent to furnace for heating by conveyor belt. The billet is fed into a furnace to be heated at about 1200 degrees Celsius. The fuel is hydrogen or acetylene. The temperature control in furnace is the key problem. After the round tube billet comes out of the oven, it must go through the pressure punch. The most common puncher is the cone roll puncher, which has high production efficiency, good product quality, large diameter expansion and can wear a variety of steel. After perforation, the round tube is successively rolled by three rolls, cross - rolled, or extruded. After extrusion, take off the pipe and size. The sizing machine rotates into the steel embryo through the conical drill bit at high speed to drill and form the steel tube. The inner diameter of steel pipe is determined by the outer diameter length of drill bit of sizing machine. After sizing, the steel pipe enters the cooling tower and is cooled by spraying water. After cooling, the steel pipe is straightened. After straightening, the steel tube is sent by conveyor belt to metal flaw detector (or water pressure test) for internal flaw detection. If there are cracks, bubbles and other problems inside the steel pipe, it will be detected. Steel pipe quality inspection through strict manual selection. After quality inspection, paint on the pipe number, specification, production batch number and so on. And by the crane into the warehouse.

2. Cold Drawing (rolling) Seamless Steel Tube: round tube billet → heating → perforation → heading → annealing → pickling → oiling (copper plating) → multi-pass cold drawing (cold rolling) → blank tube → heat treatment → straightening → water pressure test (flaw detection) → marking → storage.

The rolling method of cold-drawn (rolled) seamless steel tube is more complicated than that of hot-rolled (extruded) seamless steel tube. The first three steps of their production process are basically the same. The difference starts from the fourth step, after the round tube blank is hit empty, it should be hit and annealed. After annealing, special acidic liquid is used for pickling. After pickling, oil is applied. This is followed by a number of cold-drawn (cold-rolled) rebillet tubes, specialized heat treatment. After heat treatment, it is treated with steel pipe cooling process.

3.   Stainless steel seamless pipe application

Stainless steel seamless tube because of its excellent appearance and metal strength and durability, widely used in petroleum, chemical, medical, food, mechanical instruments and mechanical parts, because of its unique nature is also more and more people's recognition, its application field is still expanding

4.Stainless Steel Seamless Pipe Specifications

5.About The Stainless Steel Seamless Pipe Manufactuers

 HDT Company is professional Stainless Steel Seamless Pipe from ShanDong China.We have sufficient inventory, the company has prepared all kinds of stainless steel coils all the year round, with perfect service system, on time delivery, to ensure the construction period of customers. We have mature industry experience, can according to the different needs of customers, customized size.

Our company has been adhering to the principle of quality first and service-oriented for many years.We have provided high-quality steel for key national projects such as steel structure engineering,highway and railway construction,hydropower stations,mines and factory buildings.

Our company's products are exported to Canada, Spain,ltaly,Mexico,Vietnam,Myanmar,Belgium,India, Australia,Korea,South Africa,Egypt and other countries. Products annual sales volume is 4 million tons.

We sincerely welcome domestic and foreign merchants to visit us. We look forward to developing commonly and create brilliance together!