The seamless pipe which consists of pipe made in one piece, without joints or welds, which results in a pipe designed for uses that require quality and a specialized specification, such as the uses of, Conduction of Fluids and Gases in the Petroleum, Chemical, and Petrochemical Industry, as well as in the Construction area. It serves the oil industry from the exploration and production phases to the refining and laying process of oil and gas lines, whether for land or sea applications. There are many alloy steel pipe manufacturers in india.
Seamless stainless steel pipe production process
The technology for industrial production of ASTM A106 gr b seamless pipes is incredibly complex and time-consuming. Each stage requires a huge expenditure of energy and materials.
The main competitive advantage of ASTM A53 grade b pipe seamless pipes is the absence of welds, which are the most vulnerable spot of any welded pipe. Therefore, high-reliability requirements are imposed on the connection procedure.
Description of the method of hot rolled
Corrosion-proof metal must be cleaned of impurities, and the production process itself must be carefully monitored at all stages: The metal billet from alloy steel is heated to a certain temperature in the furnace 1250–1300 ° С.
Heated red-hot, it is fed to a press-piercing mill, where a giant awl “punch” of a special composition penetrates the workpiece through and through, with a spray of lubricant on the punch. (Fig. 1)
After that, the future pipe is rolled by rollers to a given length, with the required indicators of wall thickness, outer and inner diameter.
The finished element cools and undergoes final calibration in a special container.
The final stage is the preparation of segments of the required length and the marking of products ready for sale.
Some brands of seamless steel pipes like ASTM A333 grade 6 undergo a special procedure of additional hardening. The product heats up and then cools quickly. Repeated several times, the procedure rearranges the molecular lattice of steel, giving it new properties.
Types of seamless pipes
Depending on the production technology, the industry offers consumers two types of products: hot-rolled and cold-rolled pipes.
- Hot rolled pipe
You can also come across the term hot-pressed or hot-deformed. Hot rolling technology does not allow making pipes of small diameters. Also, in this case, it is not always possible to obtain a perfectly smooth pipe surface and guarantee dimensional accuracy.
- Cold rolled pipe
Otherwise, cold drawn or cold-formed. They differ from hot-rolled ones, first of all, by their smaller section and thin walls. The surface of the pipes with this method of production is smoother. When p91 pipe suppliers manufacture products with a different cross-sectional type (rectangle, star, oval, hexagon, etc.), only the cold deformation method is used.
- Thick-walled and thin-walled pipes
Another criterion is the wall thickness of the product. This indicator largely determines the scope of the pipe material. Thick-walled and thin-walled steel pipes are divided:
The hot-rolled seamless pipe has a diameter of 28–426 mm, with a wall thickness of 3–40 mm.
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