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Seamless Steel Pipes

• Production process: Manufactured by piercing a solid billet of steel and then stretching and shaping it into a tubular form without any seams.
• Characteristics: High strength, good pressure - resistance, and excellent dimensional accuracy. They have a smooth inner and outer surface, which reduces fluid resistance.
• Applications: Widely used in high - pressure fluid transportation, such as in oil and gas pipelines, where they can withstand the high - pressure transportation of crude oil, natural gas, and refined petroleum products. They are also used in power plant boiler tubes, as they can endure high - temperature and high - pressure steam. In addition, seamless steel pipes are suitable for mechanical processing, such as manufacturing shafts and axles due to their high strength and accuracy.

Welded Steel Pipes

• Production process: Made by welding a strip of steel into a tubular shape. The welding methods include electric resistance welding (ERW) and submerged arc welding (SAW).
• Characteristics: Can be produced in large diameters and various wall thicknesses. They are relatively more cost - effective than seamless pipes for certain applications.
• Applications: Commonly used in water supply and drainage systems, as they can meet the requirements of transporting water and sewage in urban and industrial settings. In the construction industry, they are used for building frameworks and scaffolding due to their good mechanical properties and lower cost. Welded steel pipes are also used in some low - pressure gas pipelines and in the manufacturing of some simple mechanical structures.

Stainless Steel Pipes

• Production process: Manufactured using stainless steel alloys, which may involve processes similar to seamless or welded pipe production, depending on the specific type.
• Characteristics: Excellent corrosion resistance, high temperature resistance, and good aesthetic appearance. They have good mechanical properties and can maintain their strength and stability in harsh environments.
• Applications: In the food and beverage industry, they are used for transporting food - grade fluids and for equipment such as processing pipelines and storage tanks, as they ensure hygiene and prevent contamination. In the pharmaceutical industry, stainless steel pipes are used in drug production lines to meet high - cleanliness requirements. They are also widely used in architectural decoration, such as for handrails, decorative columns, and facades, due to their good appearance and durability.

Alloy Steel Pipes

• Production process: Produced by adding various alloying elements (such as chromium, molybdenum, vanadium, etc.) to carbon steel to improve its properties. The manufacturing process is similar to that of seamless or welded steel pipes.
• Characteristics: Have high strength, good wear resistance, and excellent heat resistance. They can maintain their mechanical properties at high temperatures and in corrosive environments.
• Applications: In the petrochemical industry, they are used in reactors, heat exchangers, and pipelines that handle high - temperature and high - pressure corrosive media. In the power generation industry, alloy steel pipes are used in super - critical and ultra - super - critical power plants for boiler tubes and steam pipelines, as they can withstand extremely high temperatures and pressures. They are also used in some high - performance mechanical equipment and aerospace applications that require materials with excellent comprehensive properties.

Galvanized Steel Pipes

• Production process: Coated with a layer of zinc on the surface of the steel pipe through hot - dip galvanizing or electro - galvanizing.
• Characteristics: The zinc coating provides good corrosion protection, extending the service life of the steel pipe. It has good anti - rust and anti - corrosion properties in humid environments.
• Applications: Commonly used in water supply pipelines, especially in outdoor and underground water supply systems, as the galvanized layer can prevent the pipe from rusting and ensure the quality of the water. They are also used in some outdoor architectural structures and equipment that require corrosion protection, such as in agricultural greenhouses, where the pipes are exposed to the outdoors and need to resist the erosion of the natural environment.