Medium-pressure seamless steel pipes typically refer to seamless steel pipes used in medium working pressure ranges (approximately 1.6–10 MPa, depending on specific standards and operating conditions). Moreover, medium-pressure seamless steel pipes balance strength, toughness, and economy, achieving a core industrial pipe material that balances safety, performance, and cost, making them suitable for most conventional industrial pressure systems.

1. What are the advantages of medium-pressure seamless steel pipes?
- Seamlessness: Compared to welded steel pipes, seamless steel pipes are superior in load-bearing capacity and pressure resistance because there are no weld seams on either the inner or outer surfaces, avoiding weaknesses that may arise from welding defects.
- High strength: Due to the manufacturing process of seamless steel pipes, their grains are more compact, resulting in higher strength and hardness, enabling them to withstand greater pressure and impact.
- Corrosion resistance: By using different alloying elements or surface treatments, medium-pressure seamless steel pipes can possess excellent corrosion resistance, maintaining stable operating conditions even in harsh environments.
- Versatility: Medium-pressure seamless steel pipes can be made of different materials, such as carbon steel and alloy steel, to meet the requirements of various application scenarios, depending on different engineering needs.

2. Applications of Medium-Pressure Seamless Steel Pipes
- Oil and Gas Industry: Medium-pressure seamless steel pipes are widely used in oil fields, natural gas pipelines, and other fields, undertaking the important tasks of transportation and pressure bearing.
- Chemical Industry: Medium-pressure seamless steel pipes are also a common material in chemical equipment and pipeline systems, favored for their excellent corrosion resistance.
- Machinery Manufacturing: In the field of machinery manufacturing, medium-pressure seamless steel pipes are widely used to manufacture high-pressure cylinders, drive shafts, and other components, ensuring the safe and reliable operation of equipment.

3. Manufacturing Processes of Medium-Pressure Seamless Steel Pipes
- Piercing: Selecting appropriate billets, the billets are processed into tube blanks in a cold state using a piercing mill.
- Rolling: The tube blanks are processed into seamless steel pipes through hot rolling, cold rolling, and other processes using rolling machinery, ensuring the uniformity of the pipe wall and dimensional accuracy.
- Heat treatment: Through heat treatment processes such as quenching and annealing, the microstructure of the steel pipe is adjusted to improve its strength and hardness.