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The specifications of best-selling seamless steel pipes vary by industry, application and region, but some common specifications are popular due to their wide applicability. According to market research and industry data in 2025, the following are the best-selling seamless steel pipe specifications and related information carefully summarized by Permanent Steel Manufacturing Co., Ltd:
- 20# seamless steel pipe
Material: 20# is a high-quality carbon structural steel with good comprehensive properties and is easy to process and weld.
Application: Widely used in the manufacture of mechanical parts, hydraulic cylinders, cylinders, bearings, etc., and is also commonly used to transport fluids.
Features: 20# steel pipe has high cost performance and strong applicability, so it is in great demand.
- 45# seamless steel pipe
Material: 45# is a medium carbon steel with high strength and hardness and good cutting performance.
Application: Commonly used in manufacturing various mechanical parts, such as gears, shafts, connecting rods, etc.
Features: 45# steel pipe has excellent mechanical properties and is widely used.
- 16Mn seamless steel pipe
Material: 16Mn is a low alloy structural steel with high strength and toughness.
Application: Commonly used in the manufacture of high pressure vessels, pipelines, bridges, etc.
Features: 16Mn steel pipe has excellent performance and is suitable for harsh working conditions.
- Small and medium diameter seamless steel pipes
Specifications: Outer diameter is between 50mm and 150mm, wall thickness is between 4mm and 10mm.
Application: Widely used in fluid transportation, mechanical structure, precision instruments, construction, chemical industry, automobile and other fields.
Features: Small-diameter seamless steel pipes have high dimensional accuracy and good surface finish.
- Large diameter seamless steel pipe
Specifications: The outer diameter is relatively large, usually above 100mm, mostly between 219mm and 720mm, and the wall thickness is between 10mm and 30mm.
Application: Commonly used in oil and natural gas pipelines, marine engineering, water conservancy projects, large structural parts, etc.
Features: Large-diameter seamless steel pipes have strong pressure bearing capacity and are suitable for heavy-load conditions. With the advancement of infrastructure construction, the demand for large-diameter seamless steel pipes is also growing steadily.
Conclusion
Small, medium and large diameter seamless steel pipes have become the best-selling specifications at present due to their wide applicability and market demand. At the same time, brand influence, technological innovation and expansion of application scenarios are also important factors driving the development of the seamless steel pipe market.
In addition to the above common specifications, there are also some special specifications of seamless steel pipes that may be popular due to their special uses, such as:
API 5L pipeline steel pipe: used for oil and natural gas pipelines.
GB/T 8162 seamless steel pipe for structure: used for general structure and mechanical structure.
GB/T 8163 seamless steel pipe for fluid transportation: used for conveying water, oil, gas and other fluids.
It should be noted that the specifications of best-selling seamless steel pipes will be affected by factors such as market supply and demand, industry development trends, etc. The specific situation needs to be determined based on actual demand and market research.
Read more: Sandblasting of Seamless Tubes: Definition, Purpose and Process
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