The main differences between seamless pipes and welded pipes lie in their manufacturing process, appearance, wall thickness, performance, price, and application areas.
1. Manufacturing process:
Seamless pipes are made by piercing steel billets or solid billets, and processing them through hot rolling or cold rolling. Seamless pipes are formed in one go during the rolling process without welded joints.
Welded pipes are made by bending steel plates or strips and welding them together, usually using two methods: cold rolling and high-frequency welding.
2. Appearance:
The seamless pipe surface has no seams and is overall smooth and uniform.
The inner wall of the welded pipe has welding ribs, and the surface has one or more long welds.
3. Wall thickness:
The precision of seamless pipes is low, and the wall thickness is relatively thick due to the low brightness of their inner and outer surfaces, resulting in high sizing costs.
The precision of welded pipes is high, and the wall thickness is usually thin because of its small wall thickness tolerance, and the wall thickness of the entire circumference is very uniform.
4. Performance:
Seamless pipes have better performance in corrosion resistance, pressure resistance, and high temperature resistance than welded pipes, and are suitable for high temperature, high pressure, and corrosive environments.
The performance of welded pipes depends on the welding quality, and welded joints may become potential sources of corrosion and weakness, but these issues can be reduced through appropriate welding techniques and corrosion protection.
5. Price:
The production process of seamless pipes is more complex and the cost is higher, so the price is also more expensive than welded pipes.
6. Application areas:
Seamless pipes are commonly used for conveying fluid pipelines that require resistance to high pressure, high temperature, and other special environments, such as oil and gas transportation, chemical engineering, and high-pressure boilers.
Welded pipes are suitable for general engineering and low-pressure applications such as building structures, hydraulic transportation, and general pipeline systems.
In summary, the differences between seamless pipes and welded pipes are mainly reflected in manufacturing processes, appearance, wall thickness, performance, price, and application areas. Seamless pipes have superior performance in corrosion resistance, pressure resistance, and high temperature resistance due to their characteristic of having no welded joints, making them suitable for applications in special environments; Welded pipes, on the other hand, are suitable for general engineering and low-pressure applications due to their lower production costs and higher flexibility.
Fengmai Company sells stainless steel welded pipe industrial pressure pipelines with full specifications, including national and non-standard stainless steel welded pipe specifications, customized pipe diameters of 6-3500mm, and a stock of over 6000 tons. The production is fast, the delivery time is accurate, and materials can be processed. Fengmai Company has been focusing on the stainless steel pipe industry for 15 years. Your professional consultant for stainless steel seamless pipes is looking forward to cooperation!
