Stainless steel seamless pipe vs. welded pipe

What is stainless steel welded pipe?

Stainless steel welded pipe is a steel pipe made by welding stainless steel plates or steel strips after being curled and formed by a unit and a mold. The production process of stainless steel welded pipe is simple, the production efficiency is high, there are many varieties and specifications, and the equipment investment is low.

What is stainless steel seamless pipe?

Stainless steel seamless pipe is a long steel material with a hollow section(Stainless Hollow Section) and no seams around it. The thicker the wall thickness of the product, the more economical and practical it is. The thinner the wall thickness, the processing cost will increase significantly.

The process of this product determines its limited performance. Generally, seamless steel pipes have low precision: uneven wall thickness, low brightness of the inner and outer surfaces of the pipe, high cost of sizing, and pitting and black spots on the inner and outer surfaces that are difficult to remove; its detection and shaping must be processed offline.

Untreated stainless steel welded pipes and seamless pipes are easy to distinguish, but seamlessly treated stainless steel welded pipes may be difficult to distinguish with the naked eye. So how do we distinguish stainless steel welded pipes from stainless steel seamless pipes?

1. Differences in production technology

Stainless steel welded pipe: Steel plate or steel strip is welded after being curled and formed by the unit and mold. Welding methods are divided into straight seam welded pipes and spiral welded pipes. The more common one is straight seam welded pipe.

Stainless steel seamless pipe: Use round steel to cut off the outer skin, center it and then hot-roll and perforate it to reach the required size.

2. Appearance

Stainless steel welded pipe: high precision, uniform wall thickness, high brightness inside and outside the pipe (the surface brightness of the steel pipe is determined by the surface grade of the steel plate), can be arbitrarily scaled; it can be made into thin-walled pipes.

Seamless pipe: low precision, uneven wall thickness, low brightness inside and outside the pipe, high cost of cutting to length, pitting and black spots inside and outside the pipe that are difficult to remove. Usually the tube walls are thicker.

3. Performance

The corrosion resistance, pressure resistance and high temperature resistance of seamless pipes are much higher than those of stainless steel welded pipes. With the improvement of the production process of stainless steel welded pipes, the mechanical properties and mechanical properties are gradually approaching those of seamless pipes, and welded pipes can replace seamless pipes in some respects.

4. Price

The production process of stainless steel seamless pipes is more complicated and the price is more expensive than welded pipes.

5. Use

Stainless steel welded pipes are often used as decorative pipes, pillar pipes, and product pipes. The pressure-bearing performance is average, and it is mainly used to transport water, oil, gas, air and general fluids with low pressure, such as hot water or steam.

Stainless steel seamless pipes: used for pipelines transporting fluids in engineering and large-scale equipment. They can also be used for high-temperature and high-pressure fluid transport main pipes and pipelines in power plants and nuclear power plant boilers.

Advantages of stainless steel welded pipe

1.Cost-effective alternative to seamless

2. Specially designed, excellent appropriation

3. High dimensional accuracy

4. Outstanding corrosion resistance

5. Good durability

Advantages of stainless steel seamless pipes

Stainless steel seamless pipe is resistant to rust and other corrosive attacks. It is heat-resistant for high-performance and high-temperature use.

Article source: https://article-realm.com/article/Business/53205-Stainless-steel-seamless-pipe-vs-welded-pipe.html