Stainless steel pipes are divided into seamless pipes and welded pipes according to production methods

Stainless steel pipe is an economical steel and an important commodity in the steel industry. It can be widely used in daily decoration and industry, and many people in the market use it to make stair guardrails Protective window. Guardrail Furniture, etc.

There are 201 and 304 common materials. 8% of total steel is widely used in the social economy. Stainless steel is divided into seamless pipes and welded pipes according to production methods, so what is the difference between the two?

The most direct difference between stainless steel seamless pipes and stainless steel welded pipes is their appearance. The length of seamless pipes is basically different, while the length of stainless steel welded pipes is basically determined. The surface of stainless steel welded pipes is basically mirror like, while stainless steel seamless pipes are gray.

2. Process difference: Stainless steel seamless pipe is a hollow section Long steel without joints around. The thicker the thickness of the product, the more economical and practical it is, while the thinner the thickness, the significantly higher the production cost; The product process determines its limited performance, using round tube material as raw material for perforation and cold rolling The production process of cold drawing or hot extrusion does not involve spot welding on the pipeline. Stainless steel seamless pipes generally have low precision and uneven thickness The surface brightness of the tube is low The cost of fixed length is high, and there are pockmarks on the inner surface Black spots are difficult to remove; Its examination and plastic surgery must be processed offline. Therefore, it is under high pressure High intensity Its advantages are reflected in the mechanical structural materials. Welded pipes, abbreviated as welded pipes, are ordinary steel or steel strips rolled from units and molds. The production process of welded steel pipes is simple, with high production efficiency, multiple types and specifications, and low equipment investment, but generally has lower strength than seamless steel pipes. Since the 1930s, with the rapid development of high-quality strip steel rolling production and advances in welding inspection technology, welding quality has continuously improved, and the variety and specifications of welded pipes have continued to increase, especially in the field of heat exchanger equipment pipelines Decorative pipe Replace seamless pipes with medium and low pressure fluid pipes.

3. The difference in performance and price seamless pipes are much higher than welded pipes in terms of corrosion resistance, pressure resistance, and high temperature resistance. With the improvement of welding pipe production technology, the mechanical properties and mechanical properties are gradually approaching seamless pipes. The production process of seamless pipes is more complex and expensive than welded pipes. Based on the characteristics and differences between seamless stainless steel pipes and welded pipes, select and apply them reasonably to achieve economic benefits Beautiful and reliable effect:

(1) Used as a decorative pipe Product management Prop tubes generally require good surface effects

(2) Transporting low-pressure liquids such as water Oil Gas Generally, low-pressure systems such as heating hot water or steam are selected, and "Zhejiang Longxiang brand" stainless steel welded pipes are used;

(3) Industrial engineering and pipelines for transporting fluids in large equipment, as well as power plants Nuclear power plant boilers require high temperature and high pressure resistance High strength liquid conveying pipes should be made of stainless steel seamless pipes;

(4) Stainless steel welded pipes are generally used for 0.8MPa seamless pipes and can withstand the transportation of liquids below 0.8MPa. If the pressure requirements are not high, using welded pipes will be more economical. Wenzhou Longxiang Steel Pipe Manufacturing Company can design products Sample production to mass production, producing high precision Precision stainless steel fittings have zero surface defects. ISO9001 quality management system requires self inspection of job positions A three in one quality inspection network system to prevent non-conforming products from entering customers.