Do you understand the difference between stainless steel welded pipe and stainless steel seamless pipe?

Stainless steel tube is a kind of economic section steel, is an important product in the iron and steel industry, can be widely used in life decoration and industry, many people on the market used to make staircase handrails, window guards, railings, furniture and so on. Commonly available 201 and 304 two materials. Accounting for about 8% a 16% of the total amount of all steel, it has an extremely wide range of applications in the national economy. Stainless steel is divided into two categories according to the production method of seamless pipe and welded pipe, so what is the difference between the two?

1. The Difference In Appearance

Stainless steel seamless pipe and stainless steel welded pipe the most direct difference is the appearance, seamless pipe length is basically inconsistent, while the length of stainless steel welded pipe is basically fixed. Stainless steel welded pipe surface is basically a mirror, while the stainless steel seamless pipe is grey and white.

2. The Difference Between The Process

Stainless steel seamless pipe is a kind of long steel with a hollow cross section and no seams around it. The thicker the wall thickness of the product, the more economic and practical it is, the thinner the wall thickness, the processing cost of it will rise substantially; the process of the product determines its limitation performance, the use of a round billet as raw material for piercing, through the production process of cold rolling, cold drawing or hot extrusion production process, there is no welded point on the tube. General seamless steel pipe precision is low: wall thickness is not uniform, low brightness of the inner appearance of the pipe, high cost of sizing, and the inner appearance of the pockmarks, black spots are not easy to remove; its detection and shaping must be processed offline. Therefore, it reflects its superiority in high-pressure, high-strength, mechanical structure materials.

Welded steel pipe is referred to as welded pipe, commonly used steel or steel strip through the unit and mould roll forming and welding made of steel pipe. Welded steel pipe production process is simple, high production efficiency, more varieties and specifications, less investment in equipment, but the general strength is lower than the seamless steel pipe. since the 1930s, with the rapid development of high-quality strip steel rolling production and the progress of welding and inspection technology, the quality of welded seams continue to improve, welded steel pipe varieties and specifications are increasing and in more and more areas, especially in the heat exchange who spare tube, decorative tube, low pressure fluid pipe, etc. instead of seamless steel pipe. Fluid pipe and so on instead of seamless steel pipe.

3. Performance & Price Differences

Seamless pipe in corrosion resistance and pressure and high temperature performance than welded pipe is much higher. With the improvement of the production process of welded pipe, mechanical properties and mechanical properties are slowly approaching the seamless pipe. Seamless pipe in the production process is more complex, its price is more expensive than welded pipe.

Based on the characteristics and differences between seamless stainless steel pipe and welded pipe, it is necessary to choose reasonably when applying to achieve economic, beautiful and reliable results:

(1) used as decorative pipe, product pipe, props pipe, generally require a good surface effect, usually choose stainless steel welded pipe;

(2) For general low pressure fluid transport, such as water, oil, gas, air and heating hot water or steam and other low-pressure systems, usually choose stainless steel welded pipe;

(3) for the use of industrial engineering and large-scale equipment for the transmission of fluid piping, as well as power stations, nuclear power plants, boilers require high temperature and high pressure, high strength of the transmission of fluid piping, stainless steel seamless piping should be used;

(4) Stainless steel welded pipe is generally used for fluid transport below 0.8MPa, seamless pipe can be used to withstand more than 0.8MPa fluid transport. If the pressure requirements are not high, the use of welded pipe will be more economical.

Public Praise Stainless Steel Co.,Ltd is a professional manufacturer of stainless steel pipes & fittings, supplier of stainless steel sheets and coils. The company is located in Wuxi, China, one of the largest gatherings of stainless steel in China, and sells stainless steel products of high quality and good price. Contact Us now to co-operate with us!