Brief introduction of stainless steel decorative pipe
Stainless steel decorative pipe, also referred to as stainless steel welded pipe, is a steel pipe made of common steel or steel strip after crimping, unit and die forming. Welded steel pipe has simple production process, high production efficiency, many varieties and specifications and few equipment, but its strength is generally lower than that of seamless steel pipe.
Since 1930s, with the rapid development of high-quality strip continuous rolling production and the progress of welding and inspection technology, the weld quality has been continuously improved, and the varieties and specifications of welded steel pipes have been continuously increased. Seamless steel pipes have been replaced in more and more fields, especially in heat exchange equipment pipelines, decorative pipelines, medium and low pressure fluid pipelines and so on.
Classification of stainless steel decorative pipes
There are many kinds of stainless steel pipes, but the main uses are as follows:
A, the classification of stainless steel pipe
1, classified by production mode:
(1) Seamless tubes, cold-drawn tubes, extruded tubes and cold-rolled tubes.
(2) Welded pipe:
(a) Gas shielded welded pipes, arc welded pipes and resistance welded pipes (high frequency and low frequency) are classified according to the process.
(b) Straight welded pipe and spiral welded pipe are divided according to weld.
2. According to the section shape, it is classified as (1) circular steel pipe; ② Rectangular tube.
3. Classification of thin-walled steel pipes and thick-walled steel pipes according to wall thickness
4. Classification by use: (1) Civil pipelines are divided into round pipes, rectangular pipes and flower pipes, which are generally used for decoration, architecture and structure;
(2) Industrial pipes: steel pipes for industrial water distribution pipes, steel pipes for main water distribution pipes (drinking water pipes), mechanical structure/fluid conveying pipes, boiler heat exchange pipes, food hygiene pipes, etc. It is generally used in various fields of industry, such as petrochemical industry, paper making, nuclear energy, food, beverage, medicine and other industries with high requirements for fluid media.
Second, seamless steel pipe
Stainless steel seamless pipe is a kind of long steel with hollow section and no seam around it.
1. Manufacturing technology and flow of seamless steel pipe:
Smelting > ingot > steel rolling > sawing > peeling > perforation > annealing > pickling > ash removal > cold drawing > cutting head > pickling > warehousing.
2. The characteristics of seamless steel pipe:
It is not difficult to see from the above technological process: firstly, the thicker the wall thickness of the product, the more economical and practical it will be, and the thinner the wall thickness, the higher its processing cost will be; Secondly, the technology of this product determines its limitations. Generally, the precision of seamless steel pipe is low: the wall thickness is uneven, the brightness of the inner and outer surfaces of the pipe is low, the cut-to-length cost is high, and the pits and black spots on the inner and outer surfaces are difficult to remove; Third, its detection and shaping must be done off-line. Therefore, it shows its advantages in high pressure, high strength and mechanical structure materials.
Third, weld steel pipes.
Welded steel pipe, referred to as welded pipe for short, is a stainless steel pipe made of steel plate or steel strip after crimping, unit and die forming.
1. steel plate >; Stripping > forming > fusion welding > induction bright heat treatment >: internal and external weld bead treatment > shaping > shaping > eddy current testing > laser diameter measurement > pickling > warehousing.
2. The characteristics of welded steel pipe:
From the above technological process, we can easily see that: firstly, the product is continuously produced online, and the greater the wall thickness, the greater the investment of the unit and welding equipment, and the less economical and practical it is. The thinner the wall thickness, the lower the input-output ratio. Secondly, the technology of this product determines its advantages and disadvantages. Generally, welded steel pipes have high precision, uniform wall thickness and high brightness inside and outside stainless steel pipe fittings (the surface brightness of steel pipes is determined by the surface grade of steel plates), and can be cut at any length. Therefore, it is economical and beautiful in the application of high-precision, medium and low-pressure fluids.