Stainless steel, which has good comprehensive performance and appearance, is a stainless and acid-resistant metal material. Stainless steel will not cause corrosion, pitting, rust or wear, so it can keep the integrity of the engineering design of the structural components permanently. At the same time, stainless steel is one of the strongest materials in the metal materials used in construction.
Difference between
seamless stainless steel pipe and welded pipe
Stainless steel, which has good comprehensive performance and appearance, is a stainless and acid-resistant metal material. Stainless steel will not cause corrosion, pitting, rust or wear, so it can keep the integrity of the engineering design of the structural components permanently. At the same time, stainless steel is one of the strongest materials in the metal materials used in construction.
Among stainless steel products, stainless steel pipes are also widely used in various industries due to their good ductility. As a hollow long cylindrical steel material, stainless steel pipes are used as pipelines for conveying fluids. They are mainly widely used in industrial pipelines such as petroleum, chemical, medical, food, light industry, mechanical instruments, and mechanical structural components.
Stainless steel pipes are mainly divided into two basic categories: seamless stainless steel pipes and welded stainless steel pipes (referred to as welded pipes). The main difference between the two is whether there is a weld on the inner wall of the pipe.
01 Difference in manufacturing process
NO.1
Seamless stainless steel pipe
Stainless steel seamless steel pipe, as its name suggests, has no welds. It is made of round tube billets as raw materials for perforation, and is made through cold rolling, cold drawing or hot extrusion production processes. There are no welding points on the pipe.
NO.2
Stainless steel welded pipe
Stainless steel welded pipe is made of steel plate or steel strip after curling and forming by the unit and mold. There is generally a weld on the inner wall of the pipe.
Welding process
02 Difference in thickness
NO.1
Seamless stainless steel pipe
The thicker the wall thickness of the stainless steel seamless pipe, the more economical and practical it is. The thinner the wall thickness, the higher its processing cost will be.
NO.2
Stainless steel welded pipe
The raw steel strips of stainless steel welded pipes are all rolled and have a relatively uniform thickness.
Stainless steel seamless pipe·The pipe wall is thick or thin
03The difference between performance and price
NO.1
Stainless steel seamless pipe
Stainless steel seamless pipe is much higher than welded pipe in corrosion resistance, pressure resistance and high temperature resistance; and the seamless pipe is more complicated in manufacturing process, and its price is more expensive than welded pipe.
NO.2
Stainless steel welded pipe
With the improvement of welded pipe manufacturing process, stainless steel welded pipe is gradually approaching seamless pipe in mechanical properties and mechanical properties.
Stainless steel seamless pipe·Annealing scene
04Difference in use
NO.1
Stainless steel seamless pipe
Seamless pipe is mainly industrial pipe, especially in high pressure, high strength, and mechanical structure materials.
NO.2
Stainless steel welded pipe
Stainless steel welded pipe is widely used in the field of decorative welding, and is also used in the fields of medium and low pressure fluid pipes.
So when we purchase steel pipes, we can purchase steel pipes with different performances according to customer characteristics; we can also purchase in a diversified way, increase the types of steel pipes, and serve different customer groups with diverse needs.
In today's society, stainless steel products are generally polished during production. Polishing can improve the glossiness of the stainless steel surface and form a protective film on the stainless steel surface, which can better maintain the "stainless" characteristics of stainless steel.
After polishing and grinding, if there is no passivation film, the corrosion resistance of the steel pipe is poor. Therefore, after the polishing process, when manufacturing the steel pipe, there is also a passivation pickling process, the purpose is to remove the black precipitate remaining on the steel pipe after pickling, that is, the oxides of chromium and nickel, so that the surface of the steel pipe is bright, white and beautiful. The passivated steel pipe must also be cleaned in a hot water tank above 80°C.
