In the past five years, the development trend of stainless steel welded pipes has been relatively good, and great progress has been made in all aspects of scale and quality production technology, especially in the field of demand. In addition, as the stainless steel welded pipe process becomes more and more mature, stainless steel seamless pipes can be gradually replaced in many applications, such as heat exchanger equipment pipes, medium and low pressure boiler pipes, and the like.
- Stainless steel welded pipe equipment production characteristics: light production equipment, low investment, quick construction, simple welding method, complete product specifications, high dimensional accuracy, small wall thickness deviation, surface smoothness, high yield. In the case of mass production, the welded pipe is 20% lower than the seamless pipe. In recent years, the domestic use of “welding – cold rolling” production of stainless steel pipe technology, the use of cold-rolled coils according to the specifications of the longitudinal shear forming, through a multi-gun argon arc welding machine welded into a tube and then cold rolling (pull), welding The performance index of the seam is basically the same as that of the base metal, and the product quality is obviously improved. Therefore, the advantages of using stainless steel welded pipes instead of stainless steel seamless pipes are becoming more and more obvious.
- Advantages of stainless steel welded pipe equipment production: Firstly, in the production process of stainless steel welded pipe, the pipe body is uniformly extruded, and then subjected to on-line bright solid annealing annealing, the surface becomes very smooth, the surface is smooth and easy to expand, and has antifouling function. . This is good for heat dissipation, does not require frequent cleaning, saves time and effort, and saves money. Secondly, the welded pipe is a deep-processed product of the plate, and the advantage of uniform wall thickness is unparalleled, and it can be arbitrarily fixed with high precision. Also, stainless steel is corrosion resistant and has a long service life.
3, stainless steel welded pipe product status: China’s industrial stainless steel welded pipe production capacity does not meet the domestic market demand, the existing stainless steel welded pipe equipment unit most of the process equipment does not match, such as lack of heat treatment and – line testing equipment, so that the unit’s production capacity can not be fully exerted, Generally, only general decorative pipes can be produced, and the low-grade standard stainless steel decorative welded pipes on the market are oversupplied; the higher standard industrial welded pipes, such as chemical mechanical pipe heat exchanger pipes, can only be produced by a few manufacturers, and the production capacity is seriously insufficient.
Can the welded pipe act on the heat exchange equipment?
NO.1, higher standard product tubes are possible. Heat exchanger tubes are indispensable components in tube-tube heat exchange equipment. Heat exchanger tubes are usually selected based on pressure and fluid medium. A misunderstanding of the choice of heat exchanger tubes on the market today is that stainless steel welded pipes cannot be used as heat exchanger tubes, but GB/151-1999 clearly stipulates that when the pipe pressure is ≤ 6.4 MPa, stainless steel welded pipes can be used. In particular, the stainless steel welded pipe production process is now very mature, and it can fully meet the needs of general heat exchanger tubes and exhibit its unique advantages.
NO.2, mature production process, austenitic stainless steel welded pipe will become the first choice
Since the heat exchanger tubes constitute the heat transfer surface of the heat exchanger, the size of the heat exchanger tubes has a large effect on heat transfer. When a small-diameter tube is used, the heat exchange area per unit volume of the heat exchanger is large, the equipment is relatively compact, the metal consumption per unit heat transfer area is small, and the heat transfer coefficient is also high. Although it is troublesome to manufacture, the use of austenitic stainless steel welded pipe as a heat exchange tube can avoid the above problems because the austenitic stainless steel welded pipe has both good corrosion resistance and a smooth surface, and the production process is mature, so the austenitic stainless steel welded pipe It is the first choice for heat exchanger tubes.