CBIES AUTOMOTIVE|Selection Of Stainless Steel Welded Pipe And Seamless Steel Pipe

Now the production technology of stainless steel welded pipe is relatively perfect, and it has replaced seamless steel pipe in many aspects, such as petroleum, automobile, papermaking, air conditioning and other industries, and its price is about one-fifth cheaper than the seamless pipe. The market demand for stainless steel seamless steel pipes is mainly manifested in basic industries, among which the demand for petroleum, chemical industry, power generation, and auto parts accounts for one-third of the total consumption of stainless steel seamless steel pipes.

CBIES AUTOMOTIVE specializes in the export of auto parts. The use of welded pipes and seamless pipes is more common and common, such as the use of side door impact beams, the use of shock absorbers, seat tubes, instrument measuring pipes, etc. will be used accordingly arrive.

More producers choose stainless steel welded steel pipe in addition to its cheaper price, but also mainly due to its own characteristics and advantages. Let's first look at the manufacturing process of small-diameter stainless steel welded pipes. The sequence is stainless steel plate, slitting, forming, welding, bright solution treatment, internal and external weld bead treatment, eddy current testing, laser diameter measurement, straightening, and storage.

Through the production process, it can be seen that the stainless steel welded pipe belongs to continuous online production. The thicker the wall thickness, the higher the investment in the unit and welding equipment, and the lower it's economy and practicability. The thinner the wall thickness, the lower the input-output ratio will be. In addition, the process of the product also affects its advantages and disadvantages. Generally, the precision of welded pipes is higher, the wall thickness is more uniform, and the inner and outer surfaces of stainless steel pipe fittings have high brightness (steel plate The surface brightness of the steel pipe is determined by the surface grade), and can be arbitrarily scaled. Therefore, it shows its economy and aesthetics in the use of high-precision, medium and low-pressure fluids.

Let’s take a look at the manufacturing process of seamless steel pipes in the order of smelting, steel ingots, rolling, sawing, peeling, perforation, annealing, pickling, ash, cold drawing, head cutting, pickling, and final storage. It can be known that in addition to the advantages of thick-walled, high-pressure, and high-strength mechanical structural materials, ordinary seamless steel pipes have low precision, uneven wall thickness, low brightness inside and outside the pipe, high cost of cutting to length, and numbness on the inside and outside. Spots and black spots are not easy to remove.

The following is a clearer comparison between the two. First look at the coverage. Stainless steel seamless pipes can achieve small diameter and large wall thickness and large diameter and large wall thickness, but they are generally limited by length, but the wall thickness of stainless steel welded pipes can be made It is relatively thin, and can achieve large diameter and small wall thickness and small diameter and small wall thickness. In theory, the length of the stainless steel coil can be as long as the welded pipe can be made. In other words, the thicker it is, the more suitable it is for seamless pipes, and the thinner it is, the more suitable it is for welded pipes.

The second is the uniformity and concentricity of the pipe wall thickness. In this regard, the stainless steel welded pipe is better than the stainless steel seamless pipe. Because the thickness tolerance of the cold-rolled plate is relatively average, the deformation during the forming process is average. In the rolling process of seamless pipes, affected by factors such as equipment precision, there are problems of uneven thickness and concentricity, but the roundness is better than that of welded pipes.

The second is performance. The uniformity, surface quality, expansion performance, bending and pier performance of stainless steel welded pipes are all better. Because the average performance of the cold-rolled sheet is better than that of the pipe, and the welded pipe is generally a solid solution online, the heat treatment is more average, and the performance is more stable. The stainless steel seamless pipe is sampled at different positions on the same pipe, and the performance will be different.

The other is the price, the price of stainless steel welded pipe is cheaper.

Finally, in terms of pressure-bearing capacity, under the same specification conditions, the pressure-bearing capacity of stainless steel seamless steel pipes is slightly higher than that of welded pipes. However, because stainless steel welded pipe is formed by rolling stainless steel plate, the processing is relatively simple, so the delivery time is shorter. Stainless steel seamless pipes start from round steel, and after piercing, they go through multiple passes of cold drawing and cold rolling, and then solution annealing and pickling to produce finished products. The production cycle is longer.

For the comparison of welded pipes and seamless pipes, each has advantages and disadvantages, and different choices are made according to their own needs.