Stainless steel seamless pipe and sewn pipe is just a seam difference?

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Time of issue:2023-07-21 11:20
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(Summary description)

Stainless steel seamless pipe and sewn pipe is just a seam difference?

(Summary description)

Categories:Industry News
Author:
Origin:
Time of issue:2023-07-21 11:20
Views:

Information

Stainless steel seamless pipe and sewn pipe is just a seam difference?

First of all, concentricity is different. The manufacturing process of seamless pipe is the hole formed by stamping stainless steel square billet below 2200 degrees. Under this high temperature effect, the tool steel will become soft and then spiral out of the hole. The wall thickness of this kind of pipe is simple and uneven, and the degree of partial pain is relatively high. First of all, concentricity is different. The manufacturing process of seamless pipe is the hole formed by stamping stainless steel square billet below 2200 degrees. Under this high temperature effect, the tool steel will become soft and then spiral out of the hole. The wall thickness of this kind of pipe is simple and uneven, and the degree of partial pain is relatively high. The joint tube is made of precision cold-rolled sheet. The wall thickness difference of these cold-rolled sheets is generally about 0.002 inches, so the wall thickness difference is very small, and the wall thickness of the entire pipe is very uniform. The joint tube is made of precision cold-rolled sheet. The wall thickness difference of these cold-rolled sheets is generally about 0.002 inches, so the wall thickness difference is very small, and the wall thickness of the entire pipe is very uniform.

The difference between stainless steel seamless pipes and welded pipes also includes welding performance. In general, the chemical composition of sewn pipes and seamless pipes is different. The steel composition for the production of seamless pipes just meets the basic requirements, and the stitched pipes contain chemical components suitable for welding, such as silicon, sulfur, manganese, oxygen and triangular ferrite, if these elements are missing, a simple welding firmness will be formed during the welding process.
The size of the metal particles is related to the temperature of the heat treatment and the time it is held at the same temperature. The particle size of the stitched pipe and seamless pipe after annealing is the same. If the minimum cold treated tube is selected, the particle size after welding and the particle size of the welded metal are much smaller, otherwise the size is the same.
The difference between stainless steel seamless pipes and welded pipes also includes corrosion resistance. Corrosion resistance also depends on the composition of the alloy. Seamless pipes with the same chemical composition and welded pipes with heat treatment have the same corrosion resistance. Welded parts of slotted steel pipes that have not been fully heat treated will simply corrode.
The two are also different in price, under normal circumstances, the price of welded steel pipes is not even half of seamless steel pipes, and the price is still very cheap.
In fact, if the two are combined for comparison, the welded steel pipe has more and more advantages than the seamless steel pipe. Since the welded steel pipe has passed a series of inspections and is made of cold-rolled sheet, all shortcomings are limited to the welding site. Seamless steel pipes are formed by stamping stainless steel billets, so tears in the pipe wall will be formed during kneading. In addition, through the test, in most cases, the defective product passing rate of welded steel pipes will be lower than the defective product rate of seamless steel pipes. In addition, under ultrasonic testing, it can be found that the background noise of seamless steel pipes is relatively large, so it is difficult to find defects, and the opposite is true of welded steel pipes.

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