Reasons why stainless seamless steel pipe cracks

The cracking problem of stainless steel welded pipes indicates that there is a problem with the quality of the stainless steel welded pipes. The quality of stainless steel welded pipes is determined by the raw material steel strips. Good stainless steel pipe manufacturers choose steel strips produced by refining furnaces of large factories in the selection of raw materials. The main reasons why stainless steel welded pipes crack are as follows:

1. Inferior raw material steel strip

The quality of stainless steel strips is the basis for determining the quality of stainless steel welded pipes. According to the level of copper content, it can be divided into low copper materials, medium copper materials and high copper materials. The ductility effect of the stainless steel pipes produced in this way is gradually enhanced, and at the same time The price will also increase accordingly. Because there are many brands of stainless steel pipes on the market and peers are lowering prices with each other, profits are getting thinner and thinner. Therefore, some unscrupulous manufacturers choose to use intermediate frequency furnace materials. In fact, they use recycled stainless steel scraps to reprocess and forge steel strips. This material contains many impurities. It has high carbon content and high hardness, so it is prone to cracking after processing and use for a long time.

2. Stainless steel strip is extremely hard

When the stainless steel strip is tempered, the temperature in the furnace is not enough, causing the stainless steel strip to be too hard. During the welding process, it will also break due to thermal expansion and contraction.

3. Excessive polishing of stainless steel welds

If the weld seam of stainless steel welded pipe cracks, it may also be because the stainless steel weld seam has been excessively polished, resulting in the weld seam being too thin, so cracking occurs during processing and use. This is a quality problem of the product. Good stainless steel pipes Manufacturers often strictly control the quality of their products and have corresponding product certificates.

4. No nitrogen is added to the welds of stainless steel welded pipes

If the stainless steel welded pipe is not protected by nitrogen during welding, the stainless steel welded pipe is also prone to rust, pipe cracking and other problems. Adding nitrogen can protect the internal weld bead of the stainless steel welded pipe, making it more thorough and less likely to crack. It also reduces the problem of stainless steel welded pipes rusting.

5. The stainless steel pipe welding joint is not fully welded

When welding stainless steel welded pipes, if the startup speed is too fast and the welding time is too short, the welding joint will not be penetrated, which will also affect the quality of the stainless steel welded pipes and lead to the problem of cracking of the stainless steel welded pipes.

How to choose the right stainless steel seamless pipe manufacturer

First, you should understand the strength and qualifications of the steel pipe manufacturer, and whether it has a relatively good reputation in the industry; secondly, you must understand the specific specifications and performance of the manufacturer.

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