Stainless steel pipes must be bent both in the pipe making and in the later stage, and cracks will occur during flaring, mainly due to problems in the material and pipe making process. In order to reduce the damage to the manufacturer, and also prevent customers from deep processing after purchase, resulting in a large amount of waste, we have summarized the following precautions in the production process of more than ten years to prevent the cracking of stainless steel pipes.
1. Resist inferior raw materials
The quality of steel is the basis for determining the quality of stainless steel pipes. According to the copper content, it can be divided into two materials: low copper, medium copper and high copper. The ductility effect of stainless steel pipes produced by this method increases in turn, and the price will also increase. Increase accordingly. Since there are many stainless steel brands on the market, and the prices of similar products are almost the same, some manufacturers choose to use intermediate frequency furnace raw materials, which are actually forged strips from stainless steel scraps. Such materials have many impurities, high carbon content and hardness. High, so during processing, cracks are prone to occur after long-term use.
2. High quality protective material
During the annealing process, the steel strip is of good quality due to insufficient furnace temperature and too short annealing time. During the welding process, cracks will occur due to thermal expansion and contraction and work hardening.
3. Prevent excessive grinding of welding
Cracks appear in the welding process of stainless steel pipes. It may also be due to excessive polishing of the welds, resulting in too thin welds. Therefore, cracks during processing and use are all product quality problems. Excellent stainless steel pipe factories often The quality of the products is strictly controlled, and they have their own corresponding product certificates.
4. Need to add nitrogen for welding
In the welding process, if the stainless steel welded pipe is not protected by nitrogen, it is easy to produce defects such as rust and cracks. Adding nitrogen during the internal welding process can effectively protect the internal and external welds of the stainless steel pipe, and it is not easy to crack, and at the same time reduces the thin-walled stainless steel. Pipe rust problem.
5. Welds that require penetration
In the welding process, if the power-on speed is too fast and the welding time is too short, the stainless steel pipe will not be able to penetrate through, which will affect the quality of the steel pipe and cause cracks.
During the welding process, attention should be paid to prevent cracking of stainless steel products, reject inferior raw materials, do not use inferior materials, anneal materials, avoid excessive grinding of welding, add enough nitrogen before welding to penetrate through, and do all these precautions, it is possible to have a high probability Prevent the stainless steel pipe from cracking after production or deep processing in the pipe making.