Welding is an important link in stainless steel pipe processing and has a wide range of applications in many fields. Only by ensuring the quality of the product can the safety of the product be improved. However, welding defects are extremely unfavorable factors in production, and stainless steel pipe cracks are a common and very dangerous defect. It not only makes the product scrapped, but also may cause major accidents. Therefore, it is necessary to find out the cause of the welding crack of the stainless steel pipe.
Stainless steel contains a variety of metal elements, such as chromium, nickel, carbon, iron, etc. It is precisely because of their existence that it has good ductility and corrosion resistance. However, if the carbon content in the stainless steel tube is high, the material will be harder. Because the 304 stainless steel pipe is hard and not easy to weld, cracking may occur after welding.
If the welding material is used improperly, the steel pipe itself will not be able to support itself, and creep will occur under high temperature and high load. The embrittlement of the austenitic welded joint and the thermal stress deformation caused by high temperature condensed water will also lead to deformation and cracking of the stainless steel pipe. .
The stainless steel tube is cracked. The possible reason is that the stainless steel tube is too thin. There is another reason. The stainless steel you bought is not 304 or 316, but 201, 202. The nickel content of the type does not meet the standard, that is, it will produce The rusty stainless steel; if you guessed it right, it should be hydrogen embrittlement. Hydrogen penetrates into the metal structure in the form of atoms, and then combines carbon to cause metal decarburization, and then causes this cracking phenomenon. If you find cracks, replace them as soon as possible. It is very dangerous, especially in the case of high temperature and high pressure.