• Improper welding of X80 pipeline may cause cracks
• Brief introduction of API X52 pipeline steel
• The difference between PSL1 and PSL2
• Harm of inclusions in X70 pipeline steel
• API 5L pipeline pipe
• X52 steel plate surface quality standards that need to be met
• The basic production process of API 5L X60 pipeline steel
• The key to Q460D steel welding process
• What does the heat treatment of Q690 Steel include?
• Reasons for choosing Q690D steel

Causes of cracks in 310S stainless steel

310S stainless steel is a high-chromium and high-nickel austenitic stainless steel. Compared with ferrite and martensitic heat-resistant steel with body-centered cubic structure, it not only has excellent corrosion resistance and mechanical properties, but also has excellent high-temperature oxidation resistance. properties and creep resistance. The stainless steel is mainly used in high temperature furnace, petrochemical industry, machinery industry, aerospace and other fields. There are a large number of surface crack defects on the surface of the 310S stainless steel plate after pickling. The low-magnification microstructure inspection and surface penetration inspection of the continuous casting billet were carried out, and then the scanning electron microscope (SEM) analysis was carried out on the hot-rolled steel plate with crack defects. , Finally, the surface crack defects of 310S stainless steel were eliminated by changing the hot rolling process.

From the above analysis, it can be seen that the reason for surface cracks is that the deformation resistance of the two-phase structure produced during the rolling process of 310S stainless steel is different. To eliminate cracks, it is necessary to make the hot-rolled structure of 310S stainless steel as simple as possible, and the steel plate is fully recrystallized or completely rolled. institutional organization.

In the process of thermal deformation, whether dynamic recrystallization can occur mainly depends on the amount of deformation, deformation temperature and deformation rate. The occurrence of dynamic recrystallization of 310S stainless steel is not only related to the amount of deformation, but also related to temperature and strain rate. The higher the temperature, the lower the strain rate, which can promote the dynamic recrystallization of the material.

The 310S stainless steel plate with defects loses heat quickly during the hot rolling process, and the final rolling temperature is about 900 ° C. According to the dynamic recrystallization theory, it is extremely difficult to realize all dynamic recrystallization during the hot rolling process.