310 is often used as a high-temperature resistant material because of its good high-temperature strength and low oxidation resistance at high temperatures.
In high-temperature environments, 310 heat-resistant stainless steel can maintain the stability of its own performance in all aspects and is not easily affected by some external corrosion, oxidation, and other media. This is mainly due to the high Cr content in 310 stainless steel itself. Because of the oxidizing medium, the Cr in the metal on the surface of 310 can combine with oxygen to form Cr₂O₃, and this oxide film can prevent oxidation and corrosion.
As long as the Cr content in stainless steel is sufficient, the Cr₂O₃ oxide film can continuously cover the surface of 310 steel. As the film becomes thicker and thicker, it will eventually put on a "protective coat" for 310 steel, which can prevent the internal 310 metal from contacting the outside world, thereby preventing further oxidation. This is also the main reason why 310 steel can have good anti-oxidation properties at high temperatures.

Since spiral welded pipes are piled outdoors and most of them are buried underground when in use, they are very easy to corrode and rust. In order to ensure the smooth flow of the pipeline, the spiral welded pipe must have strong corrosion resistance.
The influence of external conditions will cause spiral welded pipe corrosion. It mainly depends on the medium characteristics and temperature around the pipeline, and whether the medium around the pipeline is corrosive. Because the degree of medium corrosiveness is closely related to the various microorganisms contained in the soil. And if it is a long-distance pipeline, the soil environment is more complicated. In addition, the temperature of the environment in which the pipeline is located will also affect the corrosion of the spiral welded pipe. If the temperature is high, the corrosion rate will also accelerate, while the corrosion rate will slow down at a low temperature.

The hardness of round steel is relatively high. Some round steel is difficult to cut when cutting, which easily causes the edge of the shearing tool to crack. After the sheared bar is placed for a period of time (more than 12 hours), a through crack appears on the end face, indicating that there is a large residual stress in the bar after shearing. Stress cracking, which includes temperature stress, structural stress and deformation stress. End cracking is generally the result of the combined action of various stresses, but one of the factors is the main reason and plays a dominant role, and shearing is the direct cause or inducement.

In the case of insufficient heating, 20CrMnTi(H) has serious segregation in the microstructure, resulting in the formation of martensite and bainite in the segregation zone. When the round steel is sheared at low temperatures, the huge shear stress and shear deformation cause microcracks in the martensite and bainite in the segregation zone.