The corrosion resistance of 304 stainless steel seamless pipe depends on the amount of chromium added.
2023-05-14 06:08:41
The corrosion resistance of 304 stainless steel seamless pipe depends on the amount of chromium added. The corrosion resistance of stainless steel seamless pipes is different. All metals react with oxygen in the atmosphere to form an oxide film on the surface. Unfortunately, the iron oxide formed on ordinary carbon steel continues to oxidize, causing the rust to expand and eventually form pores. The carbon steel surface can be ensured by electroplating with paint or oxidation resistant metals (e.g., zinc, nickel, and chromium), but as is known, this protection is only a film. If the protective layer is destroyed, the underlying steel begins to rust. The corrosion resistance of stainless steel seamless pipes depends on chromium, but because chromium is one of the components of steel, the protection methods are not the same. When the amount of chromium added reaches 10.5%, the atmospheric corrosion resistance of the steel is remarkably increased, but when the chromium content is higher, although the corrosion resistance is still improved, it is not obvious. The reason is that when chromium is used to alloy steel, the type of surface oxide is changed to a surface oxide similar to that formed on pure chromium metal. This tightly adhering chromium-rich oxide protects the surface from further oxidation. This oxide layer is extremely thin, through which you can see the natural luster of the steel surface, giving the seamless tube a unique surface. Moreover, if the surface layer is damaged, the exposed steel surface will react with the atmosphere to repair itself, and the "passivation film" is reformed to continue the protection. Therefore, all stainless steel pipes have a common characteristic, that is, the chromium content is more than 10.5%. There are usually only six types of steels associated with the application of building construction. They all contain 17-22% chromium, and the preferred steel grade also contains nickel. The addition of molybdenum further improves atmospheric corrosivity, particularly corrosion resistance to chloride-containing atmospheres.
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