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2023

Custom carbon steel castings manufacturers take you to understand the corrosion resistance of precision casting

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Custom carbon steel castings manufacturers tell you that all metals react with oxygen in the atmosphere to form an oxide film on the surface. Unfortunately, the iron oxide that forms on typical carbon steels continues to oxidize, allowing the corrosion to expand and form holes. Carbon steel surfaces can be secured by galvanic paint or oxidation-resistant metals such as zinc, nickel and chromium. However, as we all know, this protection is only a thin film. If the protective layer is damaged, the steel underneath will start to rust.

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Custom carbon steel castings manufacturers tell you that the corrosion resistance of stainless steel castings depends on chromium, but the protection method is different because chromium is one of the components of steel. When the amount of chromium added reaches 10.5%, the atmospheric corrosion resistance of steel increases significantly, but when the chromium content is high, although the corrosion resistance can still be improved, it is not obvious.
The reason is that when alloying steel with chromium, the type of surface oxide is changed to a surface oxide composed of pure chromium metal. This tightly adhered chromium-rich oxide protects the surface from further oxidation. Custom carbon steel castings manufacturers tell you that this oxide layer is extremely thin, through which the natural luster of the steel surface can be seen, making stainless steel castings have the same surface. Moreover, if the surface is damaged, the exposed steel surface reacts with the atmosphere to repair itself, forming a "passive film" of this oxide from the beginning, which continues to protect.
Therefore, all stainless steel casting elements have the same feature, that is, the chromium content is above 10.5%. What are the advantages of precision casting? The manufacturer of Custom carbon steel castings tells you that the standard precision of castings is high, the general linear public service is 1%, the angular public service is: ±1/2 degrees, and the surface finish can reach Ra1.6-3.2, which can save material and machining costs.