Corrosion resistance of stainless steel plate
Date:2022-10-24View:468Tags:
While stainless steel is easier to remove surface stains than other iron-based metals, just like standard steel, stainless steel can be marked by fingerprints and grease, develop discoloration, and eventually rust. The difference is elasticity. Stainless steel can withstand more time and corrosion before showing signs of wear.
All steels have the same basic iron and carbon composition, but stainless steel sheets also contain suitable levels of the alloying element chromium, which gives stainless steel its famous corrosion resistance.
This is where things get complicated. There are many grades of stainless steel sheets, each with different alloy compositions, so their physical properties are also different.
Stainless steel plates must contain at least 10.5% chromium. Depending on the grade, some stainless steels may also contain higher chromium content, as well as other alloying components such as molybdenum, nickel, titanium, aluminum, copper, nitrogen, phosphorus and selenium.
The two most common stainless steel plate materials are 304 and 316. The key difference is the addition of molybdenum, an alloy that can significantly enhance corrosion resistance, especially in environments with more salt water or chloride exposure. 316 stainless steel contains molybdenum, while 304 stainless steel does not.
So for outdoor products like tracks and bollards. 304 stainless steel is the most economical and practical choice in most application environments. Although it does not have the chloride resistance of 316, the price of 316 stainless steel is slightly higher. In areas with high chloride exposure, especially coastal and severe Salted roads are a lot worth it. Each stainless steel sheet application has its own unique requirements that require stainless steel sheet to achieve the task.
Corrosion is a natural phenomenon. Pure elements always react with their surroundings, that is, very few elements are found naturally in pure form, and iron is no exception.
In wet or humid conditions, iron reacts with the oxygen contained in the water to form iron oxide, also known as rust. The red flaky oxide deteriorates easily, leaving more material exposed and corroded. Iron and standard carbon steel are sensitive to this type of corrosion. Stainless steel has the innate property of forming a passivation layer to prevent corrosion.
