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Why doesn't stainless steel rust?
Time:2019-07-15 Source: Hits:

Why doesn't stainless steel rust?

Stainless steel is a generic term for steels that have stable chemical properties in corrosive media. Corrosive media generally refers to weak media such as air, steam, and water.

The essence of stainless steel with good corrosion resistance is the addition of an important chemical element, chromium, to the iron-carbon alloy. The presence of chromium not only gives the steel a non-rusting property, but also allows other trace elements such as children. The properties of aluminum, silicon and nickel give the steel a corrosion-resistant property.

Therefore, the presence of chromium is the key to the non-rusting of steel. How much chromium does the steel need to meet the minimum standard of rust? In fact, the experimental results have obtained that the minimum standard of chromium required for stainless steel has different standards due to different corrosive media, and the standards of various countries in the industry are also inconsistent.

The standard given by different countries

Country 
Industry Standard 
Min Standard(Cr)
Japan 
JIS G 0203 
11%
Germany 
DIN 
10.5%
American 
AISI 
4%
Europe
EN 10020 10.5%
China 
GB/T 12%









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