Steel that does not rust is usually taken literally as stainless steel, but technically it is not.
We usually will not rust in the atmosphere, fresh water and other weak corrosive medium steel is called stainless steel, and will be in acid, alkali, salt, seawater and other harsh corrosive medium corrosion resistant steel is called acid steel.
The former is not necessarily resistant to harsh corrosive medium corrosion, while the latter all contain enough chromium to have the rust resistance.
Therefore, stainless steel is the two together, also known as stainless acid steel.
The research shows that with the increase of chromium content in steel, the corrosion resistance of steel is improved. When the chromium content reaches a certain proportion, the steel surface will automatically form a colorless transparent and smooth chrome-rich oxide film with extremely thin thickness to prevent the rust of steel.
The film is so stable that it can quickly repair itself if damaged, and is called a self-passivating film.
The corrosion resistance of stainless steel depends on the alloying elements contained in the steel, while chromium is the basic element that makes stainless steel corrosion resistant.
In addition to chromium, common alloy elements are nickel, molybdenum, titanium, niobium, copper, nitrogen, etc., to meet the various USES of stainless steel structure and performance requirements.
More macro prosperous stainless steel information please visit: http://www.hongwangstainless.com
Post time: Dec-24-2019