Composition of Stainless steel

Stainless steel is an alloy of iron that contains a variety of chemical elements, each of which plays a role as well as a function to characterize the product. Here are some key elements involved in the composition of stainless steel.
1. Fe - Iron
2. C - Carbon
3. Cr - Crom
4. Ni - Nickel
5. Mn - Manganese
Mo - Molybdenum
In addition to the main elements, there are many other elements involved in the composition as Si, Cu, N, Nb, S ... Here we learn about some of the major elements.

Fe - IRON
Fe - Iron is the main ingredient in stainless steel. In essence, stainless steel is an alloy of iron. So, iron accounts for a very large proportion.
Iron is the world's most produced metal, accounting for nearly 95% of the metal produced worldwide. They have good characteristics of bearing strength, flexibility, hardness that very few metals can replace. They are used in many different industries: construction, bridges, cars, ships and many different industries.
Steel is the most famous alloy of iron, they are also produced and used quite widely.
C - Carbon
Carbon is an indispensable component of stainless steel. It is available in many groups, many types of stainless steel - different stainless steel. However, the C content is usually low. The effect of carbon is to resist corrosion.
If carbon is combined with chromium in the alloy, it hurts the inert layer. In other local areas, if chromium is <10.5% then "inert layer" will not form.

Cr - Crom
As we all know, stainless steel is an alloy of iron containing at least 10.5% Cr. So, Cr is an indispensable component of any kind of stainless steel. Because Cr is highly reactive element. Thus, they create the "inert" nature of this alloy. Cr also has the effect of preventing corrosion and rust that normally occur with carbon steel without external protection.
With a carbon content of> 10.5%, the alloy will create a protective surface that prevents oxidation of the surface and oxidation of iron. The higher the chromium content, the better the degree of rust. That is why stainless steel plates or stainless steel rolls made of stainless steel 304 is better than other types.

Ni - Niken
Nickel is the main alloy of Austenitic stainless steel (Group 3XX). The presence of nickel causes this group to have high toughness, good durability even at cooling temperature.
In addition, nickel is a non-magnetic substance, so they also contribute significantly to the nature of the steel is not very poor effect, such as some types of stainless steel, 304 stainless steel rolls, almost no effect on the word calculated. In addition, nickel also helps in blocking the attack of acids, especially sulfuric acid H2SO4.
Mn - Manganese
As in the 3XX group, nickel plays an important role, for the 2XX group, manganese is an indispensable element. Manga is the replacement for nickel in these 2XX grades. Manganese's main effect is to help deoxidizing stainless steel, in addition to stabilizing the austenitic steels.
Mo - Molybdenum
Molybdenum is an additive, they are added to stainless steel groups containing Cr - Fe - Ni elements to prevent local corrosion and cracking, cracking.
Molybdenum also has anti-heat effect, which is why 316 stainless steel (2% molybdenum) is better than 304 stainless steel in marine environments. The higher the amount of molybdenum, the higher the chloride resistance.

Source: inoxdaiduong.com/en/