Stainless steel screws and bolts composition analysis

This issue: the role of the main components of stainless steel

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Austenitic stainless steel is the most important class of stainless steel, its production and use of 70% of the total amount of stainless steel, and widely used in various industrial fields and daily consumption. In austenitic stainless steel, in addition to the basic elements of steel, iron, there are many other elements, they have an important impact on the performance and organization of stainless steel.

Below, let’s take a look at the main components of stainless steel play what role.

The role of chromium

Chromium is one of the most important elements in the composition of stainless steel, each stainless steel contains a certain amount of chromium, the fundamental reason is to add chromium to the steel, prompted by the development of its corrosion resistance. This is because the stainless steel containing chromium and the surface of the formation of a very thin protective film of chromium oxide, this film separates the external oxygen and thus play a role in corrosion resistance.

The role of nickel

Nickel is the main alloying element in stainless steel, the main role is to form and stabilize the austenite, so that the steel has good strength, plasticity and toughness with the cold, hot workability and cold forming and welding, low temperature and non-magnetic and other excellent performance. The increase in nickel content is conducive to improving the cold working and forming properties of austenitic stainless steel.

The role of carbon

Carbon is one of the main elements of industrial steel, carbon in stainless steel on the organization of the impact is mainly manifested in two aspects, on the one hand, carbon is an element that stabilizes the austenite, and the role of a large degree, on the other hand, due to the affinity of carbon and chromium is very large, it will form a series of complex carbides with chromium. Therefore, from the point of view of both strength and corrosion resistance, the role of carbon in stainless steel is contradictory, so we can start from the different requirements of use, choose different carbon content of stainless steel.

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