The composition, structure and organization of steel determine the properties of steel. They are not only mutually different, but also mutually penetrated, and they restrict each other to varying degrees. The various properties of steel are controlled by these three internal factors, and their degree or size is different. Of course, chemical composition should be the basis, and only on this basis can we talk about the role of structure and organization. When the chemical composition is given, certain properties of steel are mainly controlled by the structure type. The same is true for stainless steel.

In order to improve and enhance certain properties of steel and make it obtain certain special properties, the elements added intentionally are called alloying elements during the refining process. The alloying elements used are nickel, manganese, nitrogen, titanium, niobium, silicon, molybdenum, copper, tungsten, vanadium, aluminum, aluminum, cobalt, cobalt, boron, rare earth elements, etc. Phosphorus, sulfur, nitrogen, etc. are generally regarded as harmful elements in steel, but in some cases they also act as alloying elements. The content of alloying elements in steel is different, some are as high as tens of percent, such as chromium, nickel, manganese, etc.; some are as low as a few ten thousandths, such as boron, and its composition and content are determined according to needs. Differences.

The role of alloying elements in steel with the two basic components of iron and carbon, as well as their interaction with each other, affects the constituent phases, organization and structure of steel, and promotes beneficial changes, thereby improving and improving steel The comprehensive properties of steel, significantly improve and improve the process properties of steel, such as penetration, tempering stability, machinability, formability and weldability, etc.; it can also enable steel to obtain some special physical and chemical properties, such as resistance Heat, stainless, corrosion resistant, etc. The improvement and acquisition of these properties are partly directly affected by the addition of alloying elements, and most of them are heat treatment of the steel caused by the phase transformation process of the alloying elements affecting the steel, which is also a very important measure to improve performance), alloying elements The role played is related to the differences in its own atomic structure, atomic size and crystal lattice.

There are a lot of alloying elements in stainless steel, such as chromium, nickel, manganese, titanium, niobium, nitrogen, silicon, aluminum and copper. Understanding the role of alloying elements in steel can help us understand the different characteristics of various steel types, thereby laying a theoretical foundation for the correct use of steel.