Due to the fact that steel is transformed into finished products through pressure processing and heat treatment of steel ingots or billets before being put into use, it is necessary to first understand the classification of steel. There are many classification methods for steel, and the commonly used ones are as follows:
- Classified by chemical composition
Steel can be divided into two categories based on its chemical composition: carbon steel and alloy steel.
carbon steel
Due to different carbon contents, it can be divided into:
(1) Industrial pure iron carbon content: ≤ 0.04%;
(2) Low carbon steel with a carbon content of ≤ 0.25%;
(3) Medium carbon steel with a carbon content of 0.25-0.60%;
(4) High carbon steel with a carbon content greater than 0.60%;
Alloy steel
According to the amount of alloying elements contained in steel, it is divided into
(1) The total amount of alloying elements in low-alloy steel is ≤ 5%;
(2) The total amount of alloying elements in medium alloy steel is 5-10%;
(3) The total amount of alloying elements in high alloy steel is greater than 10%.
(4) Three-element alloy steels such as manganese steel, chromium steel, silicon steel, etc
(5) Quaternary alloy steels such as silicon chromium steel, chromium-nickel steel, etc
(6) Diversified alloy steels such as chromium manganese molybdenum steel, chromium manganese titanium steel, etc
In addition, steel can also be classified into manganese steel, chromium steel, chromium manganese titanium steel, etc. based on the type of alloying elements contained in the steel.