Alloy steel is a special-purpose steel formed by adding a certain amount of alloying elements to Fe-C alloy steel.
The classification of alloy steel is usually classified according to its use, content of alloying elements, metallurgical quality, etc. Classified according to its use, metallurgical quality, etc.
Classification of alloy steel
1. According to the total amount of alloy elements, the total amount of alloys < 5 is called low alloy steel, 5% ≤ total amount of alloys < 10% is called medium alloy steel, and the total amount of alloys ≥ 10% is called high alloy steel.
2. According to the main alloy elements, such as: 3Cr3MoW2V steel is called chromium-tungsten-silicon steel.
The grade of alloy steel
The first digit indicates the carbon content wc, if it is a one-digit number, it is expressed as a thousandth fraction, if it is a two-digit number, it is expressed as a ten thousandth fraction, if there is no number, it means wc≈1% ); when the average carbon content wc ≤ 0.08%, use "0" to indicate, when the average carbon content wc ≤ 0.03%, use "00" to indicate.
The number behind the element indicates the average percentage content of the element. No figure indicates that the content of the element is less 1.5%. Taking 8Cr2MnWMoVS as an example, 8 means wc≈0.8%, Cr2 means wc≈2%, and the contents of Mn, W, Mo, V, and S are all < less 1.5%.
