What are the classifications of alloy steel

1. Quenched and tempered steel: medium-carbon alloy steel with low content of alloying elements; high strength; used for high-temperature bolts and nuts, etc.

2. Spring steel: The carbon content is higher than that of quenched and tempered steel; after quenched and tempered, it has higher strength and higher fatigue resistance; it is used as spring material.

3. Rolling bearing steel: high-carbon alloy steel with high alloy content; high and uniform hardness and wear resistance; used for rolling bearings.

4. Alloy tool steel, also known as measuring tool steel: high-carbon alloy steel with low alloy element content; high hardness and wear resistance, good machinability and good stability; used for measuring tool materials.

5. Special performance steel: low-carbon high-alloy steel; good corrosion resistance; used for corrosion resistance, and some can be used as heat-resistant materials.

6. Heat-resistant steel: low-carbon high-alloy steel; good heat resistance; used for heat-resistant materials, and some can be used as anti-corrosion materials.

7. Low-temperature steel: low-carbon alloy steel, with high or low alloy elements according to the degree of low-temperature resistance; good low-temperature resistance; used for low-temperature materials (special steel is nickel steel).