1. Classification by alloy composition :
Tungsten steel: A special steel containing tungsten element with very high hardness. It is often used to manufacture metal processing tools, knives, etc. It can withstand high cutting forces and wear and is suitable for processing scenarios with extremely high requirements for hardness and wear resistance.
Manganese steel: With the addition of manganese alloy elements, it has high hardness and good toughness. It can be used to manufacture tractor tracks, axles and other parts that are subjected to greater pressure and wear. It is widely used in engineering machinery, agricultural machinery and other fields.
Molybdenum steel: The addition of molybdenum makes the steel have good high temperature resistance and high strength. It is often used to manufacture aircraft crankshafts, special hard tools working under high temperatures, etc. It can maintain good mechanical properties under high temperature and high pressure environments.
Tungsten-chromium steel: Contains two alloy elements, tungsten and chromium, and has both high hardness and strong toughness. It is suitable for making machine tool tools, molds and other tools and parts that have high requirements for hardness and toughness.
Nickel-chromium steel (stainless steel): Mainly composed of nickel, chromium and other elements, it has good corrosion resistance and is not easy to oxidize. It is widely used in acid-resistant towers in chemical production, medical equipment, daily necessities and other fields with high requirements for corrosion resistance.
2. Classification by performance characteristics:
High-strength steel: It has high strength and hardness and can withstand greater stress and load. For example, high-strength steel used in building structures can reduce the amount of steel used while improving the safety and stability of buildings; in machinery manufacturing, high-strength steel can be used to manufacture heavy-loaded parts, such as crane arms and transmission shafts of large machinery.
Heat-resistant steel: It can maintain good mechanical properties and anti-oxidation properties in high temperature environments, and is suitable for manufacturing parts for high-temperature furnaces, heat exchangers, engines and other equipment. For example, turbine blades of aircraft engines and blades of gas turbines all require heat-resistant steel to ensure normal operation in high temperature and high pressure working environments.
Corrosion-resistant steel: It has excellent corrosion resistance and can be used for a long time in harsh corrosive environments, such as marine engineering, chemical equipment, sewage treatment and other fields. In the marine environment, corrosion-resistant steel can be used to manufacture offshore platform structural parts, ship hulls, etc.; in the chemical industry, it is used to manufacture pipelines and containers for storing and transporting corrosive media .
Wear-resistant steel: It has high hardness and good wear resistance, and is suitable for occasions subject to wear, such as mining machinery, construction machinery, railway tracks, etc. The hammer head and liner of the mining crusher, the bucket of the excavator and other parts all need to use wear-resistant steel to improve the service life and production efficiency of the equipment .
Weathering steel: It has good corrosion resistance and weathering resistance in the atmospheric environment. After long-term exposure, a dense oxide film will form on its surface to prevent further corrosion of the internal steel. Weathering steel is often used in outdoor facilities such as building structures, bridges, and railway vehicles. It can reduce maintenance costs and has a unique appearance.
3. Classification by purpose:
Alloy steel for engineering structures: used for engineering and building structures, including weldable high-strength alloy structural steel, alloy steel bars, alloy steel for railways, alloy steel for geological and petroleum drilling, alloy steel for pressure vessels, high manganese wear-resistant steel, etc. This type of steel has a low total alloy content, but is produced and used in large quantities, and is mainly used for structural parts that bear large loads and stresses.
Alloy steel for mechanical structure: suitable for manufacturing machines and mechanical parts. On the basis of high-quality carbon steel, one or more alloying elements are added to improve the strength, toughness and hardenability of the steel. Including commonly used alloy structural steel, alloy spring steel, quenched and tempered alloy steel, surface hardened alloy steel (carburizing steel, nitrided steel, surface high-frequency quenching steel, etc.), alloy steel for cold plastic forming (cold forging steel, cold extrusion steel, etc.).
Tool steel: used to make various tools, such as knives, molds, measuring tools, etc. According to different working conditions, tool steel can be divided into carbon tool steel, alloy tool steel and high-speed tool steel. Carbon tool steel has low cost and good cutting processability, but poor red hardness; alloy tool steel and high-speed tool steel have higher hardness, wear resistance and hot hardness, and are suitable for high-speed cutting and high-precision processing.
Special performance steel: In addition to the heat-resistant steel and corrosion-resistant steel mentioned above, it also includes steels with special physical properties, such as soft magnetic alloys, deformable permanent magnetic alloys, elastic alloys, expansion alloys, thermal bimetals, resistance alloys, thermocouple alloys and other precision alloys .
Special steels are classified into the above categories. If you want to know more about the classification and characteristics of special steels, you can contact Jiangsu Tisco Meta l for more consultation and professionals will provide you with services.