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High-quality steel (falling between special steel and ordinary carbon steel, generally free of alloys): It refers to steel with good mechanical properties, including high tensile and compressive strength as well as good toughness; it is easy to machine, and its mechanical properties improve significantly after heat treatment. In terms of composition, such steel contains few impurities and has fine, uniform grain structure. Common high-quality steels include carbon alloy steel, alloy structural steel, die steel, spring steel, high-quality round steel, high-strength tool steel, bearing steel, high-carbon steel, gear steel, carbon structural steel, alloy structural steel, tube billet steel, roll steel, and alloy structural steel, among others. Carbon structural steel: Simply put, it is high-quality carbon structural steel, also referred to as carbon structural steel ； Specifically, its carbon content is less than 0.08%. Low-carbon steel is used for rolling thin sheets and deep-drawn products ； Medium-carbon alloy steel is used to manufacture quenched and tempered parts with moderate dimensions, including tie rods, bushings, gears, piston pins, fasteners, etc ； High-carbon nodular steel is used for manufacturing springs and parts that require wear resistance. Alloy steel: Steel used for mechanical parts and various engineering components, containing one or several alloying elements in specified amounts. It can be divided into ordinary alloy structural steel and special-purpose alloy structural steel. Alloy structural steel is widely used in the structures of ships, vehicles, aircraft, missiles, weapons, railways, bridges, pressure vessels, machine tools, and more. Mold steel can be roughly divided into three categories: (cold working mold steel), (hot working mold steel), and (plastic mold steel), which are used in forging, stamping, cutting, die-casting, and other processes. Spring steel refers to steel that is specifically used for manufacturing springs and elastic components due to its elasticity in the quenched and tempered state. Bearing steel is the steel used to manufacture balls, rollers, and bearing rings. Bearings are subjected to great pressure and friction during operation; therefore, bearing steel is required to have high and uniform hardness and wear resistance, as well as a high elastic limit. Gear steel is a general term for steels that can be used to manufacture gears. Gear steel is one of the key materials among the special alloy steels used in automobiles, railways, ships, and construction machinery; it is the material used to manufacture the core components that ensure safety. 2 Common Types of \"Special Steels\" Special steels: There is no unified definition or concept for special steels worldwide. Generally, special steels are considered to be those that have a specific chemical composition (with one or several alloying elements added to carbon steel), are produced using special manufacturing processes, possess unique microstructures and properties, and can meet particular requirements. Compared to ordinary steel, special steel possesses higher strength and toughness, as well as improved physical, chemical properties, biocompatibility, and processability. It features high strength and hardness, good plasticity and toughness, wear resistance, corrosion resistance, and many other excellent properties. 1. Tungsten steel, manganese steel: highly hard; used to manufacture metal processing tools, tractor tracks, and axles, etc. 2. Manganese silicon steel: It has particularly high toughness and is used to manufacture spring leaves, spring coils, etc. 3. Molybdenum steel: resistant to high temperatures; used for manufacturing airplane crankshafts and particularly hard tools, etc. 4. Tungsten-chromium steel: high hardness and great toughness; used for machine tool cutters and molds, etc. 5. Nickel-chromium steel (stainless steel): It has strong corrosion resistance and does not oxidize easily; it is used to manufacture acid-resistant towers in chemical production, medical devices, and everyday items. Special steel is the primary type of steel used in most sectors of the national economy, including machinery, automotive industry, military manufacturing, chemical industry, home appliances, shipbuilding, transportation, railways, and emerging industries. China’s special steel industry is responsible for producing the special steel varieties required by defense and military industries, high-tech industries, as well as key sectors such as machinery and automobiles.