High quality structural steel
This type of steel must ensure both chemical composition and mechanical properties. Its grade is a two-digit number representing the mass fraction of the average carbon in the steel (wÑ Ã— 10000). For example, 45 steel means that the average carbon mass fraction in steel is 0.45%; 08 steel means that the average carbon mass fraction in steel is 0.08%.
High quality carbon structural steel is mainly used in the manufacture of machine parts. It is generally subjected to heat treatment to improve mechanical properties. There are different uses depending on the carbon mass fraction. 08, 08F, 10, 10F steel, high plasticity, high toughness, excellent cold forming properties and welding performance, often cold rolled into thin sheets, used to make cold stamping parts on instrument casings, automobiles and tractors, such as car body, tractor The cab, etc.; 15, 20, 25 steel is used to make carburized parts with small size, light load, surface wear resistance, and low core strength requirements, such as piston pins, prototypes, etc.; 30, 35, 40, 45, 50 steel has good comprehensive mechanical properties after heat treatment (quenching + high temperature tempering), that is, it has high strength and high plasticity and toughness. It is used to make shaft parts. For example, 40 and 45 steel are often used in manufacturing. Automobiles, tractor crankshafts, connecting rods, general machine tool spindles, machine tool gears and other shaft parts with little force; 55, 60, 65 steel heat treatment (quenching + medium temperature tempering) has a high elastic limit, often used in production Springs with small load and small size (small size less than 12~15mm), such as pressure regulating and speed regulating springs, plunger springs, cold coil springs, etc.
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