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Structural alloy steel refers to the steel used as mechanical parts and various engineering components and containing one or more certain amount of alloy elements. Alloy structural steel has proper hardenability. After appropriate metal heat treatment, the microstructure is uniform sorbite, bainite or very fine pearlite. Therefore, it has high tensile strength and yield ratio (generally about 0.85), high toughness and fatigue strength, and low toughness brittleness transition temperature. It can be used to manufacture machine parts with large section size.
Grade |
Standard |
38Cr2, 46Cr2, 34Cr4, 34CrS4, 37Cr4, 37CrS4, 41Cr4, 41CrS4, 25CrMo4, 25CrMoS4,34CrMo4, 34CrMoS4,42CrMo4, 42CrMoS4, 50CrMo4, 34CrNiMo6, 30CrNiMo8, 35NiCr6, 36NiCrMo16, 39NiCrMo3, 30NiCrMo16-6,51CrV4, 20MnB5, 30MnB5, 38MnB5, 27MnCrB5-2, 33MnCrB5-2, 39MnCrB5-2 |
EN 10083-3 |
16Mo3, 18MnMo4-5, 20MnMoNi4-5, 15NiCuMoNb5-6-4, 13CrMo4-5, 13CrMoSi5-5, 10CrMo9-10, 12CrMo9-10, X12CrMo5, 13CrMoV9-10, 12CrMoV12-10, X10CrMoVNb9-1 |
EN 10028-2 |