China 45 Steel Equivalent, Mechanical Properties & Chemical Composition

Motor shaft made from 45 steel
A kinkd of motor shaft made from 45 steel

45 steel is a Chinese quality carbon structural steel, the cold plasticity is common. Annealing and normalizing are slightly better than quenching and tempering, and have high strength and good machinability. A certain degree of toughness, plasticity and wear resistance can be obtained after appropriate heat treatment. Suitable for hydrogen welding and argon arc welding, not suitable for gas welding. Preheating is required before welding, and stress relief annealing should be performed after welding.

China 45 steel = 45# steel = #45 steel

#45 Steel Mechanical Properties

  • Sample blank size: 25mm
  • Tensile strength: ≥600 MPa (N/mm2)
  • Yield strength: ≥355 MPa
  • Elongation: ≥16%
  • Rate of reduction in area: ≥40%
  • Shock absorption energy: 39J
  • Material delivery state hardness: ≤229HB; ≤197HB (Annealing)

45 Steel Chemical Composition

Chemical Composition %
Steel GradeCSiMnP (≤)S (≤)Cr (≤)Ni (≤)Cu (≤)
450.42 – 0.500.17 – 0.370.50 – 0.800.0350.0350.250.300.25


45# steel equivalent to US ASTM, European EN (Germany DIN EN, UK BS EN, France NF EN), Japanese JIS, and ISO standard.

Equivalent (For reference)
GB/T 69945ASTM A29M1045DIN EN 10083-2C45JIS G4051S45CNF EN 10083-2C45C45E4

Properties & Applications

45 steel is a common material for shaft parts. After quenching and tempering (or normalizing), it can obtain better cutting performance, and can obtain high mechanical strength such as high strength and toughness. The surface hardness after quenching can reach 45- 52 HRC.

#45 material is widely used in mechanical manufacturing and high-strength moving parts, such as turbine impellers, compressor pistons, shafts, gears, racks, steel wire and wire ropes.

40Cr steel and other alloy steels are suitable for shaft parts with medium precision and high speed. These steels have good comprehensive mechanical properties after quenching and quenching.

Tags: China 45 steel, #45 steel, 45# steel


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