China 45 Steel Equivalent, Mechanical Properties & Chemical Composition

China 45 Steel

Chinese GB standard 45 steel is a 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

Data Sheet & Specification

45 Steel Chemical Composition

Chemical Composition %
Steel Grade C Si Mn P (≤) S (≤) Cr (≤) Ni (≤) Cu (≤)
45 0.42-0.50 0.17-0.37 0.50-0.80 0.035 0.035 0.25 0.30 0.25

#45 Steel Mechanical Properties

  • Sample 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)

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.

Equivalent Grade

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

Equivalent (For reference)
China USA European Japan ISO
Standard Grade Standard Grade Standard Steel name (Steel number) Standard Grade Standard Grade
GB/T 699 45 AISI SAE, ASTM A29M 1045 steel EN 10083-2 C45 (1.0503) JIS G4051 S45C C45

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

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