Chinese Steel GB 45 Steel
Chinese standard GB 45 steel is a quality carbon structural steel, 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 suitable heat treatment. Suitable for hydrogen welding and argon arc welding, not suitable for gas welding. Preheating is required before welding and stress relief annealing must be performed after welding.
Chinese steel 45 = steel 45# = steel #45
Datasheet and specifications
45 Chemical Composition of Steel
| Chemical composition % | ||||||||
| Steel Grade | W | Yes | 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 Mechanical Properties of Steel
- Sample size: 25mm
- Tensile strength: ≥600 MPa (N/mm2)
- Yield strength: ≥355 MPa
- Elongation: ≥16%
- Area reduction rate: ≥40%
- Shock absorption energy: 39J
- Material delivery state hardness: ≤229HB; ≤197HB (annealing)
Properties and applications
45 steel is a common material for axle parts. After quenching and tempering (or normalizing), better cutting performance can be obtained, and high mechanical strength can be obtained, 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 wires and steel cables.
40Cr steel and other alloy steels are suitable for medium precision and high speed shaft parts. These steels exhibit good comprehensive mechanical properties after quenching and tempering.
Equivalence
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 | Note | Standard | Note | Standard | Steel name (steel number) | Standard | Note | Standard | Note |
| 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
