45# steel is a carbon structural steel with the characteristics of high-quality carbon structural steel. Its corresponding international standard grades include Japanese S45C, American standard 1045 and German standard C45.
45# steel has high strength and hardness, good toughness and plasticity, and good machinability and weldability. These characteristics make 45# steel widely used in machinery manufacturing, construction, petrochemical and other fields.
The main chemical components of 45# steel include:
Carbon C: 0.42 ~ 0.50%
Silicon Si: 0.17 ~ 0.37%
Manganese Mn: 0.50 ~ 0.80%
P: ≤0.035%
Sulfur S: ≤0.035%
Chromium Cr: ≤0.25%
Nickel Ni: ≤0.25%
45# steel has superior mechanical properties, which are as follows:
Tensile strength σb (MPa) : ≥600MPa
Yield strength σs (MPa) : ≥355MPa
Elongation after fracture δ5 (%) : ≥16%
Section shrinkage ratio ψ (%) : ≥40%
Hardness HB: ≤197
45# steel is usually delivered in a normalizing state, which can produce sheets of 8-600mm thickness and guarantee its performance. After normalizing treatment, 45# steel has stronger plasticity.
In summary, 45# steel is a carbon structural steel with superior performance, and its chemical composition and mechanical properties are strictly controlled to meet the application needs of different fields.