45# Steel (Chinese Standard GB/T 699)
- Chemical composition:
-Carbon (C): 0.42% ~ 0.50%
-Manganese (Mn): 0.50% ~ 0.80
-Silicon (Si) : 0.17% ~ 0.37
-Phosphorus (P): ≤ 0.035
-Sulphur (S): ≤ 0.035
- Mechanical Properties (typical values)
-Tensile strength (Rm): 570 - 790 MPa
-Yield strength (Rel): 335 - 480 MPa
-Elongation (A): ≥ 16
-Impact work (Akv): (at room temperature) typically above 30 J
- Characteristics:
-Good Mechanical Properties: Suitable for parts requiring a certain degree of strength and toughness.
-Ease of machining: good machinability, mechanical properties can be further improved by heat treatment.
-Weldability: good weldability under proper preheating conditions.
- Application areas:
-Machinery manufacturing: used to manufacture various mechanical parts, such as shafts, gears, connecting rods, etc..
-Automotive industry: used to manufacture automotive parts.
-Tool manufacturing: can be used to manufacture certain tool parts.
S45C steel (Japanese standard JIS G4051)
- Chemical composition:
-Carbon (C) : 0.42% ~ 0.50%
-Manganese (Mn) : 0.60% ~ 0.90
-Silicon (Si) : 0.20% ~ 0.40
-Phosphorus (P): ≤ 0.04
-Sulphur (S): ≤ 0.04
- Mechanical Properties (typical values)
-Tensile Strength (Rm): 570 - 790 MPa
-Yield strength (Rel): 335 - 480 MPa
-Elongation (A): ≥ 16% - Impact work (Akv): (at room temperature) typically over 30 J
- Characteristics:
-Good mechanical properties: similar to 45# steel, suitable for parts requiring a certain degree of strength and toughness.
-Good machinability: Mechanical properties can be further improved by appropriate heat treatment.
-Weldability: good weldability under proper preheating conditions.
- Application areas:
-Mechanical manufacturing: used to manufacture various mechanical parts, such as shafts, gears, connecting rods, etc.
-Automotive industry: used to manufacture automotive parts.
-Tool manufacturing: can be used to manufacture certain tool parts.
Comparison:
-Chemical composition: Although the main chemical composition of the two is similar, the manganese content of S45C is a bit higher, which may affect the mechanical properties and processing performance of the material.
-Standards: 45# steel conforms to the Chinese national standard GB/T 699, while S45C conforms to the Japanese Industrial Standard JIS G4051.
-Applications: Both can be used to make similar mechanical parts, but in specific applications the choice may be based on standards and availability.