Differences Between S45C Steel and C45 Steel
S45C Steel
S45C is a medium-strength carbon steel, widely used in the manufacturing of shafts, studs, keys, and various mechanical components. This material, governed by the JIS G 4051-2009 standard, offers excellent machinability and weldability, making it a popular choice in industrial applications. S45C is available in various forms such as square bars, round bars, and flat bars, and can undergo multiple heat treatment processes to enhance its mechanical properties.
Mechanical Properties of S45C
Density: 7700-8030 kg/m³
Young’s Modulus: 190-210 GPa
Tensile Strength:
569 MPa (Standard)
686 MPa (After Quenching and Tempering)
Yield Strength:
343 MPa (Standard)
490 MPa (After Quenching and Tempering)
Poisson’s Ratio: 0.27-0.30
Brinell Hardness: 160-220 HB (Annealed)
S45C Equivalent Grades:
DIN Equivalents: C45, CK45, CF45, CQ45
ASTM Equivalents: ASTM A29, ASTM A510, ASTM A519, ASTM A576, ASTM A682
SAE Equivalents: SAE J403, SAE J412, SAE J414
AISI Equivalents: AISI 1045, AISI 1046
EN Equivalents: EN-8 / BS 970 080M40
Chemical Composition of S45C:
Carbon (C): 0.42% – 0.48%
Silicon (Si): 0.15% – 0.35%
Manganese (Mn): 0.6% – 0.9%
Phosphorus (P): 0.030% Max
Sulfur (S): 0.035% Max
Heat Treatment of S45C:
Full Annealing: 800 – 850°C
Normalizing: 840 – 880°C
Hardening: 820 – 860°C
Quenching Medium: Water or Oil
Tempering: 550 – 660°C
Melting Point: ~1520°C
C45 Steel
C45 is a medium carbon steel, non-alloy in nature, and is preferred when greater strength and hardness are required in applications where the material is typically used in its “as rolled” condition. Known for its extreme size accuracy, straightness, and concentricity, C45 steel minimizes wear in high-speed operations, making it ideal for precision components.
Chemical Composition of C45
Carbon (C): 0.43-0.50%
Silicon (Si): 0.17-0.4%
Manganese (Mn): 0.50-0.8%
Nickel (Ni): Trace elements
Heat Treatment of C45:
Soft Annealing: Heat to 680-710°C, followed by slow cooling in the furnace to achieve a maximum Brinell hardness of 207.
Normalizing: 840-880°C, followed by air cooling.
Hardening: 820-860°C, with subsequent quenching in water or oil.
Tempering: 550-660°C, followed by air cooling.
EASTAI HYDRAULIC is a professional manufacturer specializing in S45C and C45 tubes and rods, including honed tubes, pre-honed tubes, chrome bars, chrome-plated rods, and hollow chrome shafts. With over 20 years of experience in the industry, EASTAI HYDRAULIC ensures top-quality products for various engineering applications. For inquiries, feel free to contact us.
Chemical composition of1045 carbon steel balls(S45C) | |
C | 0.42%–0.48% |
si | 0.15%–0.35% |
Mn | 0.60%–0.90% |
P | 0.030%max. |
S | 0.035%max. |