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IS JIS G4051 S45C STEEL SUITABLE FOR MACHINE STRUCTURAL USE?

Table of Contents

What is S45C Steel?

S45C steel is a widely used engineering material known for its excellent mechanical properties and versatility. This post provides an in-depth look at the technical specifications and properties of S45C carbon steel, commonly used in machine structures.

1. S45C Steel and JIS G4051 Standard

S45C steel is categorized under the JIS G4051 standard, which specifies carbon steels for machine structural use. This standard covers heat-treatable steels, alloy steels, and free-cutting steels, ensuring that S45C meets the necessary requirements for various engineering applications.

 

2. Commonly Available Shapes of JIS S45C Steel

JIS S45C steel is a medium-strength material ideal for components such as shafts, studs, and keys. It is typically supplied in rolled or normalized conditions and is available in various forms, including square bars, round bars, and flat bars. This steel is known for its excellent weldability and machinability, making it suitable for various heat treatments.

 

3. Equivalent Grades of JIS S45C Steel

Several structural steel standards offer equivalent grades to JIS S45C

DIN C45, CK45, 1.1191

AISI 1045

EN-8 / BS 970-1955 080M40

 

4. Properties of JIS S45C Steel

Chemical Composition

Standard Grade C Mn P S Si
JIS G4051 S45C 0.42-0.48 0.60-0.90 0.03 0.035 0.15-0.35

Density: 7700-8030 kg/m³

Young’s Modulus: 190-210 GPa

Tensile Strength: 569 MPa (Standard), 686 MPa (Quenching, Tempering)

Yield Strength: 343 MPa (Standard), 490 MPa (Quenching, Tempering)

Poisson’s Ratio: 0.27-0.30

 

5. Hardness of JIS S45C Steel

Brinell Hardness: 160-220 HB (Annealed)

 

 

6. Heat Treatment of JIS S45C Steel

JIS S45C steel is suitable for various heat treatment processes

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

 

7. Applications of JIS S45C Steel

JIS S45C grade carbon steel is extensively used in machinery manufacturing due to its good mechanical properties. However, as a medium-carbon steel, its hardening performance is moderate, typically reaching HRC42 to 46. To achieve surface hardness while maintaining superior mechanical properties, surface carburizing is often employed. This process is common in applications such as motor shafts and automotive parts.

 

For any inquiries about JIS S45C steel or its equivalent grades, please feel free to reach out. We are a reliable supplier committed to providing high-quality S45C steel with a quality guarantee.

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