Understanding the Mechanical Properties of S45C Steel Plate

S45C steel plate, specified under JIS G 4051, is a high-quality medium carbon steel widely used in the manufacturing of mechanical parts that require high strength and good machinability. Understanding its mechanical properties is key to selecting the right material for industrial applications.

With a typical carbon content of 0.45%, S45C offers a balanced combination of strength, toughness, and hardness. In its normalized or annealed condition, it provides a tensile strength of around 570–700 MPa and yield strength of approximately 330 MPa. After quenching and tempering, its tensile strength can exceed 750 MPa, making it suitable for applications under heavy load and wear.

S45C also has good impact resistance and fatigue strength, which are essential for rotating parts such as shafts, gears, bolts, and pins. In terms of machinability, it performs well in turning, drilling, and milling operations, especially when heat-treated properly.

However, it’s important to note that S45C has limited weldability due to its higher carbon content. Pre-heating and post-weld heat treatment are often required to avoid cracking.

S45C steel plate delivers a reliable blend of strength and machinability, making it a popular choice for high-performance mechanical parts. Its mechanical properties can be further enhanced through heat treatment, offering flexibility for a wide range of engineering needs.