What is S45C Steel?

S45C is a medium carbon steel grade that belongs to the Japanese Industrial Standards (JIS) G4051 standard. It is known for its good machinability, appropriate for a range of applications that require high strength, wear and tear resistance, and excellent toughness. And its versatility makes it a preferred material for industries that require optimal performance and durability.

What is the Purpose of utilizing CNC Turning & Milling to process S45C steel?

CNC turning and milling services are widely utilized in the machining of S45C material. CNC machines offer exceptional precision and efficiency, allowing for the production of complex geometries and tight tolerances. With CNC turning, the S45C workpiece is rotated while a cutting tool shapes it into the desired form. CNC milling, on the other hand, involves the removal of material using rotating cutting tools to create intricate features and contours.
And S45C steel in CNC machining is to leverage its advantageous properties to produce high-quality parts and components. It offers excellent machinability, enabling efficient material removal and shaping. CNC machining allows for precise and repeatable manufacturing, meeting the stringent requirements of various industries.

International Comparison of Materials

While there might be slight variations in chemical composition and heat treatment processes, these materials share similar mechanical properties and are suitable for CNC machining applications.

S45C Chemical Composition

Conditions of Heat Treatment


880℃ Furnace Cooling. Heating the steel to a specific temperature and then slowly cooling it to improve machinability and reduce internal stress.


880~870℃ Air Cooling. Heating the steel to a temperature above the critical range and then cooling it in still air to refine the grain structure and improve strength and toughness.


medium Water or Oil


550~650℃ Rapid Cooling. Rapidly cooling the steel from a high temperature and then reheating it to a specific temperature to obtain desired hardness and mechanical properties.

S45C Applications

S45C is widely used in mechanical parts and structural steel. It finds wide-ranging applications in CNC machining, including but not limited to:
Shafts and rollers
Gears and sprockets
Bolts,nuts, and fasteners
Machine components and tooling
Automotive parts
Construction machinery parts
S45C steel is a invaluable material for CNC machining, offering superior machinability, high strength, and excellent wear resistance. With the use of CNC turning and milling services, S45C steel can be shaped into precise and durable parts. It is a reliable choice for a wide range of applications across industries.