JIS S35C Alloy Steel Bar S35C Round Bars S35C Rods

Product Description

JIS S35C is a high-quality medium-carbon steel defined under the Japanese Industrial Standard JIS G4051. It is a versatile "structural" steel, offering a higher strength profile than mild steel while maintaining excellent machinability and response to surface heat treatments.

1. Chemical Composition

The "35" in S35C represents the median carbon content of 0.35%. It is a non-alloy steel, meaning it relies on carbon and manganese for its properties rather than expensive alloying elements like chrome or nickel.

2. Mechanical Properties

S35C is typically used in the Normalized or Quenched and Tempered (+QT) state. It strikes a "sweet spot" between the softer S20C and the harder S45C.

3. Key Technical Characteristics

• Surface Hardening: S35C is frequently chosen for High-Frequency Induction Hardening. It can achieve a surface hardness of HRC 45–52, making it ideal for parts that need a hard exterior for wear resistance and a tough interior to absorb shock.

• Machinability: One of its strongest suits. S35C is highly favored for precision CNC machining of rods and bars as it produces predictable chips and an excellent surface finish.

• Weldability: Fair. While more weldable than S45C, it still requires preheating (approx. 150°C) for thicker sections to prevent cracking.

• Ductility: It is more ductile than S45C, making it less prone to brittle failure in cold climates or high-vibration environments.

4. Global Equivalents

If you are sourcing internationally or replacing an S35C part, these are the nearest standard matches:

5. Common Applications

JIS S35C round bars and rods are essential components in the automotive and machinery industries:

• Automotive: Steering knuckles, connecting rods, and small-diameter axles.

• Industrial Fasteners: High-strength bolts, studs, and heavy-duty nuts.

• General Engineering: Keyed shafts, spindles, drive shafts, and spacers.

• Agriculture: Pivot pins, bushings, and lever arms for farm equipment.

Available Stock Conditions

• Round Bars: Available in a massive range of diameters, from 5mm to 500mm.

• Rods/Wire: Often used in cold-heading applications for specialized fasteners.

• Finish: Cold Drawn (for tight tolerances), Peeled (to remove decarburization), or Hot Rolled (black).