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Machine Structural Carbon Steel Spec Table
Machine Structural Carbon Steel KS Specifications — 3 sizes
KS D 3752
KSMachine Structural Carbon Steel
3 sizes| Name | Type | Tensile | Yield | Hardness | Use |
|---|---|---|---|---|---|
| S45C | Carbon Steel | 570~750 | ≥330 | HB170~220 | Shaft, Gear, Bolt, CrankShaft, ForbiddenType |
| SM45C | Carbon Steel | 570~750 | ≥330 | HB170~220 | Shaft, Gear, , Coupling |
| S20C | Carbon Steel | 400~510 | ≥245 | HB120~150 | Bolt, , Pin, CarburizingParts |
S45C (KS/JIS) = Ck45 (DIN) = 1045 (ANSI): equivalent carbon machine structural steels. Most widely used for shafts, gears, and bolts.
Practical Notes
- S45C hardness adjustable HRC 20–55 via quenching and tempering. Specify heat treatment conditions (temperature, time) on drawings.
- S45C has poor weldability. For welding, use SM490 or SS400, or preheat before welding.
Key Features
- S45C is shared KS/JIS designation, equivalent to DIN Ck45 and ANSI 1045; the most versatile machine structural steel
- Classified S10C–S55C by carbon content (0.42–0.48%); higher carbon means higher strength and lower machinability
- Quenching and tempering (QT) achieves tensile strength of 700–900 MPa
Key Applications
Shafts, gears, bolts, crankshafts, couplings, mold bases
FAQ
S45C hardness after heat treatment?
Quench (850°C oil)→HRC 50–55. Adjusted by tempering: 200°C→HRC 50, 400°C→HRC 40, 600°C→HRC 25. Set tempering temperature by required hardness.