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Machine Structural Carbon Steel Equivalent Chart
Machine Structural Carbon Steel KS Specifications — 6 sizes
KS D 3752
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.
KSMachine Structural Carbon Steel
6 sizes| KS | JIS | DIN | ANSI/ASTM | Category | Note |
|---|---|---|---|---|---|
| S10C | S10C | Ck10 | 1010 | Carbon Steel | Carburizing Low Carbon Steel |
| S20C | S20C | Ck22 | 1020 | Carbon Steel | Carburizing·Carbonitriding |
| S35C | S35C | Ck35 | 1035 | Carbon Steel | Shaft·Bolt·Gear |
| S45C | S45C | Ck45 | 1045 | Carbon Steel | Most General MachineStructural Steel |
| S50C | S50C | Ck50 | 1050 | Carbon Steel | Spring· |
| S55C | S55C | Ck55 | 1055 | Carbon Steel | High Strength Shaft·Gear |
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.