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Induction Hardening Spec Table
Induction Hardening KS Specifications — 4 sizes
KS D 3752KS D 3867KS D 3525
KSInduction Hardening
4 sizes| Material | Condition | Pre Hardness | Post Hardness | Case Depth | Application |
|---|---|---|---|---|---|
| S45C | Surface 900~950°C → → 170~200°C | HB 200~240 | HRC 52~58 | 1.5~4mm | Shaft·· |
| S50C | Surface 900~950°C → → 170~200°C | HB 210~250 | HRC 55~60 | 1.5~4mm | Shaft·Pin |
| SCM440 | Surface 900~950°C → → 170~200°C | HRC 35~42 | HRC 55~60 | 2~6mm | Heavy Load Shaft·Gear |
| SUJ2 | Surface 830~880°C → → 150~180°C | HRC 60~62 | HRC 60~64 | 1.5~3mm |
Induction hardening uses induced surface currents to heat the workpiece above Ac₃ in seconds, followed by immediate water quenching to harden only the surface. It applies to mid-carbon steels with ≥ 0.35 % C (S45C, S50C, SCM440, SUJ2), yielding a 1.5–6 mm case at HRC 55–62. The short cycle (seconds to minutes) and localized nature make it ideal for selective hardening — journal sections, splines, linear-guide rails, cams — where only specific areas need to be hard.