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Quench & Temper Spec Table
Quench & Temper KS Specifications — 8 sizes
KS D 3752KS D 3867KS D 3753KS D 3706KS D 3525
KSQuench & Temper
8 sizes| Material | Condition | Pre Hardness | Post Hardness | Case Depth | Application |
|---|---|---|---|---|---|
| S45C | 830~860°C → 550~650°C | HB 180~220 | HRC 45~52 | (20mm) | General MachineShaft··Gear ( Strength) |
| S50C | 820~850°C → 550~650°C | HB 190~230 | HRC 48~55 | (25mm) | High Strength Shaft··Pin |
| SCM435 | 830~870°C → 540~680°C | HB 200~240 | HRC 52~58 | (40mm) | Crank· |
| SCM440 | 830~870°C → 540~680°C | HB 210~250 | HRC 54~60 | (50mm) | High Strength Bolt·Shaft·Gear |
| SKD11 | 1000~1050°C → 150~200°C | HB 200~240 | HRC 58~62 | ForbiddenType· | |
| SKD61 | 1020~1080°C → 550~600°C ×2 | HB 200~235 | HRC 45~50 | · Forging ForbiddenType | |
| SUS440C | 1010~1065°C → 150~300°C | HB 250~290 | HRC 56~60 | Bearing·Blade·PrecisionShaft | |
| SUJ2 | 820~850°C → 150~200°C | HB 180~220 | HRC 60~64 | Bearing··Precision |
Quench & temper is the fundamental steel heat-treatment combination. The part is austenitized above Ac₃ (typically 820–880 °C), quenched to form martensite (HRC 55–65), then re-heated to 150–680 °C to restore toughness (final HRC 45–60). Typical applications: S45C for medium-strength shafts and gears, SCM440 for high-strength bolts and shafts, SKD11 for cold-work dies, SUJ2 for bearings. Key control points are hardenability (maximum through-hardening thickness) and avoidance of temper embrittlement (260–370 °C range).