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Annealing Spec Table
Annealing KS Specifications — 3 sizes
KS D 3752KS D 3867KS D 3753
KSAnnealing
3 sizes| Material | Condition | Pre Hardness | Post Hardness | Case Depth | Application |
|---|---|---|---|---|---|
| S45C | 800~830°C → (0.5~1°C/min) | HB 200~240 | HB 170~200 | - | Groove· |
| SCM440 | 820~850°C → | HB 230~270 | HB 180~220 | - | Forging After |
| SKD11 | 830~880°C → (10~15°C/h) | HB 255~285 | HB 225 or less | - | ForbiddenType |
Annealing involves heating just above Ac₁ or Ac₃ and then slow-cooling in the furnace. Its main goals are improved machinability, stress relief, microstructural homogenization, and softening. Full annealing refines the microstructure of load-bearing parts; spheroidizing annealing prepares tool steels like SKD11 for machining. Cooling rate must be orders of magnitude slower than quenching (0.5–1 °C/min). Accidental rapid cooling raises hardness and makes subsequent machining difficult.