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Carburizing Spec Table
Carburizing KS Specifications — 3 sizes
KS D 3867
KSCarburizing
3 sizes| Material | Condition | Pre Hardness | Post Hardness | Case Depth | Application |
|---|---|---|---|---|---|
| SCM420 | 930°C Carburizing → 830°C → 150°C | HB 150~180 | HRC 58~62 | 0.5~1.5mm | Gear··Shaft |
| SCM415 | 920°C Carburizing → 820°C → 150°C | HB 140~170 | HRC 58~62 | 0.4~1.2mm | Small Gear·Pin |
| SNCM420 | 930°C Carburizing → 830°C → 150°C | HB 170~200 | HRC 58~63 | 0.8~2.0mm | Large Gear· Shaft |
Carburizing diffuses carbon into the surface of low-carbon steels (SCM415/SCM420/SNCM420) to create a high-carbon (0.8–1.0 % C) layer, then quenches only the case. The tough low-carbon core is retained while the case reaches HRC 58–62 at 0.5–1.5 mm depth — ideal for gear teeth, splines, and cams that need both wear and impact resistance. Gas carburizing at 930 °C for several to tens of hours is mainstream; vacuum carburizing offers reduced distortion and more consistent quality.