SNCM220 CASE HARDENING STEEL-JIS G4103
SNCM220 Case Hardening steel manufacturers and suppliers, supplied in round rods,square/flat bars,rollers,shafts,blocks and forging pieces.
SNCM220 Case Hardening Steel is defined as low Cr-Ni-Mo alloy steel as per JIS G4103 Standard.It has high surface hardness, good wear resistance and fatigue strength after nitriding heat treatment.SNCM220 is mainly used for automobile bearings, drive shafts, gears, screws, cutting tools and other products which need impact resistance and wear resistant.
1.Chemical Composition
| Grade | C | Si | Mn | P | S | Cr | Ni | Mo |
| SNCM220 | 0.17-0.23 | 0.15-0.35 | 0.6-0.9 | ≤ 0.03 | ≤ 0.03 | 0.4-0.65 | 0.4-0.7 | 0.15-0.30 |
2.Related Specifications
ASTM:8620
BS:805M20
EN/DIN:20NiCrMo2-2/21NiCrMo2
GB:20CrNiMo
3.Heat Treatment & Mechanical Property
SNCM220 Normalizing Diagram
SNCM220 Steel Normalizing Details
1.Normalize temperature:850-900℃
2.Three steps of temperature raising for evenly heating.
3.suitable holding time depends on the dimension.
4.Air cooling.
SNCM220 Annealing Diagram
SNCM220 Steel Annealing Details
1.Annealing temperature:830-870℃
2.Enough time for temperature holding
3.Cooling in the furnace.
4.Max hardness:200HB
SNCM220 Mechanical Property -Normalizing(+N) Vs Annealing(+A)
| Tensile,Mpa | Yield,Mpa | Elongation,% | Reduction,% | Charpy Impact, J | Brinell Hardness,HB | |
| +N | ≥635 | ≥355 | ≥26.3 | ≥60 | ≥100 | 183 |
| +A | ≥535 | ≥385 | ≥31.3 | ≥62 | ≥112 | 149 |
4.Supply Form & Size
- Round Bars: Dia.80 – 1,000mm as Forged
- Flat / Square Bars: Thickness Max.800mm
- Shafts, Rollers, Blocks: Customized or According to Drawing
- Rolled Round Bars: Dia.16 – 130mm with UT Assurance
Heat treatment:Quenched and Tempered (+QT), Normalizing (+N), Annealing (+A)
Surface finish:Black / Rough turned / Peeled