| Nickel Chromium Molybdenum Alloy Steels for Machine Structure | JIS G4103-1979 | ||||||||||
| SAE Mark |
JIS Mark |
Chemical Composition (%) | Uses | ||||||||
| C | Mn | P | S | Si | Ni | Cr | Mo | V | |||
| 8620 |
SNCM 220 |
0.18~0.23 | 0.70~0.90 | 0.03 max |
0.04 max |
0.15~0.35 | 0.40~0.70 | 0.40~0.60 | 0.15~0.25 |
- | For shafts, pistons, vehicle parts with carburizing hardening surfaces |
| 8660 +V |
- | 0.56~0.64 | 0.75~1.00 | 0.035 max |
0.04 max |
0.15~0.35 | 0.40~0.70 | 0.40~0.60 | 0.15~0.25 |
0.15~0.25 |
Hand tools |
| 4320 | SNCM 420 |
0.17~0.23 | 0.40~0.70 | 0.03 max |
0.03 max |
0.15~0.35 | 1.60~2.00 | 0.40~0.60 | 0.15~0.30 | - | Shaft, car & motor parts |
| 4340 | SNCM 439 |
0.36~0.43 | 0.60~0.90 | 0.03 max |
0.03 max |
0.15~0.35 | 1.60~2.00 | 0.60~1.00 | 0.15~0.30 | - | |