Gwiail crwn o ansawdd uchel
Gradd Dur | Defnydd | Caledwch Rockweell | Gweithredu Safon |
45 (SAE1045, S45C/S48C) | Ar gyfer Gradd 8.8 | HRC28-32 | GB/T 699 |
40Cr (SAE5140, SCr440) | Ar gyfer Gradd 10.9 | HRC32-39 | GB/T 3077 |
35CrMo (SAE4135, SCM432/SCRRM3) | Ar gyfer Gradd 12.9 | HRC39-42 | GB/T 3077 |
42CrMo (SAE4140, SCM440) | Ar gyfer Gradd 12.9 | HRC39-42 | GB/T 3077 |