1, Dur strwythurol carbon: 10, 15, 20, 25, 30, 35, 40, 45, 50,... 80
2, dur offer carbon: T7, T8, T9, T10... T13, t7mn, t8mn... T13mn, t7mna... T 13mna
Dur strwythurol aloi:
1. Manganîs dur: 20Mn2, 30Mn2, 35Mn2, 40Mn2, 45Mn2, 50mn2
2. dur vanadium manganîs: 20mnv, 42mnv
3. dur twngsten molybdenwm manganîs: 30mn2mow
4. Cromiwm dur: 15Cr, 20Cr, 30Cr, 40Cr, 45Cr, 50Cr
5. dur vanadium Chrome: 20crv, 40crv, 45crv
6. dur molybdenwm cromiwm: 20CrMo, 30CrMo, 35CrMo, 42CrMo
7. Chromium molybdenum aluminum steel: 38CrMoAl
8. Dur nicel cromiwm a dur molybdenwm nicel cromiwm: 20crni, 40crni, 45CrNi, 12crni2, 12crni3, 37CrNi3, 20cr2ni4, 40CrNiMo, 18Cr2Ni4WA
9. Cromiwm manganîs dur, cromiwm manganîs titaniwm dur, cromiwm manganîs molybdenwm dur:... 20CrMnTi
10. Dur silicon cromiwm, dur silicon cromiwm manganîs:11 ~ x, dur torri am ddim, dur daear prin, dur boron, dur gwanwyn, dur dwyn
