| Eitemau | C | Mn | Si | S | P |
| Gwerth Safonol | ≤0.12 | ≤1.50 | ≤0.80 | ≤0.030 | ≤0.030 |
| Achos Gwerth | 0.04 | 1.28 | 0.38 | 0.006 | 0.011 |
| Eitemau | Ni | Cr | Mo | V | |
| Gwerth Safonol | 0.8 – 1.10 | ≤0.15 | ≤0.35 | ≤0.05 | |
| Achos Gwerth | 0.90 | / | / | / |
| Eitemau | Cryfder Tynnol Rm/MPa | Cryfder Cynnyrch Rel/Rp0.2 MPa | Ymestyn A/% | Ynni effaith Charpy V-notch KV2(J)-30ºC/-40ºC |
| Gwerth Safonol | 490-620 | ≥400 | ≥20 | ≥27 |
| Achos Gwerth | 570 | 510 | 27 | 135/120 |
| Diamedr Gwifren (mm) | 1.0 | 1.2 | 1.4 | 1.6 | |
| Ystod Weldio (A) | Safle Platfform | 120 – 250 | 120 – 300 | 150 – 400 | 180 – 450 |
| Weldio Fertigol i Fyny | 120 – 210 | 120 – 260 | 150 – 270 | 180 – 280 | |
| Weldio Uwchben | 200 – 250 | 200 – 300 | 220 – 300 | 250 – 300 | |
| Weldio Llorweddol | 120 – 230 | 120 – 280 | 150 – 320 | 180 – 350 | |



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