Defnyddir dalen ddur Gradd 55 SA516 yn bennaf ar gyfer boeleri weldio tymheredd cymedrol ac is a llestri pwysedd eraill. Ym manyleb dur BS EN 10028-2, mae yna ddeunyddiau dur cyfatebol â phlât dur P265GH, plât dur P295GH a phlât dur P355GH.
Cyfansoddiad Cemegol Plât Dur ASTM A516:
| Gradd Dur | Uchafswm C ar gyfer Trwch t(mm) | Mn forthickness t(mm) | Si | P max | S max | ||||
|---|---|---|---|---|---|---|---|---|---|
| 6 Llai na neu hafal i t Llai na neu hafal i 12.5 | 12.5<> | 25<> | 50 |
t<12.5 | t>12.5 | ||||
| ASTM A516 Gradd 55 | 0.18 | 0.23 | 0.26 | 0.26 | 0.55-0.98 | 0.55-1.3 | 0.13-0.45 | 0.035 | 0.035 |
| ASTM A516 Gradd 60 | 0.21 | 0.23 | 0.23 | 0.25 | 0.60-0.90 | 0.85-1.20 | 0.13-0.45 | 0.035 | 0.035 |
| ASTM A516 Gradd 65 | 0.24 | 0.26 | 0.26 | 0.28 | 0.85-1.20 | 0.85-1.20 | 0.13-0.45 | 0.035 | 0.035 |
| ASTM A516 Gradd 70 | 0.27 | 0.28 | 0.28 | 0.30 | 0.85-1.20 | 0.85-1.20 | 0.13-0.45 | 0.035 | 0.035 |
Eiddo Mecanyddol Plât Dur ASTM A516:
| ASTM A516 | Cryfder Tynnol (MPa) | Isafswm cryfder cynnyrch (MPa) | Lleiafswm ehangiad (%) Mewn mesur o hyd: | |
|---|---|---|---|---|
| 50mm | 200mm | |||
| Gradd 55 | 380-515 | 205 | 23 | 27 |
| Gradd 60 | 415-550 | 220 | 25 | 21 |
| Gradd 65 | 450 | 240 | 23 | 19 |
| Gradd 70 | 485 | 260 | 21 | 17 |
Gradd dur Cyfwerth Plât Dur ASTM A516:
| ASME | ASTM | DIN 17155 | EN 10028 | BS1501 | |
|---|---|---|---|---|---|
| Gradd Dur | Gradd Dur | Enw | Rhif | ||
| SA516Gr60 | A516Gr60 | HII | P265GH | 1.0425 | 161 430A |
| SA516Gr65 | A516Gr65 | 17Mn4 | P295GH | 1.0481 | |
| SA516Gr70 | A516Gr70 | P355GH | 224-490 A & B | ||
