ASTM A249 Priodweddau mecanyddol
O ran priodweddau mecanyddolTiwbiau ASTM A249, mae'r safon yn amlinellu gofynion penodol ar gyfer cryfder tynnol a chaledwch. Mae gofynion tynnol a chaledwch oTiwbiau weldio ASTM A249yn hanfodol i sicrhau eu perfformiad a'u dibynadwyedd. Rhaid i weithgynhyrchwyr a defnyddwyr y tiwbiau hyn sicrhau eu bod yn bodloni'r gofynion penodol a amlinellir yn y safon i warantu eu haddasrwydd i'w defnyddio mewn cymwysiadau boeler, uwch-wresogydd, cyfnewidydd gwres neu gyddwysydd.
Gofynion Cryfder Tynnol
Mae cryfder tynnol yTiwb dur di-staen ASTM A249yn fesur o'r straen mwyaf y gall y tiwb ei wrthsefyll cyn iddo ddechrau dadffurfio neu fethu. Yn ôl y safon, rhaid i'r tiwbiau fodloni'r gofynion cryfder tynnol lleiaf yn seiliedig ar eu graddau priodol.
Gofynion Caledwch
Ar y llaw arall, diffinnir caledwch fel mesur o ba mor wrthiannol aDeunydd ASME SA249yw anffurfiad lleol, yn enwedig anffurfiad plastig neu fewnoliad. Mae'r safon yn amlinellu dau fath o brawf caledwch y gellir eu cynnal ar y tiwbiau - prawf caledwch Rockwell a phrawf caledwch Brinell.
Gofynion Tynnol a ChaledwchA
| Gradd | UNS Dynodiad |
Cryfder Tynnol min,ksi [MPa] |
Isafswm Cryfder Cynnyrch,ksi [MPa] | Elongation mewn 2 modfedd neu 50 mm min, % | Caledwch Rockwell Nifer uchafswm |
| TP201 | S20100 | 95 [655] | 38 [260] | 35 | B95 |
| TP202 | S20200 | 90 [620 | 38 [260] | 35 | B95 |
| TPXM-19 | S20910 | 100 [690] | 55 [380] | 35 | C25 |
| TPXM-29 | S24000 | 100 [690] | 55 [380] | 35 | B100 |
| ... | S24565 | 115 [795] | 60 [415] | 35 | B100 |
| TP304 | S30400 | 75 [515] | 30 [205] | 35 | B90 |
| TP304L | S30403 | 70 [485] | 25 [170] | 35 | B90 |
| TP304H | S30409 | 75 [515] | 30 [205] | 35 | B90 |
| ... | S30415 | 87 [600 | 42 [290] | 35 | B96 |
| TP304N | S30451 | 80 [550] | 35 [240] | 35 | B90 |
| TP304LN | S30453 | 75 [515] | 30 [205] | 35 | B90 |
| TP305 | S30500 | 75 [515] | 30 [205] | 35 | B90 |
| ... | S30615 | 90 [620] | 40 [275] | 35 | B95 |
| ... | S30815 | 87 [600] | 45 [310] | 35 | B95 |
| TP309S | S30908 | 75 [515] | 30 [205] | 35 | B90 |
| TP309H | S30909 | 75 [515] | 30 [205] | 35 | B90 |
| TP309Cb | S30940 | 75 [515] | 30 [205] | 35 | B90 |
| TP309HCb | S30941 | 75 [515] | 30 [205] | 35 | B90 |
| TP310S | S31008 | 75 [515 | 30 [205] | 35 | B90 |
| TP310H | S31009 | 75 [515] | 30 [205] | 35 | B90 |
| TP310Cb | S31040 | 75 [515] | 30 [205 | 35 | B90 |
| TP310HCb | S31041 | 75 [515] | 30 [205] | 35 | B90 |
| ... | S31050: | ||||
| t Llai na neu'n hafal i 0.25 mewn. | 84 [580] | 39 [270] | 25 | B95 | |
| t>0.25 i mewn. | 78 [540] | 37 [255] | 25 | B95 | |
| ... | S31254: | ||||
| t Llai na neu'n hafal i 0.187 mewn. | 98 [675] | 45 [310] | 35 | B100 | |
| [5.00} mm] | |||||
| t>0.187 i mewn | 95 [655] | 45 [300] | 35 | B100 | |
| [5.00} mm] | |||||
| TP316 | S31600 | 75[515] | 30 [205] | 35 | B90 |
| TP316L | S31603 | 70 [485] | 25 [170] | 35 | B90 |
| TP316H | S31609 | 75 [515] | 30 [205] | 35 | B90 |
| TP316N | S31651 | 80 [550] | 35 [240] | 35 | B90 |
| TP316LN | S31653 | 75 [515] | 30 [205] | 35 | B90 |
| TP317 | S31700 | 75 [515] | 30 [205] | 35 | B90 |
| TP317L | S31703 | 75 [515] | 30 [205] | 35 | B90 |
| ... | S31725 | 75 [515] | 30 [205] | 35 | B90 |
| ... | S31726 | 80 [550] | 35 [240] | 35 | B90 |
| ... | S32050 | 98 [675] | 48 [330] | 40 | |
| TP321 | S32100 | 75 [515] | 30 [205] | 35 | B90 |
| TP321H | S32109 | 75 [515] | 30 [205] | 35 | B90 |
| ... | S32654 | 109 [750] | 62 [430] | 35 | B100 |
| ... | S33228 | 73 [500] | 27 [185] | 30 | B90 |
| TP347 | S34700 | 75[515 | 30 [205] | 35 | B90 |
| TP347H | S34709 | 75 [515] | 30 [205] | 35 | B90 |
| TP348 | S34800 | 75 [515] | 30 [205] | 35 | B90 |
| TP348H | S34809 | 75 [515] | 30 [205] | 35 | B90 |
| ... | S35045 | 70 [485] | 25 [170] | 35 | B90 |
| TPXM-15 | S38100 | 75 [515] | 30 [205] | 35 | B90 |
| ... | S38815 | 78 [540] | 37 [255] | 30 | B100 |
| ... | N08367 | ||||
| t Llai na neu'n hafal i 0.187 | 100 [690] | 45 [310] | 30 | 100 | |
| t>0.187 | 95 [655] | 45 [310] | 30 | 100 | |
| ... | N08904 | 71 [490] | 31 [215] | 35 | B90 |
| ... | N08926 | 94 [650] | 43 [295] | 35 | B100 |
Nodiadau:
A. Ddim yn berthnasol i diwbiau llai na 1⁄8 modfedd [3.2 mm] mewn diamedr allanol neu sydd â thrwch wal yn is na 0.015 modfedd [0.4 mm], neu'r ddau. Bydd priodweddau tynnol tiwbiau mor fach â diamedr neu waliau tenau yn fater o gytundeb rhwng y gwneuthurwr a'r prynwr.
