Mae ASTM A269 yn fanyleb safonol ar gyfer tiwbiau dur gwrthstaen austenitig di-dor a weldio ar gyfer gwasanaethau sy'n gwrthsefyll cyrydiad cyffredinol a thymheredd isel neu uchel. Mae ASTM A213 yn fanyleb safonol ar gyfer boeler dur aloi ferritig ac austenitig di-dor, uwch-wresogydd, a thiwbiau exchanger gwres. Mae'r gwahaniaethau rhwng A269, A249, ac A213 yn gorwedd yn y safonau penodol y maent yn eu cynrychioli ar gyfer tiwbiau dur gwrthstaen.
ASTMA249 Safonol ASTM A269 ASTMA270 ASTM213
| Safonol | Goddefgarwch y diamedr allanol (mm) | Trwch wal （%） | Goddefgarwch hyd (mm) | ||
| ASTM A249 | <25.0 | +0.10 -0.11 | ± 10% | ||
| ≥25.0-≤40.0 | ± 0.15 | ||||
| > 40.0- <50.0 | ± 0.20 | Od <50.8 | +3.0-0.0 | ||
| ≥50.0 ~ <65.0 | ± 0.25 | ||||
| ≥65.0- <75.0 | ± 0.30 | ||||
| ≥75.0 ~ <100.0 | ± 0.38 | OD≥50.8 | +5.0-0.0 | ||
| ≥100 ~ ≤200.0 | +0.38 -0.64 | ||||
| > 200.0-≤225.0 | +0.38 -1.14 | ||||
| ASTM A269 | <38.1 | ± 0.13 | |||
| ≥38.1 ~ <88.9 | ± 0.25 | ||||
| ≥88.9- <139.7 | ± 0.38 | ± 15.0% | OD <38.1 | +3.2-0.0 | |
| ≥139.7 ~ <203.2 | ± 0.76 | ± 10.0% | 0d ≥38.1 | +4.0-0.0 | |
| ≥203.2- <304.8 | ± 1.01 | ||||
| ≥304.8- <355.6 | ± 1.26 | ||||
| Astma270 | ≤25.4 | ± 0.13 | ± 10% | +10-0.0 | |
| > 25.4-≤50.8 | ± 0.20 | ||||
| > 50.8 ~ ≤62 | ± 0.25 | ||||
| > 76.2- ≤101.6 | ± 0.38 | ||||
| > 101.6 ~ <139.7 | ± 0.38 | ||||
| ≥139.7–203.2 | ± 0.76 | ||||
| ≥203 2 ~ ≤304.8 | ± 1.27 | ||||
| ASTM213 | D ＜ 25.4 | ± 0.10 | +20/0 | +3.0/0 | |
| 25.4 ~ 38.1 | ± 0.15 | ||||
| 38.1 ~ 50.8 | ± 0.20 | ||||
| 50.8 ~ 63.5 | ± 0.25 | +22/0 | +5.0/0 | ||
| 63.5 ~ 76.2 | ± 0.30 | ||||
| 76.2 ~ 101.6 | ± 0.38 | ||||
| 101.6 ~ 190.5 | +0.38/-0.64 | ||||
| 190.5 ~ 228.6 | +0.38/-1.14 | ||||
Amser Post: Mehefin-27-2023