ASTM A269 bụ ọkọlọtọ ọkọlọtọ maka enweghị nkebi na welded austenitic igwe anaghị agba nchara tubing maka izugbe corrosion-eguzogide na obere ma ọ bụ elu okpomọkụ. ASTM A213 bụ ọkọlọtọ nkọwapụta maka enweghị nkebi ferritic na austenitic alloy-steel ji esi mmiri ọkụ, superheater, na okpomọkụ-exchanger tubes. Ọdịiche dị n'etiti A269, A249, na A213 dabeere kpọmkwem ụkpụrụ ha na-anọchi anya maka igwe anaghị agba nchara tubing.
ọkọlọtọ ASTMA249 ASTM A269 ASTMA270 ASTM213
| Ọkọlọtọ | Nkwenye nke dayameta dị n'èzí (mm) | Ọkpụrụkpụ mgbidi (%) | Ogologo ndidi (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 | ||||
Oge nzipu: Jun-27-2023