I-ASTM A269 iyisimiso esijwayelekile samashubhu ensimbi engenamthungo neshiselwe i-austenitic yensimbi engagqwali evamile yamasevisi amelana nokugqwala kanye namazinga okushisa aphansi noma aphezulu. I-ASTM A213 iwukucaciswa okujwayelekile kwe-ferritic ne-austenitic alloy-steel boilers engenamthungo, i-superheater, namashubhu okushintsha ukushisa. Umehluko phakathi kwe-A269, A249, ne-A213 usemazingeni athile amele wona kumashubhu ensimbi engagqwali.
IZINGA LE-ASTMA249 ASTM A269 ASTMA270 ASTM213
| Okujwayelekile | Ukubekezelela Ububanzi Bangaphandle (mm) | Ukujiya kodonga (%) | Ukubekezelela Ubude(mm) | ||
| I-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 | ||||
| I-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 | ||||
| I-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 | ||||
| I-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 | ||||
Isikhathi sokuthumela: Jun-27-2023