ASTM A269 nyaéta spésifikasi standar pikeun pipa baja tahan karat austenitik anu mulus sareng dilas pikeun jasa tahan korosi umum sareng suhu rendah atanapi luhur. ASTM A249 nyaéta spésifikasi standar pikeun boiler baja austenitik anu dilas, superheater, penukar panas, sareng tabung kondensor. ASTM A213 nyaéta spésifikasi standar pikeun boiler baja paduan feritik sareng austenitik anu mulus, superheater, sareng tabung penukar panas. Bédana antara A269, A249, sareng A213 aya dina standar khusus anu diwakilan pikeun pipa baja tahan karat.
STANDAR ASTMA249 ASTM A269 ASTMA270 ASTM213
| Standar | Toleransi Diaméter Luar (mm) | Kandel témbok（%) | Toleransi Panjang (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 | ||||
Waktos posting: 27 Juni 2023