BOILER PIPE
Boiler tubes is a one of seamless pipe. Manufacturing methods is the same as seamless tube, but it has the stringent requirements for manufacture of steel pipes.
ASTM A179 (SA 179) standard specification covers seamless cold drawn low carbon steel pipe, for tubular heat exchanger, condensers and other similar heat transfer equipment.
The ASTM A179 tube covers the OD from 1/8” to 3”, which is 3.2m m to 76.2 mm. Other diameters and thickness smaller than the specified sizes also applicable to this standard, but mechanical properties is not applicable for the size smaller than 1/8” and 3.2 mm, or thickness smaller than 0.015 inch 0.4 mm.
| Grade | ASTM A179 / ASME SA179 | |
| min | max | |
| C | 0.06 | 0.18 |
| Mn | 0.27 | 0.63 |
| Si | – | 0.25 |
| P | – | 0.035 |
| S | – | 0.035 |
| Grade | ASTM A179 / ASME SA179 | |
| Tensile Strength (MPa) min | 325 | |
| Yield Strength 0.2% Proof (MPa) min | 180 | |
| Elongation (% in 50mm) min | 35 | |
| Hardness | Rockwell B (HR B) max | 72 |
| Brinell (HB) max | – | |
| Grade | ASTM A179 / ASME SA179 | |
| UNS No | K01200 | |
| Old British | BS | CFS 320 |
| German | No | 1629 / 17175 |
| Number | 1.0309 / 1.0305 | |
| Belgian | 629 | |
| Japanese JIS | D3563 / G3461 | |
| French | A49-215 | |
| Italian | 5462 | |
a179 Seamless Tubes outside diameter dimension and tolerance
| Outside Diameter, mm | Tolerance, mm |
| 3.2≤OD＜25.4 | ±0.10 |
| 25.4≤OD≤38.1 | ±0.15 |
| 38.1＜OD＜50.8 | ±0.20 |
| 50.8≤OD＜63.5 | ±0.25 |
| 63.5≤OD＜76.2 | ±0.30 |
| 76.2 | ±0.38 |
a179 Seamless Tubes wall thickess and tolerance
| Outside Diamter, mm | Tolerance, % |
| 3.2≤OD＜38.1 | +20/-0 |
| 38.1≤OD≤76.2 | +22/-0 |
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