ASTM A178 welded boiler tube is a resistance welded carbon steel and carbon manganese steel boiler and superheater tube. It is mainly used in the manufacture of boilers and superheaters. This kind of steel pipe has excellent high temperature resistance and mechanical properties, and can withstand high temperature and high pressure working environments. At the same time, its welding performance is also very good, which can ensure the sealing and safety of boilers and superheaters.
The production process of ASTM A178 welded boiler tubes requires multiple processes, including raw material selection, steel tube forming, welding, heat treatment, etc. During the production process, various process parameters need to be strictly controlled to ensure that the quality and performance of steel pipes meet standard requirements.
1)Materials
GradeA,GradeC,GradeD Bolier steel tube.
2)Size
OD 1/2in-5in(12.7-127mm)
3)Wall thickness
0.035in-0.360in(0.9-9.1mm)
4)Different name
Condenser steel tube,heat-exchanger tube,low carbon steel pipe,Resistance welded steel tube ,Bolier flues,Spoerheater flues and safe ends,ERW carbon steel pipes.
Chemical Composition:
| Element % | Grade A | Grade C | Grade D |
| Low carbon steel | Medium Carbon Steel | Manganess Steel | |
| C | 0.06-0.18 | 0.35 Max | 0.27 Max |
| Mn | 0.27-0.63 | 0.80 Max | 1.00-1.50 |
| P | 0.035 | 0.035 | 0.030 |
| S | 0.035 | 0.035 | 0.015 |
| Si | ... | ... | 0.10 Min. |
Mechanical Properties
| Grade A | Grade C | Grade D | |
| Tensile Strength Loading Ksi (Mpa) | ≥47 (325) | 60 (415) | 70 (485) |
| Yield Strength Loading Ksi (Mpa) | ≥26 (180) | 37 (255) | 40 (275) |
| Elongation (50mm) % | ≥35 | ≥30 | ≥30 |
