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ASTM A178 specifies electric-resistance-welded (ERW) carbon steel and carbon-manganese steel tubes intended for boiler, superheater, and heat-exchanger applications. These tubes are designed to withstand high-pressure and high-temperature conditions in power generation and industrial heating systems.
Grade A: Carbon steel (low carbon content, good formability)
Grade C: Carbon-manganese steel (higher strength and toughness)
Grade D: Carbon-molybdenum steel (improved creep resistance at higher temperatures)
| Standard | ASTM A178 / ASME SA178 |
| Grades | Grade A Grade C Grade D |
| Manufacturing Process | Electric Resistance Welded (ERW) |
| Surface Finish | Oiled, black painted, pickled, or galvanized |
| Outer Diameter | 6 mm – 114 mm (customized) |
| Wall Thickness | 1 mm – 12 mm |
| Length | 5 – 12 m (or as required) |
| Ends | Plain end, beveled end, or threaded/coupled |
Manufactured by ERW process for consistent wall thickness and weld integrity
Excellent strength-to-cost ratio for boiler applications
Withstands high pressure and temperature fluctuations
Grades tailored for different service conditions:
Grade A → standard boiler applications
Grade C → higher strength needs
Grade D → elevated temperature performance
Available in custom dimensions to meet design requirements
| Grade |
Carbon (C)
|
Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Molybdenum (Mo) |
| Grade A | 0.06–0.18 | 0.27–0.63 | 0.035 max | 0.035 max | — |
| Grade C | 0.35 max | 0.29–1.06 | 0.035 max | 0.035 max | — |
| Grade D | 0.27–0.36 | 0.93–1.20 | 0.030 max | 0.030 max | 0.44–0.65 |
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB) |
| Grade A | 325 min | 180 min | 35 min | 72 max |
| Grade C | 485 min | 275 min | 30 min | 89 max |
| Grade D | 515 min | 305 min | 30 min | 89 max |
ASTM A178 Grade A → Carbon Steel
ASTM A178 Grade C → Carbon-Manganese Steel
ASTM A178 Grade D → Carbon-Molybdenum Steel
Boiler tubes for steam generation
Superheater tubes for power plants
Heat exchanger tubes in refineries and chemical plants
Industrial furnace and heater tubes
Pressure piping systems in thermal power stations
ASTM A192 – High-pressure seamless carbon steel boiler tube
ASTM A210 – Medium-carbon seamless boiler tube
ASTM A213 T11/T22 – Alloy steel seamless tubes for high temperature
EN 10216-2 P235GH / P265GH – European boiler steels
DIN 17175 St35.8 / St45.8 – German boiler tube steels
A: manufacturer,also can do trading.
A: Generally speaking,it is 10-15 days if the goods are in stock,or it is 30-40 days if the goods are not in stock, it is according to quantity.
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.
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Main Product:
Seamless Steel Tubes,
Welded Precision Steel Pipes,
Automotive Steel Tubes,
Carbon steel tubes,
Stainless Steel Tubes,
Special Shaped Steel Tubes
