Production process of carbon steel welded pipe
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ASTM A178 Grade A Grade C Grade D Electric Resistance Welded Pipe For Boiler
Material
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.
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Grade A: Carbon steel (low carbon content, good formability)
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Grade C: Carbon-manganese steel (higher strength and toughness)
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Grade D: Carbon-molybdenum steel (improved creep resistance at higher temperatures)
Specification
| 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 |
Key Features
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Manufactured by ERW process for consistent wall thickness and weld integrity
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Excellent strength-to-cost ratio for boiler applications
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Withstands high pressure and temperature fluctuations
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Grades tailored for different service conditions:
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Grade A → standard boiler applications
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Grade C → higher strength needs
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Grade D → elevated temperature performance
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Available in custom dimensions to meet design requirements
Chemical Composition
| 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 |
Mechanical Properties
| 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 |
Steel Grade
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ASTM A178 Grade A → Carbon Steel
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ASTM A178 Grade C → Carbon-Manganese Steel
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ASTM A178 Grade D → Carbon-Molybdenum Steel
Application
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Boiler tubes for steam generation
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Superheater tubes for power plants
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Heat exchanger tubes in refineries and chemical plants
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Industrial furnace and heater tubes
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Pressure piping systems in thermal power stations
Possible Alternative Grades
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ASTM A192 – High-pressure seamless carbon steel boiler tube
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ASTM A210 – Medium-carbon seamless boiler tube
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ASTM A213 T11/T22 – Alloy steel seamless tubes for high temperature
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EN 10216-2 P235GH / P265GH – European boiler steels
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DIN 17175 St35.8 / St45.8 – German boiler tube steels
Q: Are you trading company or manufacturer ?
A: manufacturer,also can do trading.
Q: How long is your delivery time?
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.
Q: Do you provide samples? is it free or extra ?
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
Q: What is your terms of payment ?
A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.
If you have another question, pls feel free to contact with me.
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Automotive Steel Tubes,
Carbon steel tubes,
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