ASTM A178 Grade A, Grade C, Grade D Welded Steel Tube ERW Carbon-Manganese Steel Tube for Boiler and Superheater
Material
ASTM A178 is a specification for electric-resistance-welded (ERW) carbon-manganese steel tubes. These tubes are primarily used in the manufacturing of boiler and superheater components. The material is designed to withstand high temperatures and pressures, making it suitable for various industrial applications.
Specification
The ASTM A178 specification covers two grades of welded steel tubes: Grade A, Grade C, and Grade D. Each grade has specific requirements regarding mechanical properties and chemical composition.
Key Features
- High Strength: Designed to withstand high pressure and temperature.
- Weldability: Excellent weldability due to the carbon-manganese composition.
- Corrosion Resistance: Suitable for use in environments where corrosion is a concern.
- Versatility: Applicable in various industries, including power generation and manufacturing.
Chemical Composition
| Element | Grade A (%) | Grade C (%) | Grade D (%) |
| Carbon (C) | 0.06 - 0.18 | 0.06 - 0.18 | 0.06 - 0.18 |
| Manganese (Mn) | 0.30 - 0.90 | 0.30 - 0.90 | 0.30 - 0.90 |
| Phosphorus (P) | ≤ 0.035 | ≤ 0.035 | ≤ 0.035 |
| Sulfur (S) | ≤ 0.025 | ≤ 0.025 | ≤ 0.025 |
| Silicon (Si) | ≤ 0.40 | ≤ 0.40 | ≤ 0.40 |
Mechanical Properties
| Property | Grade A | Grade C | Grade D |
| Yield Strength (ksi) | 30 min | 35 min | 40 min |
| Tensile Strength (ksi) | 48 min | 50 min | 55 min |
| Elongation (%) | 30 min | 25 min | 20 min |
| Hardness (Rockwell B) | 80 max | 80 max | 80 max |
Steel Grade
- Grade A: Suitable for low-pressure applications.
- Grade C: Designed for moderate pressure applications.
- Grade D: Intended for high-pressure applications.
Application
ASTM A178 welded steel tubes are primarily used in:
- Boiler components
- Superheaters
- Heat exchangers
- Other high-temperature applications in power plants and industrial processes.
Possible Alternative Grades
- ASTM A53: A general-purpose steel pipe with similar applications.
- ASTM A106: Seamless carbon steel pipe for high-temperature service.
- ASTM A192: Seamless carbon steel boiler tubes for high-pressure applications.
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