I need ti select beteween pipe astm 106 b vs plate a 516 gr 70 for 800 f superheater steam un steam boiler
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I need to be sure if in a Steam superheater boiler of 800 F can replace both headers material A 335 P11 with to alternative materials
ASTM 516 Gr 70 , rolling the plates, or a pipe A 106 B
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Selecting the appropriate material for the headers in a superheater steam boiler operating at 800°F (427°C) is crucial for safety and performance. Both ASTM A516 Grade 70 (A516 Gr 70) and ASTM A106 Grade B (A106 B) have their respective applications, and the choice depends on various factors:
ASTM A516 Grade 70 (A516 Gr 70):
ASTM A516 Gr 70 is a carbon steel plate material commonly used for pressure vessels and boilers. It’s known for its high strength and excellent weldability. However, it may not be the best choice for headers in a superheater operating at 800°F due to the following reasons:
Temperature Limitation: A516 Gr 70 is typically used in applications with lower temperatures. At 800°F, it may start to exhibit reduced strength and could potentially undergo creep deformation over time.
Oxidation: At high temperatures, carbon steel can be prone to oxidation, which can lead to corrosion and material degradation.
Considering these factors, A516 Gr 70 might not be the best choice for headers in a superheater operating at 800°F.
ASTM A106 Grade B (A106 B):
ASTM A106 Gr B is a seamless carbon steel pipe that is often used for high-temperature applications, including superheater headers. It’s designed for conveying high-temperature fluids and gases. Advantages of using A106 B include:
High-Temperature Strength: A106 B is specifically designed to handle high temperatures, making it a suitable choice for a superheater operating at 800°F.
Resistance to Oxidation: Carbon steel pipes like A106 B are better equipped to resist oxidation at elevated temperatures compared to carbon steel plates.
Considering the high operating temperature of 800°F in a superheater, ASTM A106 Grade B (A106 B) pipe would be the more suitable choice for the headers. However, it’s essential to consult with a materials engineer or specialist who can perform a detailed analysis of your specific boiler system’s requirements and conditions to ensure that the selected material meets all safety and performance criteria. Additionally, local regulations and industry standards must also be taken into account when making this decision.