1. Material Composition and Manufacturing:
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ASTM A179: Low carbon steel, cold-drawn, known for good thermal conductivity and ductility. Ideal for low to medium temperature and pressure heat exchanger systems.
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ASTM A192: Medium carbon steel, often hot-rolled or cold-drawn, provides higher strength and is suitable for high-temperature and high-pressure applications.
2. Pressure and Temperature Adaptability:
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A179 tubes are typically used in condensers and heat exchangers where high thermal conductivity is required under lower pressure.
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A192 tubes are preferred for high-pressure boilers and superheaters due to their superior pressure resistance.
3. Thermal Conductivity Comparison:
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A179, with lower carbon and thinner walls, provides better heat transfer performance.
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A192 has thicker walls for higher pressure, but with slightly lower heat transfer efficiency.
4. Cost and Workability:
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A179 is easier to process, ideal for precise fin extrusion and mass production.
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A192 is slightly more expensive, but offers greater safety in high-stress conditions.
Selection Guide:
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For systems prioritizing heat transfer with moderate pressure: Choose ASTM A179.
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For high-pressure boiler or steam systems requiring greater strength: Choose ASTM A192.