Seeking information on the supply status of Incoloy 800H, the material used for ASTM B407 heat exchanger tubes
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Regarding the supply condition of Incoloy 800H, the material used for heat exchange tubes per ASTM B407, has anyone experienced using this material for heat exchange tubes in pressure vessels? What is the typical supply condition in such cases? Urgent: I need to know the supply status, specifically the relevant design parameters at its designed temperature. Thank you.
For use in environments up to 500°C, Incoloy 800H is supplied in the annealed condition. Minimum mechanical properties of the alloy at room temperature: tensile strength 450, yield strength 180, ductility 35
What is the supply status of “heat finishing,” and when or under what circumstances is it used? Thank you.
“\"Finishing\" refers to the precise shaping of parts, which is divided into hot finishing and cold finishing； Heat finishing should involve heating the parts to a certain temperature in order to achieve precise shaping, thus meeting the shape tolerances specified in the drawings.
Oh, I see. For heat exchange tubes, cold-drawn tubes are generally required, so the ‘heat-finished’ condition of the tubes is obviously not suitable for use. So I have another question for you: When looking up the allowable stress for Incoloy 800H pipes in B407 at corresponding temperatures, there are two rows showing different stress values, and I couldn’t find any explanation for the difference between these two rows in the annotations. Referring to the provisions on allowable stresses in GB150.2-2011, is it the case that the value corresponding to the lower stress level is generally used in situations where micro-deformations that could lead to leakage are not allowed? Does deformation of heat exchange tubes resulting in leakage fall under such situations? Thank you.