Material selection for high-temperature and high-pressure vessels
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I have a small container with a DN500 size, designed for a pressure of 6 MPa and a temperature of 675°C; the medium used is high-temperature compressed air. The expected service life of this equipment is around 1 year. Initially, I chose 316 as the material to use, but I think its strength may not be sufficient at such high temperatures. Do any of you have any better recommendations? The budget needs to be taken into consideration, so the cost cannot be too high!
What equipment requires such high temperatures? S31608 can be considered, but the allowable stress at this temperature is already very low. If designed according to the rules, it will result in a very thick wall thickness for the cylinder; in such cases, it is recommended to consider analytical design instead. Additionally, there are some heat-resistant steel SA6** series in ASME – could those be considered? However, the cost is likely to be high, and the materials are not easy to obtain.
It’s just a small storage tank, used for experiments; so once the experiments are completed within a year, it might not be needed anymore.