Can high-strength bolts such as those of grade 10.9S be used on pressure vessels?
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For flange sealing in pressure vessels where there is a high pressure of 35 MPa and a high temperature of 300 degrees, I am considering using 10.9S grade high-strength bolts – is that suitable?
The high-pressure flange bolts on pressure vessels are of special-grade material; commercial-grade bolts are not used
Not every material can be used for studs in pressure vessels; only materials within specified ranges must be employed.
With such high pressure, it’s better to be cautious and use a dedicated cable.
If 35CrMoA is used to manufacture bolts that are quenched and tempered to achieve a strength grade of 10.9 or 12.9, can the allowable stress be calculated by dividing the value specified in the standards by a safety factor?
Bolts of grades 10.9 and 12.9 should not be within the permitted range for bolts used in pressure vessels.
This requires specialized-grade studs; just perform the calculations to ensure they meet the requirements.
I would like to ask how this allowable stress should be determined?