Q: I’m looking for bolts/nuts material able to withstand to cycling temperature changes from 20 Celsius up to 600 Celsius. Strength is also important . Looking for something with tensile strength at least 800 Mpa. The application is diesel engine exhaust manifold.
Looking at your web site not sure Inconel is the right choice, but I’m not sure. Can you please advice.
A: You are probably better of with A286 material. A286 bolts (alloy 660) provide high strength temperature resistance to 1300°F (700°C). This alloy also will work well on an exhaust as they are known for their creep and oxidation resistance. Inconel bolts will also work but may be overkill.