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Ups. Sorry. I misread kingnero post and missed word "against". Now idea of using A4 has gone. They are using weathering steel in this plant (costal area) for 15 years with good results. Have no argument against their experience.

Thank you. I will go for A4. What is interesting... Client says they used DIN 933 St8.8 in a previous projekts and nothing bad happened.

thanks for answering Isolating bolts is not predicted Temp changes of medium are 50-250 Celsius degrees, but not all the time. Duct can be empty for some time. It is outside, Norway - by the sea shore. Wet/dry alternately. If this is outside it can dry after rain, but I assume a bit of water...

Hi to all ;) Can you please advise what kind of fasteners (bolts) are applicable to weathering steel (corten, COR-TEN)? The case is we have some exhaust parts (stack, ducts) to be bolted together and I am aware of proper bolt type selection. I found that in US, bolt type A325 are designated to...