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Structural Bolt for High Temperature Lug Support

Structural Bolt for High Temperature Lug Support

Structural Bolt for High Temperature Lug Support

As previous project experience, I have used "SA-307-B or SA-325 bolts" for supporting the equipment lug on the structure.

Now I have a high temperature heat exchanger with design 565 deg C (operating 530 deg C).
In such high temperature lug, Is SA-307-B is still acceptable or should I need to consider the stainless steel setting bolt material because of high temperature?

Thank you in advance

RE: Structural Bolt for High Temperature Lug Support

What actual temperature will they see? .. is what it probably depends on.

ASTM A-325 has been withdrawn and replaced by ASTM F3125.
Why do you need them to SA if theyre used on lugs?

RE: Structural Bolt for High Temperature Lug Support

Have you considered alloy steel bolts made to ASTM A193 such as Grade B16? That spec is for bolting used at elevated temperatures.

RE: Structural Bolt for High Temperature Lug Support

Give us a picture or drawing that shows the fasteners....

Sr. Process Engineer

RE: Structural Bolt for High Temperature Lug Support

Thank you,

Thanks for informing A-325 is replaced by ASTM F3125. SA is not mandatory for support bolts, so I would just go with ASTM grade.
Regarding your reply, I know the equipment design temp. But it was difficult to exactly determine the actual temperature at lug. So I was asked by client to be conservative and to use the maximum temperature 565 deg C.

ASTM A193 B16 can be a good option as you suggest for this high temp

I am attaching the equipment picture with design details as requested

RE: Structural Bolt for High Temperature Lug Support

The information on the linked threads is useful.Thank you.
I am contacting my vendor for the stainless steel bolt <<ASTM A 193 Grade B8>> for high temp

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