Structural Bolt for High Temperature Lug Support

[Soft2008]

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

 

[XL83NL]

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ASTM A-325 has been withdrawn and replaced by ASTM F3125.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?

 

[mrfailure]

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

 

[MJCronin]

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

MJCronin
Sr. Process Engineer

 

[Soft2008]

Thank you,

@XL83NL
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.

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

@MJCronin
I am attaching the equipment picture with design details as requested

 

[MJCronin]

https://www.eng-tips.com/viewthread.cfm?qid=281398

https://www.eng-tips.com/viewthread.cfm?qid=279402

MJCronin
Sr. Process Engineer

 

[Soft2008]

@MJCronin,
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