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Structural Bolt for High Temperature Lug Support

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Soft2008

Soft2008

Mechanical
Joined
May 4, 2009
Messages
16
Location
IN
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

 
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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ASTM A-325 has been withdrawn and replaced by ASTM F3125.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?
 
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Have you considered alloy steel bolts made to ASTM A193 such as Grade B16? That spec is for bolting used at elevated temperatures.
 
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Give us a picture or drawing that shows the fasteners....

MJCronin
Sr. Process Engineer
 
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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

 
 https://files.engineering.com/getfile.aspx?folder=09a0b042-1df8-492d-8ada-0c75d108c40b&file=Electric_Heater___Fasteners.png
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@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

 
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