Low Temperature Bolting Specs
Low Temperature Bolting Specs
(OP)
Our client spec calls for ASTM A320 Grade L7 Bolts for Low temperature service. We can readily purchase BS3692 Grade 8.8 Bolts.
Information on UTS, and YS is readily available but the temperature ratings are not.
Anyone out there have the temp ratings or any other significant differences between these two bolt grades? Thanks
Information on UTS, and YS is readily available but the temperature ratings are not.
Anyone out there have the temp ratings or any other significant differences between these two bolt grades? Thanks






RE: Low Temperature Bolting Specs
The best answer you can get is coming from your supplier, who would sell you the BS3692 bolts;- he is suppose the send you the material certificate and you are not suppose to accept the bolts without certification. On the certificate should be stated the impact properties of those bolts, including the test temperature and the impact values. If there is no certificate or no impact test on the certificate, the BS bolts are not equivalent to the L7 bolts. Give a ring to your supplier.
cheers,
gr2vessels
RE: Low Temperature Bolting Specs
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Low Temperature Bolting Specs
I haven't proposed it to the client yet as I cannot find the temperature rating for the Gr 8.8 Bolts.
The A320 L7's are Charpy tested to -195*F... I'd be happy with a -50*F rating , but still no luck on the temperature range for the 8.8's...
RE: Low Temperature Bolting Specs
Thanks in advance,
leftyeng
RE: Low Temperature Bolting Specs
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04