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ASTM designation for Super Duplex bolting?

ASTM designation for Super Duplex bolting?

ASTM designation for Super Duplex bolting?

Hi all

Is there an ASTM designation that deals with Super Duplex bolting?

For a particular service, our pipe spec calls for super duplex bolting on flanged connections, and refers correctly to UNS 32760; however it then refers to A790 which is seamless and welded pipe (obviously not correct as we are talking about bolts!)

I've noticed some websites associate UNS 32760 with A453, is this what we should be referring to?

I've attached the bolting information for this particular service.

Thanks in advance,
Dumbfounded Grad.

PS.  "note 7" referred to in the attachment is: "use machine bolts on lugged valves" - irrelevant in this case.

RE: ASTM designation for Super Duplex bolting?

I have found some assistance, and it appears super duplex bolting (Austenitic - Ferritic) UNS 32760 (Zeron 100) easily meets the tensile requirements for ASTM A193-B7 or ASTM A320. Thanks.

RE: ASTM designation for Super Duplex bolting?


Just to be clear, the answer to your first question is no, grade UNS S32760 does not appear in any ASTM fastener standards (ASTM A 320, A 193, A 453, etc.).

RE: ASTM designation for Super Duplex bolting?

Thanks to both of you, this is good information.


RE: ASTM designation for Super Duplex bolting?

The folks at TMR in Pittsburgh are working on some ASTM spec fro fasteners in duplex alloys.  Call Ralph Davidson and ask him for some guidance.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

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