Gents,
Good morning,
Can anybody exaplain in details, solution annealing?
Thanks and regards.
John
On Sat, 31 Jul 2010 08:02:54 +0530 wrote
>
Mr
Hegde,
Inconel 690 (UNS N06690) is an
all austenitic alloy which is covered under Sec-II Part-B,SB-163. Krupp
Nicrofer 6030 is the product of Thyssen Krupp
VDM,one of the key
players for this type of alloy products. Although being austenitic,Inconel 690alloy have fairly high
UTS and could work harden considerably while cold bending. Hence
manufacturer recommends post forming heat treatment as
follows:-
Cold
working:- For
cold working the material should be in the annealed condition. Nicrofer 6030 has
a higher work-hardening rate than austenitic stainless steels. This
should be taken into account when selecting forming equipment. Interstage
(Intermediate) annealing may be necessary with high degrees of cold forming.
After cold working with more than 10% deformation
soft or solution annealing is required before use.
Soft annealing of
Nicrofer 6030 should
be carried out in the temperature range 1020 to 1070 °C (1870 to 1960 °F),
preferably at about 1040 °C (1900 °F).
Solution
annealing for improved creep strength is carried out at 1080 to 1150 °C (1980 to
2100 °F). Water quenching or rapid air cooling is recommended for thicknesses
above about 1.5 mm (0.06 in.) and is essential for maximum corrosion
resistance.
If the
design code for the exchangers is ASME ,Sec VIII, DIV-1, then the requirements
of UNF-79 would apply for post forming heat treatments, provided the
tubes are bent in the shop.
Should
the tubes be procured in finishedcondition( U-Bundle) from the mill
then the supplementary conditions of SB-163 would
apply.
The
OD of the tubes and wall thickness are very
small. Hence without proper tube bending devices U-bent areas could get
flattened. See the attached Special Metals brochure for your added
reference.
Thanks.
Pradip Goswami,P.Eng.
Welding
& Metallurgical Engineer/Specialist
Email-pgoswami@sympatico.ca,
pgoswami@quickclic.net
www.opg.com
From:
materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com]
On Behalf Of PB HEGDE
>Sent: Tuesday, July 27, 2010 2:11
AM
>To: materials-welding@googlegroups.com
>Subject: [MW:6138]
Inconel 690 Tube Bending
Dear Friends
I have a query and request you to give your
opinion
a) One of the
Heat exchangers, we want to use U
tubes of Inconel 690 having OD of 13mm and 19mm with thk of
1.2mm
b) Straight tubes
shall be purchased and bending shall be carried in house or at tube
manufacturer
c) I want
to know does it require any solution annealing after U bending ? and if
Yes what will be cooling media and method to avoid flattening of tube near
bend
d) What are
the testing require to ensure correct metallurgical , physical and
mechanical properties
Warm regards
Hegde P.B.
+919714714803
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