Yes I agree!!
-- In general Tempering temperature of Materials need to higher the PWHT holding temperature.
During the ordering/Procurement of Materials care needs to be taken in order to about minimum tempering temperature of Materials & same needs to be higher than the intended PWHT temperature however same shall not exceed Lower critical temperature of same materials.
Eg:
EIL specifications states that tempering temperature of Materials should be 20-25Deg C more than PWHT temperature.
ASME B31.3 States that there should be minimum 28Deg C more
Shell DEP states - 20DegC more
UOP process licensor says 25Deg C more
Regards
Anil YARROLU
On Mar 18, 2018 5:55 PM, "Prabhu kumar Loganathan" <prabhu_rec@rediffmail.com> wrote:
Hi Prasad,
I do not understand, why is it not retain properties after PWHT of F65 forgings?
Most of F60 or F65 materials are supplied in Q&T condition with tempering at 540 Deg. C as per ASTM A694, unless you specifically asked for tempering temperature of at or above 660 Deg. C since it has to be stress relieved at 650 Deg. C. Unless you specify in PO specification, vendor will not supply with above condition and hence you cannot stress relieve F65 materials with 650 Deg. C.
If F65 is delivered with tempering temperature of >660 Deg. C then obsoletely you can use it with stress relieving. All these conditions shall be included in the PO specification and it can be available in the market.
Regards,
L. Prabhu kumar
Ph. no. 9003010978/ +968 95202761
From: N VENKATESWARA PRASAD <weldengr.velosi@gmail.com>
Sent: Wed, 14 Mar 2018 19:22:18
To: materials-welding <materials-welding@googlegroups.com >
Subject: [MW:27517] ASTM A 694 F 65 FLANGES
Hi Experts,We are using ASTM A 182 F 22 materials in sub sea tree parts. These forgings needs to be welded to ASTM A 694 F 65 pup pieces. We need to do PWHT at 650 deg. C for 6 hours. The F 65 forgings can not retain the properties due to PWHT. Hence we are doing buttering the F 22 and carrying out PWHT and then welding to F 65 forging with out PWHT.I am looking for supplier who can provide the F 65 forgings which can retain its properties with PWHT. It shall meet the the mechanical properties including hardness ( 250 Hv10) in the as welded and PWHT condition also. This will give more savings as we are avoiding buttering.Please share if your have any details on it.RegardsPrasad--
https://materials-welding.blogspot.com/
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