treatment. Can you confirm which one?
(1) receive the head in the formed and normalized condition (910C),
weld the head on the vessel, then stress relieve the welded vessel at
610C
or
(2) receive the head in the formed condition, weld the head on the
vessel, then normalize at 910C and stress relieve the entire vessel
at 610C
It was confusing to me.
Thanks,
On Aug 24, 8:55 am, rupesy <jrup...@dresser-rand.com> wrote:
> I know you main question is about chemistry, but I just can't hold
> back some other comments about this qualification.
>
> You may not have an issue with ASME Section IX and chemistry matching
> as much as some other issues. The filler wire is a "G" classification
> in which the chemistry is not required and only needs to meet the
> requirements of one of the elements. How will the supplier
> demonstrate that the wire will meet the clients requirements for the
> filler metal chemistry? The NACE MR0175 has a nickel restriction of
> 1% max. I would expect that the suppler will be supplying a weld
> metal chemical analysis with the test plate or actually running an
> undiluted filler metal chemisty test to demonstrate the wire meets the
> clients requirements before proceeding with the test plate.
>
> Why are they selecting a filler wire with a minimum tensile of 90 ksi
> vs the 60 ksi max on the A516 Gr 70. It is permissble to do this, but
> your weld metal has about 50% higher tensile strength than the base
> material. This is usually not a good practice since normally it is
> good practice to match the strength of the filler with the base
> material. Seems like a 7018 rod with a matching SAW wire would much
> more easily meet the requirements of hardness, chemistry, and have
> less issues with hydrogen cracking, etc.
>
> Its seems like it will be difficult to meet 200 HB in the weld metal
> with a 90 ksi filler wire with a 610C post weld heat treat. However,
> maybe they have some experience with this wire strength. I would be
> very interested in the vickers hardness results of the crossection and
> the Brinell hardness test of the weld surface.
>
> Are there any impact requirements? The G classification does not
> specify impacts. If impacts were required, I would only approve the
> heat that was tested.
>
> In the end, if the supplier wants to run the test plate and he can
> demonstrate he can meet all of the requirements such as weld metal
> chemistry, 200 HB max weld deposit hardness, 250 HV HAZ hardness,
> bends, tensiles, impacts, then go ahead and let them proceed. But
> seems like there is a much easier path.
>
> Please, just my opinions and I have seen many things done that people
> have said can't be done......would be very intereted in the results of
> the testing.....
>
> On Aug 23, 2:51 pm, "Aly" <mhaskar....@gmail.com> wrote:
>
>
>
> > Dear All,
> > We are getting Heads for pressure vessels from Supplier in Saudi, The head
> > requirements are as follows:
>
> > Head: 28mm thk; SA516 Gr 60, NACE MR 0175 & HIC tested NACE TM 0284
> > Construction Code ASME SEC VIII Div 1, E2007 Ad2009.
> > Type of Head Ellipsoidal with chordal seam (U stamped)
> > Service For Pressure vessel in Sour Service
> > HT: Normalization at 910deg C for after forming & SR at 610 deg C along
> > with vessel.
> > Chemistry restriction by Client: C= 0.06% Si=0.24%, S= 0.007 & P=0.015,
> > Hardness 200BHN
> > Simulation Testing for HT (NR+SR) on test plate required.
>
> > Now the supplier has submitted me WPS / PQR for welding chordal seam of head
> > for my review, the details of PQR as follows:
> > Base metal SA516 Gr70; 90mmthk
> > SMAW with E9018-G; SFA 5.5; A=10; F no. 4
> > SAW with F9P6 EG F3; SFA 5.23; A=10; F no. 6
> > HT= NR+SR
>
> > The weld metal composition achieved on PQR for SAW process are C=0.06%, Mn=1
> > 37%, Si=0.24%, S% <0.005, P=0.014%, Mo=0.48%, Ni=0.82%, Cu=0.13%.
>
> > Tensile& bend test meeting requirements of Base metal.
>
> > My Question is whether the proposed filler metal is acceptable to this base
> > metal (SA516 Gr 60) as per ASME SEC IX as weld metal chemical properties are
> > not meeting the base metal requirements.
>
> > Thanks for co operation in this regard
>
> > Aly
> > Kuwait
>
> > panda_hello.gif
> > 27KViewDownload
>
> > stampa_girl_line_en.gif
> > 61KViewDownload- Hide quoted text -
>
> - Show quoted text -
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