Re: [MW:12513] PWHT temperature below tempering temperature

did you check the heat treatment condition of your A106 Gr B pipe? in
case it is supplied as either N&T or Q&T, what is the tempering
tempering temperature on MTC? your PWHT temperature shall be at least
20 °C less than the tempering temperature of the pipe and not 20 °C
less than max PWHT temp given in code. if the pipe is not tempered,
this clause will not be applicable.

for. e.g tempering temp as given in MTC is 650 °C, then your max PWHT
temp will be 630 °C

On Sat, Sep 24, 2011 at 3:06 PM, M S <striarc@yahoo.com> wrote:
> Experts,
> Pls advise, Client spec as below for PWHT
> "For quenched/normalized and tempered steels, the PWHT temperature shall be
> such as to avoid an unacceptable decrease of mechanical properties of the
> parent material; PWHT temperature shall be maintained at least 20 degC below
> the tempering temperature."
> And Client recommend to use PWHT temperature is 593–629 deg C, but as per
> B31.3 it is 593–649 degC. Client reduced 20 degC in the max. temperature
> range(649-20=629)
>
> Material: CS(A106-B > 20mm)
> Is it correct as per spec?
> Regards,
> Stri
>

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