Dear Mrithyunjay,
For the 3.5% Nickel steel, it is client to say what hardness they want.
Nace requirement is 248 HV10.
The post heating of 350 Deg.C does not seem to have much impact on HIC testing.
Thanks and Best regards,
K.Rajagopal
On Thu, Sep 29, 2011 at 9:09 AM, mrithyun jay <mrithyun.j@gmail.com> wrote:
Hello Everyone,
Currently I am qualifying a welding procedure for a pressure equipment
which involves 3.5% Nickel steel. The design code is ASME VIII Div 1,
the query is what is max. permitted HAZ hardness for this material. I
have got two indentations 278 and 280 vickers 10kg in cap HAZ, whilst
the others are well below 250HV10.
WT of the coupon was 10.97mm and I have done a post heating at 350°C
for 2 hours (assuming it would be beneficial to address HIC). I
haven't done any PWHT.
NB: Client is not sure of the permitted max. hardness, from memory -
being a ferritic steel, I would assume max. permitted is 250 for NACE
applications.
I would like a confirmation from the group members, whether my
assumption is correct?
Thanks everyone
Mrithyunjay.
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