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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