I have B91 material to be weld, 6mm and 10mm thickness, however project requirement need to test -20degC impact which I don't really agree due to Cr-Mo is not intended for low temperature application.
I performed PWHT 770degC x 1hr but unable to achieve desired charpy, I was wondering if I extend holding time for 6hr, is it possible to achieve -20degC? (Average 40J).
Welding Process: SMAW and GTAW
Could anyone advise and guide how to achieve desired impact ?
Best regards,
Pravin
-- https://materials-welding.blogspot.com/
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