metal interface region is failing in ASTM 262 Method E test. Carbon
content of 304H plate is .07%, GTAW (manual process), Heat input 60KJ
max, Interpass temp 150°Cmax. Filler 304L, size 3/32", plate thickness
1/2".
Fissures are found during bend test after 15hours soak in 16%Sulphuric
acid. This occurs at HAZ interface.
I did a micro at failure portion and found Chromium carbide
precipitates along the grain boundary and cracks along the grain
boundary.
Plate material was ordered to pass 262 Method E and it was reported as
passed. 304H is non stabilized grade and it has to be H for the
application. Solution annealing cannot be done due to size of the
component. What are your suggestions / tips to fine tune welding and
get rid of this problem?
Thanks in advance.
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