HIC Testeing
HIC Testeing
(OP)
Is it common practice to do HIC testing on forgings? (In sour services)
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RE: HIC Testeing
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: HIC Testeing
My suggestion is that materials for source service shall be with HIC test. See NACE standard 0284.
Regards.
RE: HIC Testeing
My $0.02 (CDN) worth:
I don't believe forgings have the same level of susceptibility to hydrogen induced cracking as do the rolled skelp products. Maybe there is the presence of lap seams in the forging that might behave similarly to HIC-sensitive sites.
Regards,
SNORGY.
RE: HIC Testeing
RE: HIC Testeing
RE: HIC Testeing
RE: HIC Testeing
Having said all that, the only way to finally prove the forging is to test it. I have seen valve and flange forgings fail, but there has been no post mortem to see whether the steelmaking was at fault.
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: HIC Testeing
I guess what you are saying is that while the mechanisms are different, the conditions (chemically and micro structurally) giving rise to them are similar. OK, upon typing this, that makes sense to me now.
Can you elaborate a bit on how the entrapment of molecular hydrogen at voids is beneficial? Is it sort of like the hydrogen sponges out the other trace elements that otherwise might precipitate at grain boundaries?
Metallurgy is not my thing...kind of a black art to me.
Regards,
SNORGY.
RE: HIC Testeing
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: HIC Testeing
Regards,
SNORGY.