HIC re-test after normalizing ?
HIC re-test after normalizing ?
(OP)
I have a plate that is purchased as tested and HIC resistant, but manufacturing process requires normalizing after forming, would this still be acceptable, or is HIC test required after the heat treatment? MR0175 does not spell this out (from what I can tell anyway) and we do not have further client instructions.





RE: HIC re-test after normalizing ?
Some end users believe that a HIC test at the plate mill covers them for a manufactured product irrespective of what treatment the plate has received in the process. My personal take on "representative of the commercial product" is in the final supply condition after all forming and heat treatment.
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: HIC re-test after normalizing ?
RE: HIC re-test after normalizing ?
Plate mills do that by testing specimens in as-delivered heat-treat condition PLUS any simulated expectable condition (e.g. exepcted PWHT of equipment, heat treat of formed pieces etc...).
The reason is that heat treat can dramatically change the microstructure and stress concentrations of your steel, giving rise to variable responses towards HIC resistance in testing.
Generally, a final stress relief in the PWHT range is best to achieve optimized resistance of an oterhwise purposefully elaborated steel intended for HIC resistance (otherwise it is random).
RE: HIC re-test after normalizing ?
However, this was my hypothetical statement. If your normlization was for PWHT, for subsequent hardening, and if the application is very critical, you' d better do a HIC test again.
RE: HIC re-test after normalizing ?