%Cold Worked 304SS
%Cold Worked 304SS
(OP)
I am trying (with no success) to locate some 304SS plate in several different conditions of cold working i.e. 0% (annealed)10% CW, 20% CW etc. Does anyone know of a supplier that carriers 304SS plate (1/2" thick) in varying conditions of cold working (rolling). I am trying to investigate relationship beetween Cold Work % and time to failure when subject to stress corrosion cracking.
any help much appreciated.
any help much appreciated.





RE: %Cold Worked 304SS
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Another supplier I have worked with is Scott Forge. The last time I had audited them they had a small rolling mill. They are helpful folks.
http://www.scotforge.com/sf_materials.htm
RE: %Cold Worked 304SS
Be careful when you start loading your test samples. Often SCC testing is done at 100% of yield. When you have an annealed sample at 40ksi yld and 90ksi UTS that is one thing. But what about a worked sample at 160ksi yld and 175ksi UTS? You can't load that sample to full yield and then say that cold work is the only significant difference.
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RE: %Cold Worked 304SS
RE: %Cold Worked 304SS
= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection
http://www.trent-tube.com/contact/Tech_Assist.cfm
RE: %Cold Worked 304SS
FYI I am aware of existing work on this subject, my investigation is quite a bit more complicated than I mentioned above, however, I am not at liberty to discuss specifics. Suffice to say there is a reason I need cold worked 1/2" thick plate vs. the conventional wire or thin bend samples used in Boiling MgCl2 testing (ASTM, other work etc.).
Ed, the statistical (probabalistic) approach is indeed what I am using for my investigation. There are an additional number of variables I am concerned with outside of the time to failure. Thanks for the advice though.
Again, thanks to both of you
RE: %Cold Worked 304SS
I have always wanted to do some CSCC testing involving electrochemistry. This way you could deliberatly break the passive film without having to wait. This is the biggest hangup with doing tests in less agressive environments, the time gets so long that it isn't practical.
= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection
http://www.trent-tube.com/contact/Tech_Assist.cfm
RE: %Cold Worked 304SS
I have done some accelerated electrochemical corrosion investigations (mainly w/ 7000 series Al)with regard to post machining surface enhancement and the effect on the polarization curve. The tests are very quick and allow an in depth analysis of the DC polarization curve. I have not tried it with the specimen under any load though, just simple rect. coupons. The testing takes only around 30-40 min and provides usefull comparisons in a condsiderably shorter amount of time. Standard SCC in say 3.5% NaCl takes forever, I have made a habit of spiking my solutions (if appropriate) with NaNO3 to speed things up a bit.