Centerline cracks!
Centerline cracks!
(OP)
just a question of interest.
Has anyone noticed centerline cracking recently in SAE631 Stainless. Specifically 0.050"?
Has anyone noticed centerline cracking recently in SAE631 Stainless. Specifically 0.050"?





RE: Centerline cracks!
RE: Centerline cracks!
RE: Centerline cracks!
What is the Condition of the 17/7 when you are attempting to weld it?.
RE: Centerline cracks!
We just had a 50lb order of sheet (17-7 condition C) undergo de-lamination in the dead center of the thickness. This occured after wire EDM of the part and also after a light forming step. There really is nothing we can do now, my purchaser cannot find anymore 17-7condC in .050" though. I just posted the question to inquire if anyone else has seen this recently, our supplier is stating that they've got two heats with the same problem.
Thanks for the interest.
nick
RE: Centerline cracks!
The mill that made these heats got out of its league and all such material should go back to it as a claim. You can't fix it.
RE: Centerline cracks!
Was your material really in the C condition? Had it been cold rolled/annealed/cold finished? I have seen 17-7 that had lamination from the rolling. Did yours actually come apart in the center or was it about 1/4th of the way in?
I hate to ask, but which mill produced it? They each have a different set of problems.
= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be slowed down.
RE: Centerline cracks!
Dead center (or therabouts) .0285 - .0235 on .051 (Caliper meas. not accurate but shows how even the cracking was)
Thanks Mcguire, our supplier is refunding the order. I wondered if this was a particularly hard grade to produce, seems to have great properties but there is'nt alot around.
nick
RE: Centerline cracks!
Well straight down the center eliminates one of the comestic mills, theirs is always offset.
= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be managed.
http://www.trenttube.com/Trent/tech_form.htm
RE: Centerline cracks!
You might want to checkout these sites.
Hamilton supplied us with a lot of material with never any problems.
http://www.hpmetals.com/allyspcs.asp
These people did the same except larger sizes.
http://www.eaglealloys.com/stainlesssteelalloys.html
Here is the daddy of the PH steels. I haven’t delt with them in several years but at one time they were a great resource. Two good pieces of information on this page.
http://www.aksteel.com/markets_products/stainless_precipitation.asp