17-7PH questions
17-7PH questions
(OP)
I have an application that is currently using Half Hard 304. This grade is not stiff enough for my application and I'd like to use 17-7PH to get a stiffer part.
The application uses very thin sheet (0.2mm to 0.7mm thick) that is formed then laser welded together.
My questions are:
(1) Is 17-7PH available in thin sheet in this range?
(2) I have read that 17-7PH when transformed to condition C at the mill is magnetic. It there a heat treatment process that does not result in a magnetic part?
The application uses very thin sheet (0.2mm to 0.7mm thick) that is formed then laser welded together.
My questions are:
(1) Is 17-7PH available in thin sheet in this range?
(2) I have read that 17-7PH when transformed to condition C at the mill is magnetic. It there a heat treatment process that does not result in a magnetic part?





RE: 17-7PH questions
(a) Yes, it is possible to obtain 17-7PH in that thickness. Suppliers include Somers Thin Strip and Ulbrich:
http://www.olinbrass.com/companies/somers/Products...
http://www.ulbrich.com/index.php/design/design/pag...
(b) The stip can be annealed after cold rolling, which changes the microstructure back to an austenitic form, which is not magnetic. However, this removes the strain hardening and thus the increased strength.
RE: 17-7PH questions
How far you deflect it before it takes a bend will change as you change strength.
Your half hard 304 is magnetic, is this a problem?
The annealed 17-7 is not much stronger than any annealed SS.
If you want maximum strength you anneal at 1725F, cold roll, hold at -100F, age at 900F.
If you need strength and non-magnetic have some 21-6-9 (S21904) cold rolled. It is still fully non-magnetic at 160ksi UTS.
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Plymouth Tube
RE: 17-7PH questions
RE: 17-7PH questions
Doug
RE: 17-7PH questions
it has very little dimensional changes.
Mfgenggear
if it can be built it can be calculated.
if it can be calculated it can be built.