Equivalent to RHA
Equivalent to RHA
(OP)
Our supplier can't supply any more RHA. The mill is busy fulfilling other orders is the reason. I need to find an alternative for testing.
Our vendor recommended 4340 heat treated to RHA, but I do believe our thickness is too thick for a full-thru heat treat. Don't know yet, gotta check the details.
No matter what we do, we'll have to get customer approval for the variation, but I'd like the variation to be as close as possible to RHA. Any ideas?
(Note. Ignore the website in my signature. That's my side job.)
Our vendor recommended 4340 heat treated to RHA, but I do believe our thickness is too thick for a full-thru heat treat. Don't know yet, gotta check the details.
No matter what we do, we'll have to get customer approval for the variation, but I'd like the variation to be as close as possible to RHA. Any ideas?
(Note. Ignore the website in my signature. That's my side job.)
--Scott
http://wertel.eng.pro





RE: Equivalent to RHA
There's also MIL-A-46099, but it doesn't give a composition, and the performance doesn't really match either of the above.
TTFN
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RE: Equivalent to RHA
--Scott
http://wertel.eng.pro
RE: Equivalent to RHA
You'll have a better idea of what to look for if you can understand the threat he is designing for, and which of the properties of RHA he's keenest not to lose.
A.
RE: Equivalent to RHA
Step 1) Find what else is out there.
Step 2a) Determine what alternatives are close to 12560.
Step 2b) Determine if we can obtain said alternatives.
Step 3) Get customer deviation.
--Scott
http://wertel.eng.pro
RE: Equivalent to RHA
Has anyone had experience obtaining materials per the specs but with taking exception to the thickness? In other words, I'd buy MIL-A-46099 or MIL-DTL-46193 except thickness shall be X.X instead of .5 (or .7) inches. I would then include additional flatness and waviness requirements per MIL-A-12560 for the desired thickness. It seems to me that buying a MIL-A-46099 or MIL-DTL-46193 at a different thickness would be the same as buying a MIL-A-12560 and therefore I would still run into the problem with available suppliers of the material.
--Scott
http://wertel.eng.pro
RE: Equivalent to RHA
It seems like a viable solution and I can write up a statement of work to make sure all metrics match MIL-A-12560 except for obvious ones like chemical composition of the material. Therefore performance for penetration testing should be on par.
Has anyone else used 4340 as an alternative?
Any other vendor recommendations?
(Note, any vendor listed may be of value, but the likelihood that your vendor gets its material from the same mill as mine is pretty good, if a US supplier, so in the end it won't make a difference. But, still worth checking into.)
--Scott
http://wertel.eng.pro
RE: Equivalent to RHA
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: Equivalent to RHA
Have you looked at foreign sources for your material. May be difficult to the MIL std but just throwing it out there. Not sure if there'd be import/export/contract/security issues either.
KENAT, probably the least qualified checker you'll ever meet...