Mechanical properties of Superduplex

[Steve126]

Can anyone tell me the elastic modulus (Young's Modulus) for superduplex at -40 deg.C to plus 60deg.C with sufficient detail inbetween to generate a curve?

Many Thanks

Steve126

 

[NickE]

just a guess but should be close to

30000ksi

nick

Nick
I love materials science!

 

[RPstress]

2507 and 2205 at RT both come in at 29 Msi according to a document on 'super' stainlesses called "High Performance Stainless Steels" from NiDI (

http://www.nidi.org

). Some other super duplex grades are between 27.6 and 30.5 Msi. According to MIL-HDBK-5 austenitic (300 series) st st changes modulus by 0.02% per degree F between RT and 800 F (it's very linear). I see no reason why this trend should change markedly below RT. Precipitation hardening stainlesses change by between 0.014% to 0.024% per F, with a bit less linearity (usually rate of change is slowing down as it gets colder). It also matters if you're interested in tensile or compressive modulus. Compressive modulus can easily be an Msi different from tensile, and the rate of change can be double that for tensile.

All this would give you guestimated tensile moduli between 29.8 and 29.5 Msi at -40 to between 28.5 and 28.7 at +60 C.

However, these things aren't all that accurate, and it might be fairer to say that at -40 you've probably got between 29 and 30 Msi, and at +60 C you've probably got between 28 and 29 Msi.

Even this may be a bit too precise. What's the actual material?? If you've got that, then try queueing a query with NiDI or at

http://www.azom.com

.