Shaft torsion at cryogenic temperatures 1

[Burdy]

I cannot find any recommendations for materials being used as shafts in cryogenic conditions. Shear modulus / modulus of rigidity always appear to missing from the majority of materials I do search on.
Can anyone recommend any material with a shear modulus greater than 87 GPa (17-4PH)?
There appears to be a lot of information about cryogenic conditioning but very little data on the properties of material at those temperatures!
Hope someone can help.
Br
Bernard H

 

[mcguire]

For high strength at cryogenic temperatures you definitly want something from the 201 family of stainless steels. Especially for a shaft. Get cold-drawn 201. The super material is 21-6-9, but that's harder to find.

 

[Burdy]

Mcguire,
Being based in the UK I am finding it extremely difficult sourcing the 201 material such that no-one can get it for me. What suppliers have you used?

 

[Maui]

The material you select, whatever it ends up being, should have an FCC microstructure. DO NOT select materials with either a BCC or HCP microstructure. These materials are subject to the ductile to brittle transition, and will fail catastrpohically at sufficiently low temperatures.


Maui

 

[mqas]

I have used ASTM A564 Grade 660 on valve stem at -120C and this is available from many UK suppliers.