52CrMoV4 1.7701 vs 5160 vs 6150 for spring material 2

[mgh70]

All,

I am looking for the pros and cons comparing 52CrMoV4 1.7701, 5160, and 6150 for spring application.

Currently have a requirement for 5,000 minimum cycle life, with stress levels at 136,000 lbs/in^2 at the top of its working deflection (bar dia of 2.687"). Possible saline conditions. Temperatures from 34F-151F.

Thanks in advance,

mgh

 

[CoryPad]

5160 pro: lowest cost
5160 con: lowest hardenability (likely cannot through harden 2.687" bar), no vanadium to resist grain coarsening during hot deformation

6150 pro: lower cost than 52CrMoV4, sufficient hardenability for this application, contains vanadium to resist grain coarsening during hot deformation
6150 con: higher cost than 5160

52CrMoV4 pro: highest hardenability, highest resistance to hardness/strength loss due to elevated temperature exposure, contains vanadium to resist grain coarsening during hot deformation
52CrMoV4 con: highest cost

 

[mgh70]

Thanks for the helpful response CoryPad.

I assume all three have the same chemical compatibility in saline conditions?

-M

 

[CoryPad]

Yes, they all will corrode equally in saline environments. Corrosion protection (e.g. non-electrolytic zinc-rich coating, cathodic electrocoating) is recommended.