Class 60 grey iron?

[Binder]

I'm looking at what grey iron to use in an engine sleeve application. Class 60 appears to have most of the psi tensile and wear factors needed. Does anyone have a better idea?

Thanks,
Binder

 

[MOB1]

These are usually pearlitic grey irons so Grade 60 should be OK. I would insist on a microscopic examination of appropriate samples to ensure that graphite is OK and that the matrix contains no ferrite or carbides.

 

[Binder]

Thanks for the help. I thought it would be a good material. Thanks, Binder

 

[Mike450]

Class 60 gray iron might be a difficult animal to produce - class 50 is usually at the top end of the gray iron as cast range. Higher tensile strength gray irons need low carbon equivalent iron with supplementary alloying to reach the high tensile properties and these are prone to carbides especially in thin sections such as sleeves.
Thin section cast iron sleeves quite often display a microstrucure that is undercooled, type D graphite which will be associated with ferrite unless pearlite promoting elements are increased (Cu, or Sn). The undercooling can be an indication of the risk of carbides in the microstructure. The Type D graphite with associated ferrite
will limit the tensile strength and class 50 would not be likely. Some of these sleeves are centifugally cast in steel molds (rapid cooling) and some are sand cast, slower cooling and so the end result would be different.
I'm not a design engineer so I'm not sure why you want to go to class 60.