medium manganese steel

[MikeMilburn]

Would someone enlighten me on the specifications of 'medium manganese steel", it's one of the specifications on a cast sheave I'm working with and trying to send out to tender. Not being a metalurgist but the term 'medium' strikes me as vague, shouldn't there be a percentage in there somewhere or a more definite figure??...Mike

 

[Metalguy]

Hmmm, you can eliminate the Hadfield alloys on this one!

Need more info here. Do the sheaves get heat treated (hardened and tempered)? Mn has two main purposes in Q&T steel, but for annealed steel its use it to combine with S and form relatively harmless MnS inclusions instead of FeS.

I wonder if the spec. meant a med. carbon-Mn. steel. In any event, you probably want at least 0.60 Mn or so, but I don't know much about just what steel properties you're after.

 

[MOB1]

I agree with Metalguy but it may also be that the sheave is to be selectively hardened in the rope groove and the specification is to give a Mn content to help get the depth of hardening correct. Sometiimes a steel such as 1340 type is used.

 

[Metalguy]

One more case where the orig. poster has apparently lost interest or found an answer and didn't feel like letting us know.