just for reference manganese is a chemical element that is often added to steel (in particular stainless steel) to remove sulphur impurities and thereby increase rigidity, when you add between 9-12.5% manganese to steel you get what is known as Hadfeild steel, which is extremely resistant to impact and abrasion but is consequently much harder to shape while cool (luckily it has a lower mailable temp than standard steel, meaning it casts and forges easier)
so in answer to your statement, yes manganese alloy is good, very good, means less track shredding ect and therefore less time having to bugger around fixing tracks and re-tensioning them
speaking of which is it just me or do a lot of the tanks from this era seem to have the track repair/maintenance
modus operandi of 'get the track in position, then wedge it with a chunk of wood or whatever you have lying around and then bodge it with a wrench and/or hammer until it looks right, the track is now properly installed' ? you'd think for such an important and relatively high maintenance part of a tank they'd have a more streamlined method of repair (not to mention safer)