hardened valve seats

[Hans Hintermaier]

Hi there, metallurgists and engine-recyclers.
Does anybody of you know what (generally available) material
I can use for unleaded-fuel-valve-seats? I am just working on an old
motorcycle with aluminium head, which needs the valve seats to be 
replaced. Could be X210 Cr Wo 12 the right thing? (I hope it's 
international standard)
Thanks
Hans
 
hiha@ brain.nefo.med.uni-muenchen.de
Munich / Germany