W240 overlay alloy is used in "Techniques for Long Life Materials Applied to Continuous Caster Roll" article written by Y. Satoh et al.(Link below)
I think that is like 414 Martensitic SS but in other standard name. So, I am not sure about its composition.
Thanks All.
http://www.jfe-steel.co.jp/archives/en/ksc_giho/no.45/tobira042.html