Thermal conductivity of metal. Since silver 420w/mk is way more conductive than titanium (420w/mk vs 21w/mk), it could be heated up in no time and vaporize more efficiently. It should be
Thermal conductivity of the carbon steel | Download Table
Appendix - Schöck Ltd
AISI 310 Stainless Steel - Properties
How to Find the Thermal Conductivity of a Material Connecting Two Systems Using the Law of Thermal Conduction | Physics | Study.com