13-8MO Stainless Steel is a Precipitation Hardening martenistic stainless steel, hardened by a single age H950-H1150°F temperature range. Corrosion resistant, excellent fracture toughness and mechanical properties used for high strength applications. UNS S13800 XM-13. VIM/VAR Vacuum Induction Melted followed by Vacuum Arc Remelt. Vasco 13-8MO.