L-605 is a cobalt based alloy resistant to oxidation and carburization to 1900°F and has good forming and excellent high temperature properties. Alloy L-605 can only be hardened significantly by cold working. Cold working will increase creep strength up to 1800°F and stress rupture strength up to 1500°F. Strain aging at 700-1100°F improve creep and stress rupture strengths below 1300°F.