Rene® 41, Aerospace Material Specification 5800 is nickel alloy in welding wire form.

Ni: BAL% | Cr: 18.0-20.0% | Co: 10-12% | Mo: 9.0-10.5% | Ti: 3.0-3.3% | Al: 1.4-1.6% | B: 0.003-0.010%