Aerospace Material Specification 4776 is nickel alloy BNi-1a in welding wire, welding rod, powder, and paste. Typically used for joining corrosion and heat resistant steels and alloys for corrosion and oxidation resistant joints at elevated temperatures.

Ni: 73% | Si: 4.5% | Cr: 14% | B: 3.1% | Fe: 4.5%