Inconel 738 is Ni-Cr-Co is a precipitation-hardened deformed superalloy with a temperature below 815℃. Cobalt, chromium and molybdenum were added for solid solution strengthening, aluminum and titanium were added to form γ 'phase, and boron and zirconium were added to purify and strengthen grain boundaries. The alloy has high yield strength and fatigue resistance at 760℃~870℃. It has high oxidation resistance and corrosion resistance in gas turbine atmosphere below 870℃. It is suitable for making turbine disc, working blade, high temperature fastener, flame cylinder, shaft and turbine casing. The main products are cold-rolled strip and hot-rolled sheet, pipe, strip, wire, forgings and bolt fasteners.