HY-industry has supplied the first batch of Inconel783 rods for adjusting valve screw in BHEL India on 2017-11-23

HY 783 Material grades and equivalents

Inconel 783 / Alloy 783 / UNS R30783

An oxidation resistant low coefficient of thermal expansion (low CTE) superalloy developed for gas turbine applications. The alloy is strengthened by a precipitation-hardening heat treatment made possible by additions of niobium and aluminum. In addition, the aluminum content provides excellent resistance to oxidation at high temperature. The alloy’s density is 5% less than those of superalloys such as INCONEL alloy 718. The combination of low expansion, high strength and excellent resistance to oxidation makes the alloy especially useful for gas turbine and steam turbine components. The low expansion enables closer control of clearances and tolerances for greater power output and fuel efficiency.   Table 1 – Limiting Chemical Composition*, % Chromium……………………………………………………………. 2.5-3.5 Nickel ……………………………………………………………….26.0-30.0 Iron ……………………………………………………………………24.0-27.0 Niobium…………………………………………………………………2.5-3.5 Aluminum………………………………………………………………5.0-6.0 Cobalt………………………………………………………………Remainder Boron……………………………………………………………..0.003-0.012 Carbon………………………………………………………………0.03 max. Manganese………………………………………………………..0.50 max. Silicon……………………………………………………………….0.50 max. Phosphorus……………………………………………………..0.015 max. Sulfur ……………………………………………………………….0.005 max Titanium…………………………………………………………………0.1-0.4 Copper……………………………………………………………….0.50 max   Physical Properties   Table 2 – Physical Constants Density, g/cm3…………………………………………………………..7.81 lb/in3………………………………………………………….0.282 Melting Range, °F ……………………………………………..2437-2565 °C …………………………………………….1336-1407 Specific Heat, Btu/lb•°F (77°F)……………………………………0.109 J/kg•°C (25°C)……………………………………….455