IN738
IN738 is a nickel base precipitation hardening equiaxed grain casting superalloy. It is one of the alloys with the best thermal corrosion resistance. The service temperature is less than 900 ℃. The alloy contains high chromium, tantalum and niobium.
Equivalent Grades
| Trademark | GB | GOST | ASTM | UNS | DIN | W.Nr. | NF | BS | JIS | SS |
| – | K438 | – | IN738 | – | – | – | – | – | – | – |
Chemical Composition, %
| Alloy | C | Si | Mn | P | S | Cr | Ni | Co | W | Mo | Al | Ti | Nb | Ta | B | Zr | Fe |
| IN738 | 0.1-0.2 | ≤0.3 | ≤0.2 | ≤0.015 | ≤0.015 | 15.7-16.3 | Bal | 8.0-9.0 | 2.4-2.8 | 1.5-2.0 | 3.2-3.7 | 3.0-3.5 | 0.6-1.1 | 1.5-2.0 | 0.005-0.015 | 0.05-0.15 | ≤0.5 |
Typical Physical and Mechanical Properties (RT, Solution Annealed)
| Density, g/cm3 | Melting Point, ℃ | Tensile Strength, MPa | Yield Strength, MPa | ELongation, % | Hardness, HRB |
| 8.16 | 1260-1330 | 1030 | 880 | 8 | / |
Available Products and Specifications
| Rod, Bar, Wire and Forgings | – |
| Plate, Sheet and Strip | – |
| Pipe and Tube | – |
| Welding Product | – |
| Others | – |
Features
The alloy has excellent thermal corrosion resistance, medium high temperature strength and good structural stability.
Applications
Alloys have been widely used in long-life turbine blades and guide vanes of ships and ground industrial gas turbines, as well as turbine parts and corrosion-resistant parts of aeroengines.
