In 718 Alloy Forgings Technical Specifications

1,Chemical Composition:

2,Mechanical Properties:

The mechanical properties shall be determined at the mid-radius location for bars and mid-wall sections for tube.

This test performed on piece at room temperature.

3,Melt Practice

Vacuum induction melting + vacuum consumable remelting

4,Heat Treatment

4.1 Solution Heat Treatment:

Heat to a temperature within the range 1825 to 1850°F(996 to 1010°C), Hold at the selected temperature within ±25°F(±14°C) for a time commensurate with cross-sectional thickness, Cool at a rate equivalent to an air cool or faster.

4.2 Precipitation Harden:

Heat to a temperature within the range 1325 and 1400°F(718°C~760°C),hold at the selected temperature within ±15°F(±8°C) for 8 hours, Cool at 100°F±15(56°C±8)degrees per hour to 1150~1200°F(621~649°C), Hold at the selected temperature within ±15°F(±8°C) for approximately 8 hours and air cool.

4.3 Temperature Measurement: attachment or heat sink thermocouples

5,free of Laves phase

6,Grain Size:

The position shall be at the surface and be an average of ASTM#5.0 or finer with no more than 30%ASTM#3-4.