Alloy X-750 has excellent resistance to chloride ion stress-corrosion cracking. It exhibits satisfactory resistance to numerous oxidizing environments. The alloy has similar corrosion resistance to alloy 600 in many media.
lb/cu in...................................... 0.300
kg/cu m...................................... 8303
°F........................................ 2540/2600
Heat Treatment
Alloy X-750 is austenitic under all conditions. The alloy is heat treated by several different methods depending upon the application or requirement. Two common treatments are:
1. For maximum creep, relaxtion and rupture strength at temperatures above 1100°F (593°C):
Solution Treatment - 1800°F (982°C), time commensurate with thickness, air cool.
Intermediate Age - 1550°F (843°C), 24 hrs, air cool.
Final Age -1300°F (704°C), 20 hrs, air cool.
2. For highest room temperature yield strength and tensile ductility:
Stress Equaliztation - 1625°F (885°C), 24 hrs, air cool.
Precipitation Age - 1300°F (704°C), 20 hrs, air cool.
Workability
The furnace temperature should be 2100°F (1149°C)-for optimal starting temperatures of 1950/2000°F. For service below 1100°F (593°C), higher strength can be obtained by combining some cold work with heat treatment because the effects are additive.
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