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Nickel Alloy X-750/ Inconel X-750®
Technical Data Sheet
Alloy X-750 is a nickel-chromium alloy which has been made precipitation-hardenable by the additions of aluminum and titanium. Alloy X-750 has good resistance to corrosion and oxidation along with high tensile and creep rupture properties at temperature up to 1300ºF (700ºC). Due to X-750's excellent relaxation resistance it is useful for applications as high-temperature springs and bolts, X-750 is also used in gas turbines, rocket engines, nuclear reactors, pressure vessels, tooling and aircraft structures.
| Chemical Composition Limits | ||||||||||||
| Weight % | Ni +(Co) | Cr | Fe | Ti | Al | Nb + (Ta) | Mn | Si | S | Cu | C | Co |
| X-750 UNS N07750 | 70 min | 14-17 | 5-9 | 2.25-2.75 | 0.40-1.0 | 0.70-1.2 | 1 max | 0.50 max | 0.01 max | 0.50 max | 0.08 max | 1 max |
| UNS N07752 is available in billets for forging. UNS N0772 has limits of 0.05% on both Carbon and Cobalt | ||||||||||||
Typical Mechanical Properties
| Material | Size | Ultimate Tensile Strength ksi | Yield Strength (0.2% Offset) Ksi | Elongation in 4D(%) | % Reduction of Area |
| Alloy X-750 Bar | Under 4.0" | 165.0 | 105 | 20 | 25 |
| Alloy X-750 Bar | 4.0 " and over | 160 | 100 | 15 | 17 |
| Properties as described in AMS 5667 which requires that material following 1625°F/24 hrs, AC-Equalising + precipitation treatment have the following minimum room temperature properties. Hardness will lie in the range of 302-363 BHN | |||||
Rod, Bars and Forgings are available with the following heat treatments
AMS 5667 - 1625°F/24hr, AC + 1300°F/20 hr, AC (Equalising plus precipitation treatment). AMS 5667 Rod, Bars and Forgings have high strength and notch rupture ductility up to 1100°F
AMS 5668 - 2100°F anneal + 1550°F/24 hr, AC, +1300°F/20hr, AC (triple heat treatment). AMS 5668 has maximum creep, relaxation and rupture strength above about 1100°F.
AMS 5670 - 1800°F anneal + 1350°F/8hr, FC to 1150°F. Hold at 1150°F for total precipitation-treating time 18 hr, AC (solution treatment plus furnace cool precipitation treatment). Due to the heat treatments AMS 5670, AMS 5671 and AMS 5747 have increased tensile properties and reduced heat treatment time service up to about 1100°F.
With a heat treatment of 1800°F anneal + 1400°F/1hr, FC to 1150°F, hold at 1150°F for total precipitation-treating time of 6 hr, AC (solution treatment plus short furnace-cool precipitation treatment). This treatment of short furnace cool aging achieves only slightly lower properties than does AMS 5670 and AMS 5671.
Rods and Bars X-750 is available from 1/2" diameter to 6" diameter in 1/4" increments. From 6" diameter to 10" diameter it is available in 1/2" increments.
| Material | Size | Tensile Strength ksi | Yield Strength (0.2% Offset) Ksi | Elongation in 2"(%) | % Hardness Rc |
| Alloy X-750 Sheet Annealed Condition | 0.010 to 0.024", incl | 140 max | - | 30 min | - |
| Alloy X-750 Sheet Annealed Condition | over 0.024 - 0.125" incl | 130 max | 60 max | 40 min | - |
| Alloy X-750 Sheet Annealed Condition | over 0.125 - 0.250 incl | 130 max | 65 max | 40 min | - |
| Alloy X-750 Sheet After Precipitation Treating (1300°F/20hr, A.C) | 0.010 to 0.025 incl | 165 min | 105 min | 20 min | 32 min |
| Alloy X-750 Plate After Precipitation Treating (1300°F/20hr, A.C) | 0.187 to 4.000, excl | 155 min | 100 min | 20 min | 30 min |
Sheet, Strip and Plate are available with the following heat treatments
AMS 5542 - 1300°F/20hr, AC (Constant-temperature precipitation treatment). AMS 5542 has high strength up to 1300°F
AMS 5598 - 1350°F/8hr, FC to 1150°F, hold at 1150°F for total precipitation-treating time of 18hr, AC (furnace-cool precipitation treatment. AMS 5598 has high strength up to 1300°F (Increased tensile properties to about 1100°F).
With heat treatment 1400°F/1hr, FC to 1150°F hold at 1150°F for total time of 6hr, AC (short furnace-cool precipitation treatment).
| Material | Tensile Strength ksi | Yield Strength ksi | Elongation in 4D(%) | % Reduction of Area | Hardness |
| Alloy X-750 N07752 Type 1 | 160-185 | 100-130 | 20 | 20 | 27-40 HRC |
| Alloy X-750 Heat Treatment - Solution Treat 1.2 hrs @ 1975°F and Air Cool Precipitation Heat Treat 20 hrs @ 1320°F and Air Cool | |||||
UNS N07752 is available in billet for forging. UNS N07752 has limits on the Carbon and Cobalt levels (each has a maximum of 0.05%).
Availability
Alloy X-750 is available in Round Bar, Flat Bar, Sheet, Strip, Plate, Forging Stock, Hexagon, Wire, Tube, Welding Wire and Extruded Section . Ex-stock is available in Round Bar - Equalized or Sheet & Plate. For all stock availability contact Sales.
Specifications
| Rod | ASTM B 637, ASME SB 637, ISO 9723, ISO9724, ISO9725, AMS 5667, AMS 5668, AMS 5669, AMS 5670, AMS 5671, AMS 5747, EN10269 |
| Bar | ASTM B 637, ASME SB 637, ISO 9723, ISO9724, ISO9725, AMS 5667, AMS 5668, AMS 5669, AMS 5670, AMS 5671, AMS 5747, EN10269 |
| Forging Stock | ASTM B 637, ASME SB 637, ISO 9723, ISO9724, ISO9725, AMS 5667, AMS 5668, AMS 5669, AMS 5670, AMS 5671, AMS 5747, EN10269 |
| Plate | ISO 6208, AMS 5542 and AMS 5598 |
| Sheet | ISO 6208, AMS 5542 and AMS 5598 |
| Strip | ISO 6208, AMS 5542 and AMS 5598 |
| Wire | BS HR 505, AMS 5698, AMS 5699 |
| Other | UNS N07750, W.Nr 2.4669, Inconel X750 (tradename), UNS N07752 |
