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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)

Nb + (Ta)

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

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Disclaimer
Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.