Nickel Alloy Inconel X-750
UNS N07750 · EN 2.4669, NiCr15Fe7TiAl
Inconel X-750 (N07750, 2.4669, NiCr15Fe7TiAl) is a precipitation-hardenable Ni-Cr-Fe alloy strengthened by γ′ titanium and aluminium precipitates, giving 815 MPa yield and 1200 MPa tensile strength with corrosion resistance up to 704 °C.
Reference datasheet — Inconel X-750 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the STA condition
Inconel X-750 tempers and conditions
Inconel X-750 is supplied in 7 conditions, soft to hard. STA is the default FabDigit quotes; the values on this page are for it.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Softest, most formable and weldable condition; used as supply state for forming, deep drawing and machining before ageing. | 350 | 830 | 45 | 180 HB | — |
Equalized | Intermediate stabilising treatment for bar/forgings that will be single-aged; gives best RT and mid-temperature strength after ageing. | 480 | 900 | 35 | 18 HRC | 1.4 % IACS |
STADefault Solution treated and aged | Standard turbine/aerospace condition (AMS 5667 bar): best balance of RT strength, creep-rupture and stress-relaxation resistance to ~700 °C. | 815 | 1,200 | 25 | 32 HRC | — |
Equalized 885 °C/24 h + aged 704 °C/20 h | Highest room- and mid-temperature strength condition for bolting, bar and forgings used below ~650 °C. | 860 | 1,275 | 23 | 35 HRC | — |
Hot rolled / hot finished + aged 732 °C/16 h | Economical bar/rod condition for bolts, studs and general high-temperature hardware below ~600 °C. | 900 | 1,300 | 22 | 36 HRC | 1.4 % IACS |
Spring hard | Cold-worked wire/strip supplied for coiling or forming; must be aged after forming to develop final spring properties. | 1,170 | 1,380 | 6 | 42 HRC | 1.4 % IACS |
Cold drawn + aged 732 °C/16 h | Final condition for high-temperature springs, clips and seals: highest strength and best stress-relaxation resistance to ~540–650 °C. | 1,280 | 1,550 | 8 | 45 HRC | 1.4 % IACS |
Supply forms, finishes and certifications
Ways Inconel X-750 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
SHT+AGE-SHEET | Sheet/strip | Supply form |
What is Inconel X-750?
Inconel X-750 (N07750, 2.4669, NiCr15Fe7TiAl) is a precipitation-hardenable Ni-Cr-Fe alloy strengthened by γ′ titanium and aluminium precipitates, giving 815 MPa yield and 1200 MPa tensile strength with corrosion resistance up to 704 °C. It is chosen for elevated-temperature spring and bolting hardware and is supplied as bar, wire, strip and sheet in annealed, equalized, spring-temper and various solution-treated plus aged conditions. Weldability is limited (score 40) by strain-age cracking risk, machinability is low (15) and springback in forming is large. Alloy 718 is the easier choice for welded fabrications below 650 °C. Inconel X-750 has a density of 8.28 g/cm³ (0.299 lb/in³), lighter than 55% of nickel alloy grades. It melts at 1,393°C (2,539 °F). Inconel X-750 has a yield strength of 815 MPa (118 ksi) and a tensile strength of 1,200 MPa (174 ksi) — stronger than 85% of nickel alloy grades. Elongation at break is 25% and the elastic modulus is 214 GPa (31 Msi).
What is Inconel X-750 used for?
- gas turbine blades and bolts
- springs at elevated temperature
- jet engine seals
- nuclear reactor springs
Advantages
- High strength — 815 MPa (118 ksi), better than 85% of nickel alloy grades
Inconel X-750 properties
Typical room-temperature values for Inconel X-750-STA; bars are the position among nickel alloy grades.
Physical3
Inconel X-750 has a density of 8.28 g/cm³ (0.299 lb/in³), lighter than 55% of nickel alloy grades. It melts at 1,393°C (2,539 °F).
Mechanical16
Inconel X-750 has a yield strength of 815 MPa (118 ksi) and a tensile strength of 1,200 MPa (174 ksi) — stronger than 85% of nickel alloy grades. Elongation at break is 25% and the elastic modulus is 214 GPa (31 Msi).
Thermal6
Inconel X-750 is rated for continuous service to 704°C (1,299 °F). It conducts heat at 12 W/m·K (6.93 BTU/hr·ft·°F), better than 65% of nickel alloy grades. Thermal expansion is 12.6 µm/m·K (7 µin/in·°F).
Electrical3
Inconel X-750 conducts electricity at 1.4 % IACS, worse than 65% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (80/100), better than 61% of nickel alloy grades.
Sustainability4
Producing a kilogram of Inconel X-750 takes about 190 MJ of energy and emits 13 kg of CO₂ — more than 75% of nickel alloy grades. Typical recycled content is 35%.
Manufacturability8
Inconel X-750's machinability is poor (15/100, worse than 76% of nickel alloy grades); weldability fair (40/100); formability poor (30/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the nickel alloy family
Yield strength against density for every nickel alloy grade FabDigit runs. Inconel X-750 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Inconel X-750
Is Inconel X-750 easy to machine?
Machine preferably in the annealed state with rigid setups, positive-rake carbide or ceramic tooling, low speed / heavy feed and flood coolant; aged material work-hardens sharply and needs sharp edges and no dwelling.
Can Inconel X-750 be welded?
GTAW with matching X-750 or Inconel 718/A-type filler; weld in the annealed condition, keep heat input low and re-solution-treat before ageing to avoid strain-age (post-weld heat treatment) cracking.
Can Inconel X-750 be formed, bent or molded?
Cold form only in the annealed or equalized condition — springback is large and forces are ~2× those for stainless; hot work at 1150–950 °C and re-anneal after heavy deformation.
Inconel X-750 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Cr | 14 – 17 | 15.5 |
| Fe | 5 – 9 | 7 |
| Tiγ′ former | 2.25 – 2.75 | 2.5 |
| Alγ′ former | 0.4 – 1 | 0.7 |
| NbNb + Ta | 0.7 – 1.2 | 0.95 |
| Co | ≤ 1 | 0.2 |
| Mn | ≤ 1 | 0.3 |
| Si | ≤ 0.5 | 0.2 |
| Cu | ≤ 0.5 | 0.05 |
| C | ≤ 0.08 | 0.04 |
| S | ≤ 0.01 | 0 |
| NiNi + Co, balance | ≥ 70 (balance) |
What surface finishes work on Inconel X-750?
Not anodizable; use pickling/passivation, electropolishing, glass-bead or vapour blast, and vacuum heat treatment for bright surfaces; oxide films from ageing must be removed before brazing or plating.
Surface treatments FabDigit runs on nickel alloy parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Plating
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Nickel Alloy Inconel X-750 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- N07750
- EN / DIN / Werkstoff-Nr.
- 2.4669NiCr15Fe7TiAl
- Other
- 5542
How much does Inconel X-750 cost?
Inconel X-750 is a high-cost nickel alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Inconel X-750 — frequently asked
What is Inconel X-750 used for?
Inconel X-750 is typically used for gas turbine blades and bolts, springs at elevated temperature, jet engine seals and nuclear reactor springs. In short: hot spring-temper superalloy; γ′ strength to 704 °C; stronger than 600 series nickel.
What is the yield strength of Inconel X-750?
Inconel X-750 has a typical yield strength of 815 MPa (118 ksi) and a tensile strength of 1,200 MPa (174 ksi) — stronger than 85% of nickel alloy grades. Strength varies by condition: see the 7 listed tempers.
Is Inconel X-750 easy to machine?
Not especially — machinability is rated poor (15/100, worse than 76% of nickel alloy grades). Machine preferably in the annealed state with rigid setups, positive-rake carbide or ceramic tooling, low speed / heavy feed and flood coolant; aged material work-hardens sharply and needs sharp edges and no dwelling.
Can Inconel X-750 be welded?
With care — weldability is rated fair (40/100). GTAW with matching X-750 or Inconel 718/A-type filler; weld in the annealed condition, keep heat input low and re-solution-treat before ageing to avoid strain-age (post-weld heat treatment) cracking.
What surface finishes work on Inconel X-750?
Not anodizable; use pickling/passivation, electropolishing, glass-bead or vapour blast, and vacuum heat treatment for bright surfaces; oxide films from ageing must be removed before brazing or plating.
Can Inconel X-750 be formed, bent or molded?
Cold form only in the annealed or equalized condition — springback is large and forces are ~2× those for stainless; hot work at 1150–950 °C and re-anneal after heavy deformation.
What is the maximum service temperature of Inconel X-750?
Inconel X-750 is rated for continuous use to about 704°C (1,299 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Inconel X-750-STA and Inconel X-750-ANN?
STA is the default condition — standard turbine/aerospace condition (AMS 5667 bar): best balance of RT strength, creep-rupture and stress-relaxation resistance to ~700 °C. ANN: softest, most formable and weldable condition; used as supply state for forming, deep drawing and machining before ageing. Yield strength is 815 MPa in STA versus 350 MPa in ANN.
How much does Inconel X-750 cost?
Inconel X-750 is a high-cost nickel alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- INCONEL alloy X-750 technical bulletin — Special Metals Corporation (2004)
- AMS 5542 — Nickel Alloy Sheet, Strip and Plate, Precipitation Heat Treatable — SAE International (2018)
- AMS 5667/5668/5670/5671 — Nickel Alloy Bars, Forgings and Rings (N07750) — SAE International (2017)
- ASTM B637 — Precipitation-Hardening Nickel Alloy Bars, Forgings and Forging Stock for High-Temperature Service — ASTM International (2018)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- GB/T 14992 / GH4145 — SAC (2005)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.