Inconel X-750 Alloy
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Inconel X-750 description
GNEE Inconel X-750 Alloy
Inconel X-750 is a precipitation-hardenable nickel-chromium superalloy with a typical composition of ≥70% nickel and 14–17% chromium (with the balance being iron), utilizing titanium and aluminum additions to achieve age hardening. It operates across a temperature range from cryogenic levels up to 816°C (1500°F), maintaining excellent strength below 700°C (1300°F) and retaining useful strength and creep-rupture resistance up to 816°C, while also preserving excellent ductility and mechanical integrity at low temperatures. It offers resistance to chemical corrosion, oxidation, and chloride-ion stress corrosion cracking. Welding is typically performed using Gas Tungsten Arc Welding (GTAW) with Inconel 718 filler metal; cold forming should be carried out in the annealed condition, and the material requires solution annealing prior to welding, followed by appropriate post-weld heat treatment to prevent strain-age cracking.
Inconel X-750 Available Shape
Inconel X-750 Seamless Pipe
Inconel X-750 Plate
Inconel X-750 Bar
Inconel X-750 Pipe Fitting
Global Equivalent Designations for Inconel X-750 Alloy
| Standard / Region | Grade Designation |
|---|---|
| US Unified Numbering System | UNS N07750 |
| German / European Designation | W.Nr 2.4669 |
| Chinese Equivalent Grade | GH4145 |
| International Nominal Composition | NiCr15Fe7TiAl |
Key Industry Standards for Inconel X-750 Alloy
| Product Form / Industry | Applicable Standard |
|---|---|
| Plates & Strips | ASTM B168 / ASME SB168 |
| Bars & Forgings | ASTM B637 |
| Tubes & Pipes | ASTM B163 |
| Aviation Special Standards | AMS 5542, AMS 5667, AMS 5841 |
| Nuclear Industry Standard | Nuclear Grade Special Technical Agreement |
Alloy X-750 Specification
Inconel Alloy X-750 Chemical Composition
|
Chemical Element |
ASTM Standard Range (wt%) |
Export Internal Control (wt%) |
Industrial Technical Function |
|---|---|---|---|
|
Ni |
≥70.0 |
70.5~73.0 |
Stable austenite matrix, resist high temperature phase transformation and stress corrosion |
|
Cr |
14.0~17.0 |
14.5~16.5 |
Form dense protective film, improve high temperature oxidation and corrosion resistance |
|
Fe |
5.0~9.0 |
6.0~8.5 |
Balance alloy toughness, improve processability and fatigue resistance |
|
Ti |
2.25~2.75 |
2.3~2.7 |
Core precipitation strengthening element, form high-temperature stable strengthening phase |
|
Al |
0.40~1.00 |
0.5~0.9 |
Cooperate with titanium to improve aging hardening effect and high-temperature creep resistance |
|
Nb |
0.70~1.20 |
0.8~1.1 |
Refine grains, inhibit carbide precipitation, improve structural stability |
|
C |
≤0.08 |
≤0.05 |
Ultra-low carbon control to avoid high-temperature grain boundary precipitation brittleness |
|
S / P |
≤0.010 |
≤0.003 |
Strict impurity control to eliminate microcracks in high-frequency fatigue working conditions |
Comparison of Mechanical Properties of Inconel X-750 Alloy in Different Heat-Treated Conditions
|
Heat Treatment State |
Tensile Strength |
Yield Strength (0.2%) |
Elongation |
Hardness |
|---|---|---|---|---|
|
Solution Annealed |
≥750MPa |
≥300MPa |
≥40% |
≤240HB |
|
Aging Hardened |
≥1100MPa |
≥800MPa |
≥20% |
300~350HB |
Key Performance Characteristics of Inconel X-750 in Industrial Applications
- High-Temperature Creep Resistance: Withstands continuous creep conditions at 820°C without plastic deformation under long-term loads; ideal for core components in gas turbines and high-temperature power equipment.
- Extreme High-Temperature Capability: Short-term oxidation resistance up to 980°C; strength in the medium-to-high temperature range far exceeds that of Inconel 600/625 alloys.
- Fatigue Resistance: Excellent service life under high-frequency alternating vibration and resistance to stress relaxation; the material of choice for high-end high-temperature springs, seals, and fasteners.
- Broad Temperature Adaptability: Combines cryogenic toughness with high-temperature stability; remains stable without embrittlement or failure across the -196°C to 800°C range.
- Corrosion Resistance: Resistant to atmospheric oxidation, high-temperature flue gas, and mild acid/alkali media; exhibits excellent resistance to stress corrosion cracking.
- Basic Physical Properties: Density of 8.28 g/cm³, melting point of 1390–1430°C, non-magnetic, low thermal expansion coefficient, and minimal deformation at high temperatures.
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X-750 alloy performance in corrosive environments
High-Temperature Tensile (Typical – Bar, Aged Condition)
| Temperature (°F) | Temperature (°C) | UTS (ksi) | UTS (MPa) | YS (ksi) | YS (MPa) | Elongation (%) | Source |
|---|---|---|---|---|---|---|---|
| 70 | 20 | 162 | 1117 | 92 | 634 | 24 | |
| 600 | 316 | 154 | 1062 | 88 | 607 | 28 | |
| 1000 | 538 | 140 | 965 | 84 | 579 | 22 | |
| 1200 | 649 | 120 | 827 | 82 | 565 | 9 | |
| 1350 | 732 | 92 | 634 | 74 | 510 | 7 | |
| 1500 | 816 | 52 | 359 | 44 | 303 | 22 |
Creep Rupture Strength (1000 hours)
| Temperature | Creep Rupture Strength (ksi) | Creep Rupture Strength (MPa) | Source |
|---|---|---|---|
| 1000°F (538°C) | 110 | 758 | |
| 1200°F (649°C) | 80 | 552 | |
| 1350°F (732°C) | 50 | 345 | |
| 1500°F (816°C) | 28 | 193 |
inconel X-750 Dimensional Specifications
inconel X-750 Bar / Rod
| Type | Diameter Range | Length | Surface Condition |
|---|---|---|---|
| Hot‑Rolled Round Bar | Φ5.5 – 150 mm (small sizes); Φ20 – 50 mm | L 1000 – 5000 mm | Black / as‑rolled |
| Forged Round Bar | Φ30 – 600 mm | L 1000 – 4000 mm | Black / turned bright |
| Cold‑Drawn Round Bar | Φ1 – 60 mm (standard Φ4 – 20 mm) | L 1000 – 5000 mm | Bright surface, high dimensional precision |
| Cold‑Heading Round Bar | Φ30 – 45 mm | - | Black / as‑rolled billet |
inconel X-750 Plate / Sheet
| Type | Thickness (mm) | Width (mm) | Length (mm) | Thickness Tolerance |
|---|---|---|---|---|
| Cold‑Rolled Sheet | 0.8 – 6.0 | 300 – 1500 | ≤ 8000 | ±0.1 mm |
| Hot‑Rolled Plate | 4.5 – 100 | 650 – 2400 | ≤ 16000 | ±0.5 mm |
| Strip / Coil | 0.05 – 5.0 | 10 – 420 | Coil form | - |
inconel X-750 seamless Tube / Pipe
| Type | Outer Diameter Range | Wall Thickness Range | Remarks |
|---|---|---|---|
| Small‑Diameter Seamless Tube | Φ3 – 114 mm | 0.5 – 6 mm | Full range of small diameters available |
| Large‑Diameter Seamless Tube | Φ6 – 426 mm | 0.4 – 30 mm | Quick delivery available |
| Welded Tube | Custom per customer requirements | Custom per customer requirements | Made‑to‑order |
Contact us to customize Inconel X-750 products to fit your project dimensions
Inconel X-750 Industry Applications
Inconel X-750 is a high-end, functional nickel-based alloy. It is not intended for general-purpose applications-such as standard chemical corrosion resistance or conventional heat exchange-but is instead focused on high-end industrial sectors that demand high precision, high reliability, and long service life:
| Industry | Typical Applications |
|---|---|
| Aerospace Industry | Aero‑engine high‑temperature seals, turbine frame fasteners, airborne high‑temperature springs, precision components for space propulsion systems |
| Nuclear Power & Energy Industry | Nuclear reactor internal fasteners, high‑temperature sealing assemblies, nuclear‑grade fatigue‑resistant structural components, core power equipment parts |
| Gas Turbines & Power Equipment | Industrial gas turbine hot‑section components, engine exhaust assemblies, high‑temperature creep‑resistant load‑bearing members |
| High‑End Precision Manufacturing | High‑temperature precision springs, fasteners for high‑temperature service, high‑pressure elastic seals, precision parts for cyclic loading conditions |
| High‑End Oilfield Equipment | Elastic components for deep‑well high‑temperature oil & gas equipment, high‑temperature / high‑pressure wellhead fatigue‑resistant parts |
Inconel X-750 Nondestructive Testing (NDT) Requirements
| Test Method | Requirement | Standard | Acceptance Criteria |
|---|---|---|---|
| Ultrasonic Testing (UT) | As specified (100% for aviation) | ASTM E2375 | No defects exceeding 0.8mm |
| Eddy Current Testing (ET) | As specified (100% for tubes) | ASTM E426 | No relevant indications |
| Hydrostatic Test | 100% (tubes/pressure parts) | ASTM B444 | No leakage |
| Liquid Penetrant Inspection (LPI) | As specified | ASTM E1417 | No relevant indications |
| Visual Inspection | 100% | - | No surface defects |
Selection Differences: Inconel X-750 vs. Other Key Nickel-Based Alloys
| Alloy | Type / Strengthening Mechanism | Core Strengths | Primary Applications | Limitations |
|---|---|---|---|---|
| Inconel X‑750 | Precipitation‑hardening (Age‑hardening) | High‑temperature high strength, creep resistance, fatigue resistance, stress relaxation resistance | Dynamic high‑temperature conditions: springs, fasteners, turbine components, nuclear components | Lower cost‑effectiveness for static corrosion protection applications |
| Inconel 600 | Solid‑solution strengthening (Temperature‑resistant) | High‑temperature oxidation resistance; no age‑hardening effect; moderate strength at both ambient and high temperatures | Static high‑temperature heat exchange, furnace components | Unable to withstand high‑frequency vibration or long‑term creep loads |
| Inconel 625 | Solid‑solution strengthening (Corrosion‑resistant) | Excellent corrosion resistance; balanced overall performance; no age‑hardening effect | Aggressive corrosion service conditions | Prone to deformation under high‑temperature dynamic loads; shorter fatigue life; not a substitute for X‑750 in demanding dynamic high‑temperature applications |
Contact our experts to recommend the right alloy for your project
About Gnee Alloy
For high-end overseas equipment, aerospace, nuclear power, and energy/propulsion projects, we offer one-on-one technical matching based on operating conditions, customized heat treatment processes, and guidance on grade selection. We supply materials across all grades-industrial, aerospace, and nuclear-accompanied by full documentation, including AMS and ASTM standard compliance and third-party inspection certifications, ensuring suitability for global project acceptance and long-term partnerships.
We provide precise technical solutions and export quotations-including support for technical parameter benchmarking, feasibility analysis of operating conditions, and sample testing-and can accommodate global framework orders and customized component supply for high-end equipment.
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Gnee Alloy Inconel X-750 certificate
FAQ
Q1: What are the core advantages of Inconel X-750, and for what unique operating conditions is it suitable?
A: Its core advantages include ultra-high strength via age-hardening, excellent high-temperature creep resistance, resistance to stress relaxation, and high-frequency fatigue resistance. It is one of the few nickel alloys capable of stable, long-term service under dynamic loads at temperatures up to 800°C. It is specifically suited for high-temperature springs, fasteners, turbine components, and dynamic parts in nuclear power applications, making it an essential specialty alloy for high-temperature, dynamic operating environments.
Q2: Does X-750 require heat treatment? How should one choose between the two available conditions?
A: Yes, it does. The solution-annealed condition is suitable for bending, stamping, and deep-forming operations; the age-hardened condition is suitable for high-strength structural components and wear/fatigue-resistant parts intended for direct use. These represent the standard selection criteria in the industry.
Q3: What advantages does X-750 offer over ordinary nickel alloys regarding its maximum operating temperature?
A: While the strength of conventional alloys (such as 600 or 625) drops significantly above 600°C, X-750 maintains stable creep performance during long-term service at 820°C and can withstand short-term temperatures up to 980°C. Its high-temperature structural stability far surpasses that of general-purpose nickel alloys.
Q4: What are the welding characteristics of X-750? Is post-weld heat treatment required?
A: It has good weldability, though welding reduces local strength gained from aging. For critical load-bearing components, re-aging after welding is recommended to ensure consistent fatigue and creep performance across the entire structure.
Q5: Is X-750 corrosion-resistant? Can it be used in highly corrosive environments?
A: It offers excellent resistance to high-temperature oxidation and mildly corrosive media. However, as it lacks high molybdenum content, its resistance to strong acids, alkalis, and chloride-induced corrosion is inferior to that of Alloy 625; therefore, it is not recommended for static, highly corrosive applications.
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