Inconel X-750 Gh4145 N07750 Nc15tnba Nickel Alloy Bar Rod
Inconel X-750 (international designations include UNS N07750, W.Nr. 2.4669, GB GH4145, AFNOR NC15TNBa, and NiCr15Fe7TiAl) is a precipitation-hardenable nickel-chromium superalloy. Its chemical composition consists of approximately 70% nickel plus cobalt, 15% chromium, and 7% iron, with titanium and aluminum additions to enable age hardening; the material is essentially non-magnetic.
Its operating temperature range extends from cryogenic levels up to 700°C–980°C. Specific creep-rupture strength depends on the heat treatment regimen, and the alloy exhibits outstanding relaxation resistance in high-temperature fasteners and springs operating below 650°C.
Typical applications for bar stock include gas turbines (rotor blades, impellers, turbine bolts, structural components), fasteners and springs (high-temperature screws and springs for service up to 650°C), aerospace components (airframe parts, hot-air ducting systems, rocket engine thrust chambers), and industrial tooling (pressure vessels, extrusion dies, heat-treatment fixtures).
Inconel X-750 Full Grade Standards
| Parameter | Specification / Details |
|---|---|
| China Standard | GH4145 (GH145), per GB/T 14992 |
| US Standards | Inconel X‑750, UNS N07750, per ASTM B637, AMS 5698 |
| European Standards | NC15TNBA, W.Nr 2.4669 |
| Core Positioning | Precipitation‑hardening nickel‑based alloy bar; although it does not possess the static high‑temperature oxidation resistance of solid‑solution strengthened alloys, it offers excellent medium‑temperature creep resistance and stress relaxation resistance; specifically designed for load‑bearing precision components operating below 700°C |
Chemical Composition of Inconel X-750 Alloy
|
Element |
ASTM B637 Standard Range (%) |
GNEE Export Bar Locked Range (%) |
Procurement Risk of Unqualified Materials |
|---|---|---|---|
|
Ni |
≥70.0 |
71.0~74.0 |
Insufficient nickel reduces medium-temperature structural stability |
|
Cr |
14.0~17.0 |
14.5~16.5 |
Low chromium leads to high-temperature oxidation peeling |
|
Fe |
5.0~9.0 |
6.0~8.0 |
Excess iron weakens stress relaxation performance |
|
Ti |
2.25~2.75 |
2.30~2.70 |
Unqualified titanium affects precipitation hardening effect |
|
Al |
0.40~1.00 |
0.50~0.90 |
Al-Ti ratio imbalance causes insufficient aging strength |
|
C |
≤0.08 |
≤0.05 |
High carbon induces grain boundary cracks under high load |
|
S/P |
≤0.015 |
≤0.010 |
Excess impurities cause bar forging and processing cracks |
GH4145 Bar Mechanical Properties (Solution + Aging Export Standard)escription
Global industrial and aerospace export orders uniformly adopt solution treatment + two-stage aging process (980℃ solution + 720℃/620℃ aging), which is the core standard to reach rated strength. Data below are all finished bar test values, suitable for buyer incoming inspection.
|
Test Condition |
Tensile Strength (MPa) |
Yield Strength (MPa) |
Elongation (%) |
Hardness (HRC) |
Core Application Scenario |
|---|---|---|---|---|---|
|
Room Temperature (Aged) |
≥1200 |
≥1000 |
≥15 |
38~42 |
Precision fastener, structural blank |
|
540℃ Medium Temperature |
≥900 |
≥780 |
≥18 |
35~40 |
High-temperature spring, pressure-resistant parts |
|
700℃ Limit Working Temp |
≥650 |
≥550 |
≥22 |
30~35 |
Aerospace auxiliary load-bearing parts |
Key Physical Parameters for Export Inspection: Density 8.25g/cm³, melting range 1390~1430℃, non-magnetic, maximum oxidation resistance temperature 982℃, stable stress relaxation performance below 540℃ (core advantage superior to other nickel alloys).
Inconel X-750 Bar: Export Size Specifications and Surface Standards
The full size range complies with ASTM B637 export tolerance standards, supporting global OEM customization; the product line focuses exclusively on bars, excluding plate or tubing specifications.
Comprehensive Size Range
| Product Category | Diameter Range | Dimensional Tolerance | Typical Applications |
|---|---|---|---|
| Small Precision Bars | Φ3 mm – Φ50 mm | h8 / h9 precision tolerances | Fasteners and springs |
| Medium Industrial Bars | Φ50 mm – Φ200 mm | h10 tolerance | Mechanical structural component blanks |
| Large Forged Bars | Φ200 mm – Φ450 mm | Custom forged billets | Heavy‑duty high‑temperature components |
| Length Options | 2000 mm – 6000 mm (standard) | Supports fixed‑length cutting and zero‑tolerance precision finishing | All above categories |
Three Export Surface Conditions
| Surface Finish | Key Features | Typical Applications / Buyer Profile |
|---|---|---|
| Black Forged / Rolled | Low cost; suitable for secondary processing of general industrial parts | Mainstream choice for civil industrial orders from Southeast Asia and the Middle East |
| Peeled Bright (Ra ≤ 1.6 μm) | Removes surface decarburization layer; requires no secondary polishing | Used for 70% of global bulk export orders |
| Centerless Ground Precision | Strict h8 / h9 tolerances | Suitable for precision component orders in the European and American aerospace and nuclear power sectors |
Gnee Alloy GH4145 Bar Production and Non-Destructive Testing
To address common quality issues associated with X-750/GH4145 bars intended for export-such as uneven age-hardening, internal micro-defects, and dimensional tolerance non-compliance-we employ a standardized production and comprehensive inspection system. This ensures our products pass all inbound quality checks required by overseas customers.
Production Process Flow
VIM (Vacuum Induction Melting) → High-temperature Forging/Rolling → Precision Sizing → Standard Solution & Aging Heat Treatment → Straightening → Surface Finishing → Comprehensive NDT (Non-Destructive Testing) → Custom Cutting → Export-Standard Packaging
Export-Grade NDT Standards
100% Ultrasonic Testing (UT) (Detection of internal cracks and shrinkage defects)
100% PMI Material Composition Analysis (Ensuring batch composition traceability)
Batch-wide Hardness Sampling (Ensuring uniform aging performance)
Full Dimensional Tolerance Inspection (Compliance with ASTM export tolerance standards)
Key Application Scenarios for Inconel X-750
Characterized by high strength at moderate temperatures and excellent resistance to stress relaxation, this material is specifically used for load-bearing and elastic components in high-temperature, corrosive environments:
| Industry | Typical Applications |
|---|---|
| Aerospace | High‑temperature fasteners and sealing structural components for aero‑engines |
| Nuclear Power | Medium‑temperature elastic springs and pressure‑resistant blank components for nuclear equipment |
| Oil & Gas | Medium‑temperature load‑bearing components and corrosion‑resistant fasteners for downhole applications |
| Industrial Gas Turbines | Hot‑section structural components and high‑temperature fixture blanks |
| Automotive | High‑temperature precision components for automotive engines |
Why Choose Gnee as Your Nickel-Based Alloy Supplier
✅ Over 18 years of export experience, products sold to more than 80 countries
✅ Certified by ISO, SGS, and BV
✅ Global inventory of Inconel, Hastelloy, Incoloy, and Monel alloy tubing, plates, and bars
✅ Custom processing services available – including cutting, polishing, CNC machining, and packaging
✅ Fast delivery within 7-15 days, supported by global logistics partners
Gnee Alloy Inconel 625 Certificate
Click to view our professional certifications for Inconel 625 alloy
📦 Packaging and Shipping
All Nickel Based Alloy products are packaged using the following methods:
Wooden pallets or crates
Moisture-proof packaging
Labels with furnace number, standard, and size labels
Shipped worldwide by sea, air, or express
Gnee Alloy Alloy 625 Product Packing
Contact us to select your preferred packaging and shipping method
⚒️Gnee Alloy Production Line Equipment and Product Testing
Contact us for the latest export price quote for 625 Alloy
About Gnee Alloy
To receive an accurate official export quote (response within 1 hour), please provide the following key specifications:
Bar Specifications: Diameter, length, tolerance requirements, surface finish
Operating Conditions: Service temperature, application scenario (aerospace, nuclear power, oil & gas, or general industry)
Order Type: Bulk stock order / Custom fabrication / Sample order
Certification Requirements: 3.1/3.2 Material Test Certificate (MTC), third-party inspection, or equivalent regional certification
Dedicated Export Services: Free small samples (buyer pays shipping), free drawing review, custom cutting and precision machining, end-to-end logistics tracking, and professional export-grade packaging.
FAQ
Q1: Are Inconel X-750, GH4145, N07750, NC15TNBA completely equivalent?
Yes. The four names are only regional standard aliases, with consistent chemical composition, mechanical properties and production standards, fully interchangeable in global procurement and engineering applications, and can pass international tender and customs audit.
Q2: What is the maximum safe working temperature of X-750 nickel alloy bar?
Long-term stable service temperature ≤700℃; excellent stress relaxation performance below 540℃ (core advantage for spring and fastener applications); oxidation resistance up to 982℃, suitable for intermittent high-temperature working environments.
Q3: Why must export bars adopt aging heat treatment?
X-750/GH4145 is a precipitation-hardened alloy. Only after solution + dual aging treatment can it exert medium-temperature high strength and stable hardness. Non-aged soft bars are only suitable for rough machining and cannot be used for load-bearing finished parts.
Q4: What core documents can be provided for export?
EN10204 3.1 factory MTC (free), SGS/TUV 3.2 witnessed report (optional), full PMI spectral test report, UT/NDT flaw detection report, EU/Kazakhstan regional equivalent conformity certificate, supporting global customs clearance and supplier audit.
Q5: What is the delivery cycle for export orders?
Conventional stock bars: 7-15 working days; customized precision processing bars: 15-25 working days; customized vacuum smelting special batches: 30-45 working days, supporting urgent order priority production.
