UNS N07750 (Inconel X-750)
Generic Name & Other Designation
Inconel X-750, Alloy X750, Nickel Alloy X-750,W.Nr. 2.4669, NC15Ti (AFNOR)
Product Overview
UNS N07750 (famously known as Inconel X-750) is a precipitation-hardenable nickel-chromium alloy designed for applications requiring high creep-rupture strength, spring resilience, and oxidation resistance under high thermal stress.
Through controlled heat treatments (solution treating followed by single or double aging), UNS N07750 develops distinct mechanical profiles tailored for high-temperature springs, gas turbine bolts, or cryogenic seals.
Key Highlights
✅ High Relaxation Resistance: Exceptionally low stress-relaxation rates at elevated temperatures, maintaining elastic spring properties up to 700°C (1300°F).
✅ Precipitation Hardening via Titanium & Aluminum: Intermetallic gamma prime phase precipitation gives high creep-rupture strength up to 815°C (1500°F).
✅ Cryogenic Toughness: Retains excellent ductility and mechanical strength in sub-zero environments down to -196°C.
✅ Oxidation Resistance: Solid chromium addition grants effective resistance to high-temperature oxidation and industrial atmospheres.
Chemical Composition & Physical Properties
1. Chemical Composition (Weight %)
Element | Ni (+Co) | Cr | Fe | Ti | Al | Nb (+Ta) | Mn | Si | C |
Min (%) | 70.0 | 14.0 | 5.0 | 2.25 | 0.40 | 0.70 | — | — | — |
Max (%) | Bal. | 17.0 | 9.0 | 2.75 | 1.00 | 1.20 | 1.0 | 0.50 | 0.08 |
2. Mechanical Performance (Typical Spring / Aged Condition)
Parameter | Value / Standard (Typical Spring / Aged Condition) |
Density | 8.28 g/cm³ (0.299 lb/in³) |
Melting Range | 1390°C – 1430°C (2535°F – 2605°F) |
Tensile Strength (Rm) | 1100 – 1400 MPa (160 – 203 ksi, heat treatment dependent) |
Yield Strength (0.2%, Rp0.2) | ≥ 730 MPa (105 ksi) |
Elongation (A5) | ≥ 15% |
Available Forms & Specifications
BELNADE offers UNS N07750 in versatile forms for precision manufacturing:
Spring Wires & Flat Wires: AMS 5698 / AMS 5699; Diameter 0.5mm to 12mm for high-temp springs.
Round Bars & Centerless Rods: AMS 5667 / ASTM B637; 6mm to 200mm for turbine studs.
Strips & Thin Sheets: AMS 5542; Cold-rolled strips for diaphragms and seals.
Custom Fasteners: Studs, Belleville washers, and spring pins.
Typical Application Scenarios
High-Temperature Springs: Gas turbine seal springs, nuclear reactor springs, and safety valve springs.
Aerospace Gas Turbines: Turbine blades, rotor bolts, thrust reverser mechanisms, and rocket engine seals.
Nuclear Engineering: Control rod grid springs, fuel assembly hold-down springs, and reactor internal bolts.
Industrial Hardware: Extrusion dies for aluminum manufacturing and high-pressure expansion joints.
Quality Assurance & Verification
BELNADE maintains stringent quality standards for UNS N07750:
Full Material Test Reports (EN 10204 3.1)
Tensile, Hardness, and High-Temperature Stress Relaxation Verification
Microstructural Grain Size Analysis
Non-Destructive Eddy Current Testing on Wires
Supplier Profile: BELNADE
BELNADE supplies specialized nickel alloys, spring materials, and precision wires to aerospace, nuclear, and high-precision spring manufacturers globally.
Get in Touch with BELNADE for Quotes and Technical Inquiries
📧 Email: info@belnade-material.com
🌐 Website: www.belnade-material.com
💬 Mobile/ WhatsApp: +86 158-0040-6687