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Technical Specifications
Product Overview
Metallurgical Characteristics
UNS N07718 is a precipitation-hardening nickel-chromium superalloy strengthened by gamma prime (Ni&sub3;(Al,Ti)) and gamma double prime (Ni&sub3;Nb) precipitates. The unique combination of niobium and titanium additions provides exceptional strength retention at elevated temperatures up to 700°C, while chromium content ensures superior oxidation and corrosion resistance in aggressive environments.
Heat Treatment Process
MetalZenith employs a precise two-stage aging process following solution annealing at 980°C. The aging treatment consists of heating at 720°C for 8 hours, furnace cooling to 620°C, holding for 8 hours, then air cooling. This controlled precipitation sequence optimizes the formation of strengthening phases while maintaining ductility and toughness.
Manufacturing Process Excellence
Our integrated manufacturing process begins with vacuum induction melting (VIM) followed by vacuum arc remelting (VAR) or electroslag remelting (ESR) to ensure exceptional cleanliness and homogeneity. Hot working operations are performed within carefully controlled temperature ranges (1010-1180°C) to achieve optimal grain structure and mechanical properties. Cold working capabilities enable precise dimensional control and enhanced surface finish.
Quality Standards & Testing
Every production lot undergoes comprehensive testing including chemical analysis by optical emission spectroscopy, mechanical property verification through tensile and impact testing, and microstructural examination. Non-destructive testing methods including ultrasonic inspection, liquid penetrant testing, and magnetic particle inspection ensure internal soundness. Our quality management system complies with ISO 9001:2015, AS9100D, and NADCAP requirements, providing complete traceability from raw materials to finished products.
Technical Support & Engineering Services
MetalZenith provides comprehensive technical support including material selection guidance, heat treatment optimization, welding procedure development, and failure analysis services. Our metallurgical engineers work closely with customers to develop customized solutions for specific applications, ensuring optimal performance in demanding service conditions. Complete documentation packages include material certificates, test reports, and traceability records meeting aerospace and nuclear industry requirements.
🧪 Chemical Composition
| Element | Weight % |
|---|---|
| Nickel (Ni) | 50.0 - 55.0 |
| Chromium (Cr) | 17.0 - 21.0 |
| Iron (Fe) | Balance |
| Niobium + Tantalum (Nb+Ta) | 4.75 - 5.50 |
| Molybdenum (Mo) | 2.80 - 3.30 |
| Titanium (Ti) | 0.65 - 1.15 |
| Aluminum (Al) | 0.20 - 0.80 |
| Carbon (C) | ≤ 0.08 |
| Manganese (Mn) | ≤ 0.35 |
| Silicon (Si) | ≤ 0.35 |
| Phosphorus (P) | ≤ 0.015 |
| Sulfur (S) | ≤ 0.015 |
| Copper (Cu) | ≤ 0.30 |
| Cobalt (Co) | ≤ 1.00 |
| Boron (B) | ≤ 0.006 |
⚙️ Mechanical Properties
| Property | Value | Condition |
|---|---|---|
| Tensile Strength | ≥ 1275 MPa | Room Temperature |
| Yield Strength (0.2% Offset) | ≥ 1035 MPa | Room Temperature |
| Elongation | ≥ 12% | Room Temperature |
| Reduction of Area | ≥ 15% | Room Temperature |
| Hardness | 331-444 HB | Aged Condition |
| Impact Energy (Charpy V-notch) | ≥ 27 J | Room Temperature |
| Fatigue Strength (10&sup7; cycles) | 620 MPa | Room Temperature |
| Young's Modulus | 200 GPa | Room Temperature |
| Shear Modulus | 77 GPa | Room Temperature |
| Poisson's Ratio | 0.30 | Room Temperature |
| Tensile Strength at 650°C | ≥ 1035 MPa | High Temperature |
| Yield Strength at 650°C | ≥ 825 MPa | High Temperature |
🔬 Physical Properties
| Property | Value | Temperature |
|---|---|---|
| Density | 8.19 g/cm³ | 20°C |
| Melting Point | 1260-1336°C | - |
| Thermal Conductivity | 11.2 W/m·K | 20°C |
| Thermal Conductivity | 18.6 W/m·K | 650°C |
| Thermal Expansion Coefficient | 13.0×10-6/K | 20-100°C |
| Thermal Expansion Coefficient | 14.4×10-6/K | 20-650°C |
| Specific Heat Capacity | 435 J/kg·K | 20°C |
| Electrical Resistivity | 1.25 µΩ·m | 20°C |
| Magnetic Permeability | 1.0011 | Room Temperature |
| Curie Temperature | -112°C | - |
| Thermal Diffusivity | 3.15×10-6 m²/s | 20°C |
| Maximum Service Temperature | 700°C | Continuous |
📏 Product Specifications
| Specification | Available Options | Standards |
|---|---|---|
| Product Forms | Round bars, square bars, flat bars, plates, sheets, forgings, tubes, pipes | ASTM B637, AMS 5662/5663 |
| Round Bar Diameter | 6mm - 500mm | ASTM B637 |
| Square Bar Size | 10mm - 200mm | ASTM B637 |
| Plate Thickness | 3mm - 150mm | ASTM B670 |
| Sheet Thickness | 0.5mm - 6mm | ASTM B670 |
| Tube Outer Diameter | 6mm - 200mm | ASTM B983 |
| Surface Finish | Hot rolled, cold drawn, machined, polished, pickled | Per customer specification |
| Heat Treatment Condition | Solution annealed, aged, solution annealed + aged | AMS 5662/5663 |
| Dimensional Tolerance | ±0.1mm to ±3mm depending on size | ASTM standards |
| Length | Up to 12 meters (custom lengths available) | Customer specification |
| International Standards | ASTM, AMS, UNS, EN, DIN, JIS, GB | Multiple certifications |
| Testing Certificates | Mill test certificate, material certificate, inspection certificate | EN 10204 3.1/3.2 |
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Our Advantages in Processing UNS N07718
Advanced Vacuum Melting Technology
MetalZenith employs state-of-the-art vacuum induction melting (VIM) followed by vacuum arc remelting (VAR) processes, ensuring exceptional material purity, homogeneity, and elimination of inclusions. Our controlled atmosphere processing guarantees consistent chemical composition and superior metallurgical properties throughout the entire product range.
Precision Heat Treatment Capabilities
Our computer-controlled heat treatment facilities provide precise temperature and time control for optimal precipitation hardening of UNS N07718. Advanced furnace technology with uniform heating zones ensures consistent mechanical properties and microstructure development, meeting the most demanding aerospace and nuclear specifications.
Complete Supply Chain Integration
MetalZenith offers comprehensive customization services from raw material processing to finished components. Our integrated supply chain includes precision machining, surface treatments, and specialized packaging for critical applications. Global logistics network ensures timely delivery with full traceability documentation and certification packages.
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