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Technical Specifications
Product Overview
Metallurgical Characteristics
UNS N08825 exhibits a stable austenitic microstructure with excellent resistance to chloride stress corrosion cracking and general corrosion in both oxidizing and reducing environments. The alloy's unique combination of nickel, chromium, molybdenum, and copper provides superior performance in sulfuric acid, phosphoric acid, and organic acid applications. The titanium addition stabilizes the alloy against carbide precipitation and enhances resistance to intergranular corrosion.
Heat Treatment Process
MetalZenith performs solution annealing at 980-1010°C followed by rapid cooling to achieve optimal corrosion resistance and mechanical properties. The standard heat treatment involves heating to 980°C minimum, holding for sufficient time to ensure complete dissolution of carbides, then water quenching or rapid air cooling. This process eliminates harmful precipitates and maximizes corrosion resistance while maintaining excellent ductility and toughness.
Manufacturing Process Excellence
Our advanced manufacturing process begins with vacuum induction melting using premium raw materials, followed by electroslag remelting for enhanced cleanliness. Hot working is performed within carefully controlled temperature ranges (1150-900°C) to optimize grain structure and mechanical properties. Cold working operations utilize precision equipment to achieve tight dimensional tolerances while maintaining material integrity.
Quality Standards & Testing
Every batch undergoes comprehensive testing including chemical analysis per ASTM E1019 and E1097, mechanical testing per ASTM A370, and specialized corrosion testing including ASTM A262 Practice E for intergranular corrosion susceptibility. Non-destructive testing includes ultrasonic examination per ASTM A388 and liquid penetrant testing per ASTM E165. MetalZenith maintains full traceability from raw materials through final inspection, ensuring complete compliance with nuclear, aerospace, and chemical processing industry requirements.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Nickel (Ni) | 38.0 - 46.0 |
| Chromium (Cr) | 19.5 - 23.5 |
| Iron (Fe) | Balance |
| Molybdenum (Mo) | 2.5 - 3.5 |
| Copper (Cu) | 1.5 - 3.0 |
| Titanium (Ti) | 0.6 - 1.2 |
| Carbon (C) | ≤ 0.05 |
| Manganese (Mn) | ≤ 1.0 |
| Silicon (Si) | ≤ 0.5 |
| Phosphorus (P) | ≤ 0.02 |
| Sulfur (S) | ≤ 0.03 |
| Aluminum (Al) | ≤ 0.2 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength (Room Temperature) | ≥ 586 MPa (85 ksi) |
| Yield Strength (0.2% Offset) | ≥ 241 MPa (35 ksi) |
| Elongation in 50mm | ≥ 30% |
| Hardness (Brinell) | ≤ 196 HB |
| Hardness (Rockwell B) | ≤ 90 HRB |
| Impact Energy (Charpy V-notch at 21°C) | ≥ 102 J (75 ft-lb) |
| Fatigue Strength (107 cycles) | 275 MPa |
| Young's Modulus | 196 GPa (28.4 × 106 psi) |
| Shear Modulus | 78 GPa |
| Poisson's Ratio | 0.31 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 8.14 g/cm³ (0.294 lb/in³) |
| Melting Point | 1370-1400°C (2500-2550°F) |
| Thermal Conductivity (21°C) | 9.6 W/m·K (5.5 Btu/hr·ft·°F) |
| Thermal Conductivity (100°C) | 11.9 W/m·K (6.9 Btu/hr·ft·°F) |
| Thermal Expansion (21-100°C) | 14.0×10-6/K (7.8×10-6/°F) |
| Thermal Expansion (21-538°C) | 15.7×10-6/K (8.7×10-6/°F) |
| Specific Heat (21°C) | 435 J/kg·K (0.104 Btu/lb·°F) |
| Electrical Resistivity (21°C) | 1.02 µΩ·m |
| Magnetic Permeability | 1.003 (Essentially Non-magnetic) |
| Curie Temperature | Below -196°C |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Round Bar, Flat Bar, Plate, Sheet, Strip, Pipe, Tube, Wire, Forging Stock |
| Round Bar Sizes | 6mm - 300mm diameter (× 3000mm length) |
| Plate Thickness | 3mm - 150mm |
| Sheet Thickness | 0.5mm - 6mm |
| Pipe/Tube Sizes | 6mm - 610mm OD, Wall thickness: 1mm - 50mm |
| ASTM Standards | B424, B425, B564, B704, B705, B751, B775, B829 |
| ASME Standards | SB-424, SB-425, SB-564, SB-704, SB-705 |
| EN Standards | EN 2.4858, EN 10216-5, EN 10217-7 |
| Surface Finish | Hot Rolled, Cold Rolled, Bright Annealed, Pickled, Polished |
| Dimensional Tolerance | ±0.1mm to ±0.5mm (depending on form and size) |
| Length Tolerance | +6mm/-0mm or as specified |
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Our Advantages in Processing UNS N08825
Advanced Vacuum Melting Technology
MetalZenith employs state-of-the-art vacuum induction melting (VIM) and electroslag remelting (ESR) processes to produce UNS N08825 with exceptional chemical homogeneity and minimal inclusion content. Our controlled atmosphere melting ensures optimal nickel, chromium, and molybdenum distribution for superior corrosion resistance and mechanical properties.
Comprehensive Quality Control Systems
Our integrated quality management system includes real-time spectroscopic analysis, advanced mechanical testing, and corrosion resistance verification. Every batch undergoes rigorous testing including intergranular corrosion testing per ASTM A262 and stress corrosion cracking evaluation to ensure consistent performance in aggressive environments.
Custom Processing & Global Supply Chain
MetalZenith offers extensive customization capabilities including precision machining, heat treatment optimization, and specialized surface treatments. Our global distribution network ensures reliable delivery of UNS N08825 in various forms including bars, plates, sheets, and custom-fabricated components with full traceability and certification documentation.
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