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Technical Specifications
Product Overview
Metallurgical Characteristics
UNS N06686 is an austenitic nickel-chromium-molybdenum-tungsten super alloy specifically designed for superior corrosion resistance in highly aggressive environments. The alloy's exceptional performance stems from its high molybdenum and tungsten content, which provides outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking in chloride-containing environments.
Heat Treatment Process
MetalZenith employs precise solution annealing at 1150-1175°C followed by rapid cooling to achieve optimal corrosion resistance and mechanical properties. The heat treatment process eliminates carbide precipitation and ensures a homogeneous austenitic microstructure. Post-annealing descaling removes surface oxides to maximize corrosion performance.
Manufacturing Process Excellence
Our manufacturing process begins with vacuum induction melting (VIM) using premium raw materials, followed by vacuum arc remelting (VAR) for enhanced cleanliness and homogeneity. Hot working operations are performed within controlled temperature ranges to optimize grain structure. Cold working and intermediate annealing cycles ensure dimensional accuracy and surface quality.
Quality Standards & Testing
Every production lot undergoes comprehensive testing including chemical analysis by optical emission spectroscopy, mechanical property verification, intergranular corrosion testing per ASTM A262 Practice E, and critical pitting temperature evaluation. MetalZenith maintains full traceability from raw materials through final inspection, ensuring compliance with NACE MR0175/ISO 15156 for sour service applications.
Corrosion Performance
UNS N06686 demonstrates exceptional resistance to sulfuric acid, hydrochloric acid, phosphoric acid, and mixed acid environments. The alloy's high PREN (Pitting Resistance Equivalent Number) of approximately 65 ensures superior performance in seawater and chloride-containing solutions at elevated temperatures.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Nickel (Ni) | Balance |
| Chromium (Cr) | 19.0 - 23.0 |
| Molybdenum (Mo) | 15.0 - 17.0 |
| Tungsten (W) | 3.0 - 4.4 |
| Iron (Fe) | ≤ 5.0 |
| Carbon (C) | ≤ 0.010 |
| Manganese (Mn) | ≤ 0.75 |
| Silicon (Si) | ≤ 0.08 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.010 |
| Aluminum (Al) | ≤ 0.35 |
| Titanium (Ti) | ≤ 0.25 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength (Room Temperature) | ≥ 690 MPa |
| Yield Strength (0.2% Offset) | ≥ 310 MPa |
| Elongation in 50mm | ≥ 40% |
| Reduction of Area | ≥ 40% |
| Hardness (Brinell) | ≤ 250 HB |
| Hardness (Rockwell B) | ≤ 95 HRB |
| Impact Energy (Charpy V-notch, Room Temp) | ≥ 150 J |
| Fatigue Strength (10^7 cycles) | 275 MPa |
| Young's Modulus | 210 GPa |
| Shear Modulus | 81 GPa |
| Poisson's Ratio | 0.31 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 8.25 g/cm³ |
| Melting Point Range | 1325-1370°C |
| Thermal Conductivity (100°C) | 9.8 W/m·K |
| Thermal Conductivity (500°C) | 16.8 W/m·K |
| Thermal Expansion (20-100°C) | 12.4×10-6/K |
| Thermal Expansion (20-500°C) | 13.9×10-6/K |
| Specific Heat Capacity | 420 J/kg·K |
| Electrical Resistivity (20°C) | 1.24 µΩ·m |
| Magnetic Permeability | 1.002 (Essentially Non-magnetic) |
| Curie Temperature | Not Applicable |
📏 Product Specifications
| Specification | Available Options |
|---|---|
| Product Forms | Round Bar, Flat Bar, Plate, Sheet, Strip, Tube, Pipe, Wire, Forging Stock |
| Round Bar Diameter | 6mm - 300mm |
| Plate Thickness | 3mm - 100mm |
| Sheet Thickness | 0.5mm - 6mm |
| Tube Outer Diameter | 6mm - 219mm |
| Standards Compliance | ASTM B574, ASME SB-574, UNS N06686, DIN 2.4606 |
| Surface Finish | Hot Rolled, Cold Rolled, Bright Annealed, Pickled, Polished |
| Dimensional Tolerance | ASTM Standard or Custom Requirements |
| Length Options | Standard Lengths or Cut to Size |
| Heat Treatment Condition | Solution Annealed and Descaled |
Let Us Create Success for Your Project
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Our Advantages in Processing UNS N06686
Advanced Vacuum Melting Technology
MetalZenith employs state-of-the-art vacuum induction melting (VIM) and vacuum arc remelting (VAR) processes to produce UNS N06686 with superior chemical homogeneity, minimal inclusions, and exceptional metallurgical quality that exceeds industry standards.
Comprehensive Quality Control System
Our integrated quality management system features advanced spectroscopic analysis, mechanical testing laboratories, and corrosion testing facilities. Every batch receives full material certification with complete traceability and compliance to ASTM B574, ASME SB-574, and international standards.
Custom Processing & Global Supply
MetalZenith offers extensive customization capabilities including precision machining, heat treatment optimization, and specialized surface finishes. Our global distribution network ensures reliable delivery of UNS N06686 products worldwide with comprehensive technical support and engineering consultation.
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