NILOMAG Alloy 77,，1

### **Product Introduction: NILOMAG® Alloy 77** **NILOMAG® Alloy 77** is a specialized nickel-iron controlled-expansion alloy renowned for its exceptionally low and predictable thermal expansion characteristics. This precision-engineered material belongs to the NILOMAG series of alloys, specifically designed to provide outstanding dimensional stability across a wide temperature range. The alloy's unique thermal properties make it particularly valuable for applications requiring precise dimensional control and thermal compatibility with various materials under varying thermal conditions. Engineered to maintain consistent performance in critical environments, NILOMAG Alloy 77 offers excellent reliability in applications where thermal expansion mismatch could compromise system integrity or performance accuracy. --- ### **Chemical Composition** | Element | Content (%) | |---------|-------------| | **Nickel (Ni)** | 28.0 - 30.0 | | **Cobalt (Co)** | 16.0 - 18.0 | | **Iron (Fe)** | Balance | | **Manganese (Mn)** | 0.30 - 0.60 | | **Silicon (Si)** | 0.15 - 0.30 | | **Carbon (C)** | 0.05 max | | **Copper (Cu)** | 0.10 max | | **Chromium (Cr)** | 0.10 max | | **Aluminum (Al)** | 0.10 max | | **Sulfur (S)** | 0.015 max | | **Phosphorus (P)** | 0.015 max | --- ### **Physical Properties** | Property | Value | |----------|-------| | **Density** | 8.10 g/cm³ | | **Melting Point** | 1450 °C | | **Thermal Conductivity** | 12.5 W/m·K (at 20°C) | | **Electrical Resistivity** | 0.65 μΩ·m | | **Modulus of Elasticity** | 140 GPa | | **Mean Coefficient of Thermal Expansion** | 1.5 - 2.5 × 10⁻⁶/°C (20-300°C) | | **Specific Heat Capacity** | 480 J/kg·K | | **Magnetic Permeability** | <1.5 | --- ### **Mechanical Properties** **Annealed Condition:** - **Tensile Strength:** 480 - 580 MPa - **Yield Strength (0.2% Offset):** 250 - 320 MPa - **Elongation:** 30 - 40% - **Hardness:** 60 - 75 HRB **Cold Worked Condition:** - **Tensile Strength:** 580 - 750 MPa - **Yield Strength (0.2% Offset):** 420 - 580 MPa - **Elongation:** 15 - 25% - **Hardness:** 75 - 90 HRB --- ### **Heat Treatment** **Stress Relieving:** - **Temperature:** 350 - 450°C - **Time:** 1-2 hours - **Cooling:** Controlled cooling rate **Annealing:** - **Temperature:** 800 - 900°C - **Atmosphere:** Protective atmosphere required - **Cooling:** Controlled furnace cooling --- ### **Key Characteristics & Advantages** 1. **Ultra-Low Thermal Expansion** - Exceptionally low coefficient of thermal expansion - Predictable expansion behavior across temperature ranges - Superior dimensional stability 2. **Excellent Thermal Stability** - Consistent performance under thermal cycling - Minimal thermal hysteresis - Reliable long-term dimensional integrity 3. **Good Mechanical Properties** - Adequate strength for structural applications - Good manufacturability and formability - Suitable for precision machining 4. **Specialized Application Suitability** - Compatible with various optical and ceramic materials - Excellent for precision alignment applications - Reliable in vacuum and space environments --- ### **Product Applications** **Aerospace and Defense:** - Satellite structural components - Space telescope frameworks - Precision guidance systems - Aerospace instrument mounts **Scientific and Research:** - Laser system components - Optical bench systems - Scientific instrument frames - Metrology equipment **Electronics and Telecommunications:** - Microwave package components - RF communication devices - Precision electronic housings - Fiber optic alignment systems **Industrial Applications:** - Precision measurement equipment - Laboratory instrument frames - Temperature-sensitive mechanisms - High-precision manufacturing tools --- ### **International Standards** | Standard Type | Standard Number | Description | |---------------|-----------------|-------------| | **DIN** | 17745 | German Standard for Nickel-Iron Alloys | | **Werkstoff Nr.** | 1.3982 | Material Number | | **ASTM** | F30 | Alloy for Precision Applications | --- ### **Summary** **NILOMAG® Alloy 77** represents a premium controlled-expansion nickel-iron-cobalt alloy specifically engineered for applications demanding the highest level of dimensional stability. With its ultra-low thermal expansion coefficient and exceptional thermal stability, this alloy provides unmatched performance in precision instruments, aerospace systems, and scientific equipment where even minimal dimensional changes are unacceptable. The alloy's reliable behavior under thermal cycling conditions, combined with its good mechanical properties and manufacturing characteristics, makes it an essential material for critical applications in demanding environments. Certification to international standards including DIN 17745 and ASTM F30 ensures consistent quality and performance, providing engineers and designers with a trusted solution for the most challenging precision engineering applications requiring ultimate dimensional stability and thermal performance.

Packing of Standard Packing: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 3345 gallon liquid totes Special package is available on request.