Alloy 77，Nilomag 77 Other/Similar Specs，,E FORU

British Specs:，American Specs: AMS 6519 Bar, Tube, Forging，German Specs:

### **Product Datasheet: Alloy 77 / Nilomag 77 & Comparable Alloy Specifications** **Alloy 77** (also known under trade names like **Nilomag 77**) is a high-performance nickel-chromium-iron alloy designed for exceptional resistance to oxidation, carburization, and thermal cycling. It occupies a specific performance niche, and understanding its specifications relative to other common high-temperature alloys is crucial for optimal material selection. This datasheet provides a consolidated overview of Alloy 77's properties and places it in context with similar alloys like Alloy 600H (UNS N06601) and Alloy 601 (UNS N06601), highlighting the unique value proposition of Alloy 77. --- #### **1. Chemical Composition (Typical % by Weight) & Comparison** The composition of Alloy 77 is balanced for high nickel content and moderate chromium, which defines its specific high-temperature capabilities. | Element | Alloy 77 (Nilomag 77) | Similar Alloy 600H (UNS N06600) | Similar Alloy 601 (UNS N06601) | | :--- | :--- | :--- | :--- | | **Nickel (Ni)** | **Balance (~76.0 min)** | Balance (~72.0 min) | Balance (~60.0 min) | | **Chromium (Cr)** | **14.0 - 17.0** | 14.0 - 17.0 | 21.0 - 25.0 | | **Iron (Fe)** | **6.0 - 10.0** | 6.0 - 10.0 | Balance (Typ. 10-15%) | | **Aluminum (Al)** | - | - | 1.0 - 1.7 | | **Other** | - | - | - | **Key Differentiator:** Alloy 77's very high nickel content provides superior resistance to carburization and chloride stress corrosion cracking compared to many iron-nickel alloys. Its lower chromium than Alloy 601 makes it less ideal for highly sulfidizing environments but excellent for standard oxidizing and carburizing atmospheres. --- #### **2. Key Physical & Mechanical Properties** Alloy 77 maintains excellent strength and structural stability under high thermal loads. **Physical Properties (Alloy 77):** * **Density:** 8.26 g/cm³ (0.298 lb/in³) * **Melting Range:** ~1371°C - 1427°C (~2500°F - 2600°F) * **Thermal Conductivity:** 12.5 W/m·K (at 100°C) * **Mean Coefficient of Thermal Expansion (20-1000°C):** 16.0 x 10⁻⁶ /K **Mechanical Properties (Alloy 77 - Annealed Condition):** * **Tensile Strength:** 550 - 690 MPa (80 - 100 ksi) * **Yield Strength (0.2% Offset):** 240 MPa min (35 ksi min) * **Elongation (% in 2 inches):** 30% min * **Hardness (Rockwell B):** 65 - 85 HRB --- #### **3. Product Applications & Selection Context** The choice between Alloy 77 and its peers depends on the specific service environment. **Ideal Applications for Alloy 77:** * **Radiant Tubes:** Superior performance in carburizing and carbonitriding furnaces due to excellent carburization resistance. * **Annealing Furnace Components:** Muffles, retorts, and internal fixtures. * **Heat Treatment Baskets & Trays:** For long-life service in repeated thermal cycles. * **Chemical Processing Equipment:** Components handling caustic and high-purity environments. **When to Consider Alternatives:** * **For higher strength above 1000°C:** **Alloy 600H** or **Alloy 601** may offer better creep and rupture strength. * **For superior oxidation resistance above 1100°C:** **Alloy 601**, with its high chromium and aluminum content, forms a more stable protective scale. * **For sulfidizing environments:** Alloys with higher chromium (like **Alloy 601**) are generally preferred. --- #### **4. International Standards & Specifications** Alloy 77 is covered under various international standards, often under the unified UNS number N06003. Below is a summary of its common specifications across product forms. | Product Form | Common Standard (Alloy 77) | UNS Number | Comparable Alloy 600H/601 Standard | | :--- | :--- | :--- | :--- | | **Tube & Pipe** | ASTM B163 / ASTM B167 | **N06003** | ASTM B167 / B163 (UNS N06600/N06601) | | **Plate, Sheet & Strip** | ASTM B168 | **N06003** | ASTM B168 (UNS N06600/N06601) | | **Bar & Forgings** | ASTM B166 / ASTM B564 | **N06003** | ASTM B166 / B564 (UNS N06600/N06601) | | **Fittings** | ASTM B366 / ASTM B564 | **N06003** | ASTM B366 / B564 (UNS N06600/N06601) | | **European Standard** | DIN 17742 | **2.4631** | DIN 2.4816 (Alloy 600) / 2.4851 (Alloy 601) | --- #### **5. Key Advantages & Selection Summary** * **Superior Carburization Resistance:** Its high nickel content makes it the prime choice for carburizing and carbon-rich atmospheres. * **Excellent Oxidation Resistance:** Performs reliably in continuous service up to 1150°C (2100°F). * **Good Fabricability & Weldability:** Can be readily formed and joined using standard techniques for nickel alloys. * **Proven Longevity:** Offers an excellent balance of properties, leading to long service life and reduced total cost of ownership in its target applications. **Conclusion:** **Alloy 77 (Nilomag 77)** is a specialized, high-nickel alloy that excels in resisting carburization and oxidation. While alloys like **600H** and **601** offer advantages in specific areas like very high-temperature strength or superior sulfidation resistance, Alloy 77 remains the benchmark material for many industrial furnace applications, particularly in carburizing environments. Understanding these subtle differences is key to selecting the most cost-effective and reliable material for your specific high-temperature challenge. --- **For a detailed technical comparison and application-specific recommendation, please consult our metallurgical experts.**

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 2791 gallon liquid totes Special package is available on request.