Alloy 77，Nilomag 77 Fittings，,E FORU

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

### **Product Datasheet: Alloy 77 / Nilomag 77 Pipe & Tube Fittings** **Alloy 77** (also known as **Nilomag 77**) is a renowned nickel-chromium-iron alloy engineered for exceptional resistance to oxidation, carburization, and thermal cycling. **Alloy 77 Fittings** are precision-manufactured components designed to connect Alloy 77 piping and tubing in complex high-temperature systems. They ensure system integrity, reliability, and longevity by matching the superior performance of the parent pipe or tube in the most demanding thermal environments. This datasheet provides detailed information on forged and machined fittings for use in corrosive and high-temperature applications. --- #### **1. Chemical Composition (Typical % by Weight)** The chemical composition of the raw material used for fittings is strictly controlled to guarantee consistent performance and weldability. | Element | Content (%) | | :--- | :--- | | Nickel (Ni) | Balance (~76.0 min) | | Chromium (Cr) | 14.0 - 17.0 | | Iron (Fe) | 6.0 - 17.0 | | Manganese (Mn) | 1.0 max | | Copper (Cu) | 0.20 max | | Silicon (Si) | 0.20 - 0.60 | | Carbon (C) | 0.10 max | | Sulfur (S) | 0.015 max | --- #### **2. Key Physical & Mechanical Properties** Alloy 77 Fittings inherit their robust mechanical and physical properties from the base alloy, ensuring they can withstand system pressures and thermal stresses. **Physical Properties:** * **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 (Typical for Annealed Material):** * **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** Alloy 77 Fittings are critical for constructing and maintaining piping systems that operate under high thermal and corrosive stress. * **Industrial Furnace Piping:** Connecting radiant tubes, charge tubes, and cooling systems in carburizing, annealing, and brazing furnaces. * **Heat Treatment System Manifolds:** Used in complex networks for distributing and controlling atmosphere gases. * **Thermal Oil & Heat Transfer Fluid Systems:** Forged fittings for high-temperature organic and synthetic fluid circuits. * **Power Generation Systems:** Components within heat recovery steam generators (HRSG) and high-temperature boiler systems. * **Chemical Processing:** Fittings for handling aggressive process streams at elevated temperatures. * **Exhaust & Flue Gas Ducting:** Connecting sections of high-temperature corrosion-resistant ducting. --- #### **4. International Standards & Specifications** While fittings are manufactured to dimensional standards, the material itself conforms to wrought alloy specifications. **Material Standards:** * **ASTM B366 / ASME SB366:** Specification for Factory-Made Wrought Nickel and Nickel Alloy Fittings. * **ASTM B564 / ASME SB564:** Specification for Nickel Alloy Forgings (applies to forged fittings). * **ASTM B168 / ASME SB168:** Specification for Nickel-Chromium-Iron Alloy (UNS N06003) Plate, Sheet, and Strip (as the base material reference). **Dimensional Standards (Examples):** * **ASME B16.9 / B16.11 / MSS SP-43:** For dimensions of butt-weld, socket-weld, and threaded fittings. * **UNS Number:** **N06003** * **DIN Material Number:** **2.4631** (NiCr15Fe) --- #### **5. Key Advantages of Alloy 77 Fittings** * **Seamless System Integration:** Perfectly matched metallurgy and performance to Alloy 77 pipes and tubes, ensuring uniform corrosion resistance and thermal expansion. * **Superior High-Temperature Strength:** Resist creep, deformation, and cracking under continuous load at temperatures up to 1150°C (2100°F). * **Excellent Weldability:** Can be readily joined to matching Alloy 77 piping using TIG, MIG, or other suitable welding techniques, creating homogeneous, high-integrity joints. * **Outstanding Oxidation & Carburization Resistance:** Provide long service life without failure in aggressive furnace atmospheres, reducing maintenance downtime. * **Robust Construction:** Manufactured through forging and precision machining to ensure dimensional accuracy and freedom from defects, capable of withstanding system pressure and thermal shock. **Conclusion:** Alloy 77 (Nilomag 77) Fittings are a critical investment in the reliability and safety of high-temperature fluid and gas handling systems. By providing robust, high-performance connection points, they ensure the entire piping system delivers the longevity and corrosion resistance that the base alloy is famous for. --- **For detailed information on fitting types (elbows, tees, reducers), available sizes, pressure ratings, and welding procedure specifications, please contact our engineering department.**

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 2789 gallon liquid totes Special package is available on request.