Alloy 77，Nilomag 77 Tube，,E FORU

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

### **Product Introduction: Alloy 77 / Nilomag 77 Seamless Tubes** **Alloy 77** (also known under trade names like **Nilomag 77**) is a high-performance nickel-chromium-iron alloy with excellent resistance to oxidation and corrosion at elevated temperatures. Its primary advantage is the formation of a stable, adherent oxide layer that protects the base metal from further attack, making it an ideal material for demanding high-temperature applications. This document outlines the key properties of **Alloy 77 Seamless Tubes**, which are widely used in heat processing, industrial furnace, and thermal processing industries due to their superior strength and long service life. --- #### **1. Chemical Composition (Typical % by Weight)** The composition of Alloy 77 is carefully balanced to optimize its high-temperature performance. | Element | Content (%) | | :--- | :--- | | Nickel (Ni) | Balance (~76.0 min) | | Chromium (Cr) | 14.0 - 17.0 | | Iron (Fe) | 6.0 - 10.0 | | 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 | *Note: The precise composition may vary slightly depending on the manufacturer and specific product form (e.g., tube, sheet).* --- #### **2. Key Physical & Mechanical Properties** Alloy 77 maintains excellent mechanical strength and structural stability under high thermal loads. **Physical Properties:** * **Density:** 8.26 g/cm³ (0.298 lb/in³) * **Melting Point:** ~1371°C - 1427°C (~2500°F - 2600°F) * **Specific Heat (20°C):** 450 J/kg·K * **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 (Room Temperature - 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 *Note: Properties at elevated temperatures are a key selling point. Please consult technical datasheets for performance data at specific operating temperatures.* --- #### **3. Product Applications** **Alloy 77 Tubes** are specifically engineered for use in high-temperature and corrosive environments. Typical applications include: * **Radiant Tubes:** For radiant tube assemblies in carburizing, carbonitriding, annealing, and forging furnaces. * **Heat Exchangers & Recuperators:** Handling aggressive flue gases and high-temperature air. * **Industrial Furnace Components:** Such as muffles, retorts, and furnace rollers. * **Thermal Processing Equipment:** For the heat treatment of metals and ceramics. * **Power Generation:** Components in boiler systems and heat recovery steam generators (HRSG). * **Chemical Processing:** Equipment requiring resistance to oxidation and carburization. --- #### **4. International Standards & Specifications** Alloy 77 is covered by several major international standards, ensuring quality and interchangeability. The most common specifications for seamless tubes are: | Standard | Material Number | UNS Number | Common Name | | :--- | :--- | :--- | :--- | | **ASTM B163 / ASME SB163** | - | **N06003** | Seamless Condenser and Heat-Exchanger Tubes | | **ASTM B167 / ASME SB167** | - | **N06003** | Seamless Pipe and Tube | | **DIN 17742** | **2.4631** | - | NiCr15Fe | | **EN 10095 / ISO 9723** | **NiCr15Fe** (Similar) | - | - | *The UNS N06003 designation is the most universally recognized for this alloy.* --- #### **5. Key Advantages** * **Exceptional Oxidation Resistance:** Up to 1150°C (2100°F). * **Excellent Carburization Resistance:** Ideal for atmospheres rich in carbon. * **High-Temperature Strength:** Maintains load-bearing capacity at elevated temperatures. * **Good Thermal Stability:** Resists embrittlement and deformation over long service periods. * **Long Service Life:** Reduces downtime and maintenance costs. **Conclusion:** Alloy 77 (Nilomag 77) seamless tubes represent a premium solution for critical high-temperature applications. Their proven performance in aggressive thermal environments makes them a reliable and cost-effective choice for engineers and designers in the metallurgical, heat treatment, and power generation industries. --- **For more detailed technical information, size availability, or specific application engineering support, please contact our technical sales team.**

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 2785 gallon liquid totes Special package is available on request.