HAYNES HR120 Severe Corrosion and Heat Resistant Alloy, UNS N08120; ，1

### **Product Introduction: HAYNES® HR-120™ (UNS N08120) Severe Corrosion and Heat Resistant Alloy** **Overview** HAYNES HR-120 is a modern, nickel-iron-chromium alloy engineered for exceptional high-temperature strength and outstanding resistance to oxidation, carburization, and sulfidation. Developed to offer a cost-effective and performance-advanced alternative to traditional alloys like 310 and 800H, HR-120 combines high strength with excellent fabricability. Its elevated chromium and nickel content, along with a unique combination of solid-solution strengtheners like tungsten and nitrogen, makes it an ideal choice for demanding applications in industrial heating, heat treating, and power generation where structural integrity under thermal and mechanical stress is critical. --- #### **Chemical Composition (Typical % by Weight)** The sophisticated composition of HR-120 is the foundation of its superior high-temperature capabilities. | Element | Content (%) | Role & Benefit | | :--- | :--- | :--- | | **Nickel (Ni)** | 35.0 - 39.0 | Stabilizes the austenitic matrix and provides fundamental resistance to oxidation and carburization. | | **Chromium (Cr)** | 23.0 - 27.0 | Imparts exceptional resistance to oxidation, sulfidation, and other high-temperature corrosive environments by forming a durable, protective chromium oxide scale. | | **Iron (Fe)** | Balance | Forms the base of the alloy matrix, contributing to cost-effectiveness while maintaining performance. | | **Cobalt (Co)** | 3.0 max | A residual element. | | **Tungsten (W)** | 2.0 - 3.5 | A potent solid-solution strengthener that significantly enhances high-temperature creep strength. | | **Molybdenum (Mo)** | 2.0 - 3.0 | Contributes to solid-solution strengthening and improves resistance to reducing environments. | | **Niobium (Nb)** | 0.5 - 1.5 | Strengthens the alloy by forming stable carbides and nitrides, enhancing creep rupture strength. | | **Nitrogen (N)** | 0.15 - 0.30 | A powerful solid-solution strengthener that significantly increases short and long-term high-temperature strength without sacrificing ductility. | | **Manganese (Mn)**| 0.7 - 1.5 | Aids in manufacturability and helps control sulfur. | | **Silicon (Si)** | 0.2 - 0.6 | Enhances resistance to oxidation and carburization. | | **Carbon (C)** | 0.02 - 0.06 | Controlled content contributes to strength through carbide formation. | | **Boron (B)** | 0.001 - 0.010 | Added in trace amounts to improve creep ductility and strength. | | **Phosphorus (P)**| 0.03 max | Kept low to ensure good ductility and toughness. | | **Sulfur (S)** | 0.01 max | A detrimental element kept to an absolute minimum to prevent hot cracking. | *Note: "HAYNES" and "HR-120" are trademarks of Haynes International Inc.* --- #### **Physical & Mechanical Properties (Typical)** | Property | Value / Condition | | :--- | :--- | | **Density** | 7.94 g/cm³ (0.287 lb/in³) | | **Melting Range** | 1330 - 1380 °C (2425 - 2515 °F) | | **Specific Heat** | 455 J/kg·K (0.109 BTU/lb·°F) @ 20°C | | **Thermal Conductivity**| 12.5 W/m·K (86.6 BTU·in/hr·ft²·°F) @ 100°C | | **Thermal Expansion** | 14.5 μm/m·°C (8.1 μin/in·°F) @ 20-100°C | | **Tensile Strength (Room Temp)** | 690 MPa (100 ksi) min | | **Yield Strength (0.2% Offset, Room Temp)** | 345 MPa (50 ksi) min | | **Elongation (Room Temp)** | 40% min | --- #### **International Standards and Specifications** HR-120 is covered by several key international standards for wrought products. * **ASTM B409:** Standard Specification for Nickel-Iron-Chromium Alloy Plate, Sheet, and Strip. * **ASTM B564:** Standard Specification for Nickel Alloy Forgings (for forged components). * **ASTM B366:** Standard Specification for Factory-Made Wrought Nickel and Nickel Alloy Fittings. * **ASME SB-409 / SB-564:** Approved for use in ASME Boiler and Pressure Vessel Code applications. * **UNS N08120:** Unified Numbering System designation. * **DIN 2.4854:** The corresponding material number in the German standard. --- #### **Product Applications** HR-120 is widely used in high-temperature industrial applications where strength and corrosion resistance are paramount. 1. **Industrial Furnaces & Heat Treating:** * Radiant tubes, roller hearths, and furnace muffles. * Heat treatment baskets, trays, and fixtures. * Components for carburizing and neutral hardening furnaces. 2. **Petrochemical & Chemical Processing:** * Tube hangers and supports in steam methane reformers and ethylene cracking furnaces. * Process piping and heat exchangers for high-temperature processes. 3. **Power Generation:** * Superheater and reheater tubing, hangers, and supports in advanced pulverized coal and waste-to-energy boilers. * Components in heat recovery steam generators (HRSGs). 4. **Aerospace:** * High-temperature engine and airframe components. #### **Key Advantages** * **Superior High-Temperature Strength:** Offers significantly higher creep and rupture strength compared to many traditional iron-nickel-chromium alloys like 800H and 803. * **Excellent Oxidation & Carburization Resistance:** The high chromium content provides outstanding resistance to scaling and internal degradation in oxidizing and carburizing atmospheres up to 1200°C (2200°F). * **Good Fabricability:** Can be welded, formed, and machined using standard commercial techniques, allowing for the manufacture of complex components. * **Cost-Effective Performance:** Provides a favorable balance of high performance and cost compared to more expensive nickel-base superalloys. **Conclusion** HAYNES® HR-120™ (UNS N08120) is a advanced, solid-solution strengthened alloy that sets a high standard for performance in aggressive high-temperature environments. Its optimized chemistry delivers an exceptional combination of mechanical strength, resistance to various forms of high-temperature corrosion, and excellent fabricability. For engineers designing equipment for industrial heating, petrochemical processing, and power generation, HR-120 offers a robust and reliable solution, fully backed by international standards like ASTM and ASME.

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 3397 gallon liquid totes Special package is available on request.