Alloy S,Hastelloy S Rod,UNS N06635,E FORU

British Specs:，American Specs: AMS 5711 Bar and Forging AMS 5838 Welding Wire AMS 5873 Sheet, Strip and Plate，German Specs:

### **Technical Datasheet: Alloy S (UNS N06635) Rod** **Overview** Alloy S Rod, commercially known as Hastelloy® S Rod and standardized as UNS N06635, is a nickel-chromium-molybdenum wrought superalloy supplied in a round bar or rectangular bar form. It is specifically engineered for exceptional high-temperature structural integrity, offering an outstanding balance of oxidation resistance, thermal stability, and fabricability. The rod product is primarily used for machining components that must withstand severe thermal cycling, oxidizing, sulfidizing, and carburizing environments up to 1200°C (2200°F). **Key Characteristics of Alloy S Rod** * **Exceptional High-Temperature Strength:** Maintains high load-bearing capacity and excellent creep-rupture properties at elevated temperatures. * **Superior Oxidation & Sulfidation Resistance:** The addition of Lanthanum (La) ensures a highly adherent, protective oxide scale that resists spalling during thermal cycling. * **Outstanding Thermal Stability:** The low carbon content and balanced chemistry prevent embrittlement from sigma and other detrimental phase formation during long-term exposure. * **Excellent Machinability:** In the annealed condition, Alloy S rod can be machined using standard techniques for nickel-based alloys, allowing for the production of complex components. --- ### **Chemical Composition (Weight % Typical)** The composition is meticulously balanced to provide long-term microstructural stability at high temperatures. | Element | Percentage (%) | Primary Function | | :--- | :--- | :--- | | **Nickel (Ni)** | Balance (~67%) | Base element; provides the austenitic matrix and general stability. | | **Chromium (Cr)** | 14.0 - 16.0% | Imparts primary resistance to oxidation and sulfidation. | | **Molybdenum (Mo)** | 14.0 - 16.0% | Provides solid solution strengthening and resistance to reducing environments. | | **Iron (Fe)** | 3.0% max | Residual element. | | **Tungsten (W)** | 1.0% max | Contributes to solid solution strengthening. | | **Cobalt (Co)** | 2.0% max | Controlled residual element. | | **Manganese (Mn)** | 0.50% max | Aids in hot workability. | | **Silicon (Si)** | 0.40% max | Enhances oxidation resistance. | | **Lanthanum (La)** | 0.02% min | **Critical Feature:** dramatically improves oxide scale adhesion under thermal cycling. | | **Carbon (C)** | 0.015% max | Kept very low to prevent harmful carbide precipitation and enhance weldability/stability. | | **Boron (B)** | 0.010% max | Improves creep ductility. | *Note: "Hastelloy" is a registered trademark of Haynes International Inc.* --- ### **Physical Properties (Typical - Annealed Rod)** | Property | Value | | :--- | :--- | | **Density** | 8.86 g/cm³ (0.320 lb/in³) | | **Melting Point** | 1335 - 1380°C (2435 - 2520°F) | | **Thermal Conductivity** | 11.0 W/m·K (at 20°C) | | **Coefficient of Thermal Expansion** | 12.8 μm/m·°C (20-100°C) | | **Modulus of Elasticity (Tensile)** | 211 GPa (30.6 x 10⁶ psi) | | **Electrical Resistivity** | 1.30 μΩ·m | --- ### **Mechanical Properties (Typical for Rod Product)** **Room Temperature (Annealed Condition):** * **Tensile Strength:** 795 MPa (115 ksi) min * **Yield Strength (0.2% Offset):** 345 MPa (50 ksi) min * **Elongation:** 35% min **Elevated Temperature (980°C / 1800°F):** * **Stress-Rupture Strength:** Exhibits superior stress-rupture life compared to many other chromia-forming alloys, a key reason for its selection in high-temperature structural applications. --- ### **Product Applications: Alloy S Rod** The rod form of Alloy S is typically machined into critical components for high-temperature service. * **Industrial Furnaces & Heat Treatment:** * **Furnace Rolls:** Machined shafts and journals for rollers. * **Fixtures & Trays:** Machined brackets, hangers, and boat fixtures for sintering, brazing, and heat treatment. * **Radiant Tube Hangers:** Components supporting radiant tubes in high-temperature furnaces. * **Aerospace & Gas Turbines:** * **Turbine Seals & Ring Segments:** Machined from bar stock to precise tolerances. * **Fasteners:** High-temperature bolts, studs, and nuts. * **Combustion System Components:** Structural parts within the combustor section. * **Chemical Processing:** * **Valve Stems & Trim:** For high-temperature control valves. * **Agitator Shafts:** For reactors operating in corrosive atmospheres. * **Process Piping Components:** Machined fittings and spools. * **Glass Manufacturing:** * **Mandrels & Forming Tools:** Tools for handling and forming glass at high temperatures. --- ### **International Standards for Rod/Bar Product** Alloy S Rod (UNS N06635) is covered by several key international standards that define its requirements. | Standard Organization | Standard Number | Title / Description | | :--- | :--- | :--- | | **ASTM International** | **ASTM B335** | Standard Specification for *Nickel-Molybdenum Alloy Rod and Bar* (The primary ASTM specification for bar products). | | **ASTM International** | **ASTM B572** | Standard Specification for *UNS N06635 Rod* (A specific specification for this alloy). | | **ASME (American Society of Mechanical Engineers)** | **ASME SB-335**
**ASME SB-572** | Equivalent to ASTM standards for code-approved construction (e.g., pressure vessels). | | **SAE International** | **AMS 5772** | Aerospace Material Specification for *Bars, Forgings, and Rings, Corrosion and Heat-Resistant, Nickel Alloy 66Cr-15Mo-2W (UNS N06635) Consumable Electrode or Vacuum Induction Melted, Annealed*. This is a critical specification for aerospace-grade bar stock. | | **UNS (Unified Numbering System)** | **UNS N06635** | The universal designation for this alloy composition. | **Disclaimer:** This information is for reference purposes only. Material properties can vary based on the specific heat treatment, lot size, and final diameter of the rod. For critical applications, always consult the relevant material standard and the manufacturer's certified test reports. "Hastelloy" is a registered trademark of Haynes International.

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 2886 gallon liquid totes Special package is available on request.