INCOLOY alloy 864,UNS S35135，1

### **Product Introduction: INCOLOY® Alloy 864 (UNS S35135)** **INCOLOY® Alloy 864** is an iron-nickel-chromium austenitic alloy specifically designed for applications requiring excellent corrosion resistance and good mechanical properties at elevated temperatures. This versatile alloy offers a balanced combination of oxidation resistance, carburization resistance, and sulfidation resistance, making it suitable for various industrial applications in moderately aggressive environments. The alloy's carefully controlled composition provides reliable performance in a wide range of corrosive media while maintaining good fabricability and weldability characteristics, making it a cost-effective solution for many industrial applications. --- ### **Chemical Composition** | Element | Content (%) | |---------|-------------| | **Iron (Fe)** | Balance | | **Nickel (Ni)** | 28.0 - 32.0 | | **Chromium (Cr)** | 19.0 - 22.0 | | **Copper (Cu)** | 0.70 - 1.50 | | **Manganese (Mn)** | 1.50 max | | **Silicon (Si)** | 1.50 max | | **Carbon (C)** | 0.08 max | | **Sulfur (S)** | 0.015 max | | **Phosphorus (P)** | 0.030 max | --- ### **Physical Properties** | Property | Value | |----------|-------| | **Density** | 7.92 g/cm³ | | **Melting Point** | 1390 - 1430 °C | | **Thermal Conductivity** | 14.2 W/m·K (at 20°C) | | **Electrical Resistivity** | 0.90 μΩ·m | | **Modulus of Elasticity** | 195 GPa | | **Coefficient of Thermal Expansion** | 15.0 μm/m·°C (20-500°C) | | **Specific Heat Capacity** | 480 J/kg·K | | **Magnetic Response** | Essentially non-magnetic | --- ### **Mechanical Properties** **Room Temperature Properties:** - **Tensile Strength:** 550 - 750 MPa - **Yield Strength (0.2% Offset):** 240 - 450 MPa - **Elongation:** 40 - 50% - **Hardness:** 70 - 90 HRB **Elevated Temperature Performance:** - **Maximum Service Temperature:** 900°C - **Good oxidation resistance up to 900°C** - **Adequate creep strength for moderate temperature applications** --- ### **Key Characteristics & Advantages** 1. **Good Corrosion Resistance** - Excellent resistance to oxidizing environments - Good performance in moderately reducing conditions - Adequate resistance to sulfur-containing atmospheres 2. **High-Temperature Capability** - Good oxidation resistance up to 900°C - Moderate carburization resistance - Stable mechanical properties at elevated temperatures 3. **Excellent Fabricability** - Good weldability using conventional methods - Suitable for both hot and cold working operations - Can be machined using standard techniques 4. **Cost-Effective Performance** - Balanced property profile at competitive cost - Good availability and manufacturability - Reliable performance in various industrial applications --- ### **Product Applications** **Thermal Processing Industry:** - Heat treatment furnace components - Annealing covers and retorts - Industrial oven parts - Moderate temperature heating elements **Chemical Processing:** - Process vessels and reactors - Heat exchanger tubing - Chemical processing equipment - Piping systems for corrosive media **Power Generation:** - Boiler components - Heat recovery systems - Power plant tubing - Energy conversion equipment **Industrial Applications:** - Petrochemical equipment - Food processing machinery - Pulp and paper industry components - General industrial heating applications --- ### **International Standards** | Standard Type | Standard Number | Description | |---------------|-----------------|-------------| | **UNS** | S35135 | Unified Numbering System | | **ASTM** | B409 | Plate, Sheet, and Strip | | **ASTM** | B514 | Welded Tube | | **ASME** | SB-409 | Code Cases | | **Customer Specifications** | Various | Application-specific requirements | --- ### **Summary** **INCOLOY® Alloy 864 (UNS S35135)** is a versatile iron-nickel-chromium alloy that offers a balanced combination of corrosion resistance, high-temperature capability, and excellent fabricability at a competitive cost. Its optimized composition provides reliable performance in various industrial applications, particularly in thermal processing, chemical processing, and power generation sectors. The alloy's good oxidation resistance up to 900°C, combined with its excellent manufacturability and weldability, makes it a practical choice for applications where more expensive high-performance alloys may not be justified. Certification to major international standards including ASTM B409 and ASME SB-409 ensures consistent quality and performance, providing engineers with a cost-effective material solution for moderately demanding applications requiring good corrosion resistance and elevated temperature capability.

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 3353 gallon liquid totes Special package is available on request.