Alloy 825,Incoloy 825,UNS N08825,EFORU

### **Technical Datasheet: Alloy 825 (Incoloy 825, UNS N08825)** 

 **Overview** Incoloy 825 (Alloy 825, UNS N08825) is a nickel-iron-chromium alloy with additions of molybdenum and copper, specifically designed for excellent corrosion resistance in a wide range of aggressive environments. This austenitic alloy provides outstanding performance in both oxidizing and reducing acids, making it particularly suitable for chemical processing, pollution control, and acid production applications. 

### **Technical Datasheet: Alloy 825 (Incoloy 825, UNS N08825)** 

 **Overview** Incoloy 825 (Alloy 825, UNS N08825) is a nickel-iron-chromium alloy with additions of molybdenum and copper, specifically designed for excellent corrosion resistance in a wide range of aggressive environments. This austenitic alloy provides outstanding performance in both oxidizing and reducing acids, making it particularly suitable for chemical processing, pollution control, and acid production applications. 

 **Key Characteristics** - 

**Excellent resistance to sulfuric and phosphoric acids** - 

**Good resistance to chloride ion stress-corrosion cracking** - 

**Enhanced resistance to pitting and crevice corrosion** - 

**Good mechanical properties over a wide temperature range** - 

**Excellent weldability and fabricability** 

1. Chemical Composition (Weight %)**

| Element | Composition (%) | 

|---------|-----------------| 

| **Nickel (Ni)** | 38.0-46.0 | 

| **Chromium (Cr)** | 19.5-23.5 | 

| **Iron (Fe)** | Balance | 

| **Molybdenum (Mo)** | 2.5-3.5 | 

| **Copper (Cu)** | 1.5-3.0 | 

| **Titanium (Ti)** | 0.6-1.2 | 

| **Carbon (C)** | ≤0.05 | 

| **Manganese (Mn)** | ≤1.00 | 

| **Silicon (Si)** | ≤0.50 | 

| **Sulfur (S)** | ≤0.03 | 

| **Aluminum (Al)** | ≤0.20 | 

2. Physical Properties** 

 | Property | Value | 

|----------|-------|

 | **Density** | 8.14 g/cm³ | 

| **Melting Range** | 1370-1400°C | 

| **Thermal Conductivity** | 10.8 W/m·K | 

| **Specific Heat** | 440 J/kg·K | 

| **Coefficient of Thermal Expansion** | 14.0 μm/m·°C |

 | **Modulus of Elasticity** | 196 GPa | 

| **Electrical Resistivity** | 1.12 μΩ·m | 

3. Mechanical Properties** 

 **Room Temperature (Annealed Condition):** - 

**Tensile Strength**: 586-758 MPa - 

**Yield Strength (0.2% Offset)**: 241-345 MPa - 

**Elongation**: 30-45% **Elevated Temperature (500°C):** - 

**Tensile Strength**: ~520 MPa - 

**Yield Strength**: ~200 MPa

4. International Standards** 

 | Product Form | Standard | 

|--------------|----------| 

| **Plate, Sheet, Strip** | ASTM B424, ASME SB424 | 

| **Bar & Forgings** | ASTM B425, ASME SB425 | 

| **Seamless Tubing** | ASTM B163, ASME SB163 | 

| **Welded Tubing** | ASTM B704, B705 | 

| **Pipe & Fittings** | ASTM B423, ASME SB423 | 

| **European Standard** | EN 2.4858 | 

| **Unified Numbering** | UNS N08825 | -

5. Applications** 

 **Chemical Processing:** 

- Sulfuric acid pickling tanks and heating coils 

- Phosphoric acid production equipment 

- Nuclear fuel reprocessing components 

- Acid mixing and storage vessels 

 **Oil and Gas Industry:** 

- Downhole production tubing 

- Wellhead components 

- Seawater cooling systems 

- Pipeline protection in sour service 

 **Pollution Control:** 

- Flue gas desulfurization systems 

- Scrubbers and absorbers 

- Waste water treatment equipment 

- Acid waste incineration systems 

 **Marine and Offshore:** 

- Seawater piping systems 

- Ballast water tanks 

- Heat exchangers and condensers 

- Offshore platform components 

 **Other Applications:** 

- Acid production plants 

- Radioactive waste processing 

- Pharmaceutical processing equipment 

- Pickling line equipment in steel industry --- 

 **Summary**

 Incoloy 825 (UNS N08825) is a versatile nickel-iron-chromium alloy that offers exceptional corrosion resistance in a wide spectrum of aggressive environments. Its balanced composition provides excellent resistance to both oxidizing and reducing acids, while the molybdenum content enhances resistance to localized corrosion and the copper addition improves resistance to reducing chemicals. The alloy's proven performance in severe corrosive environments, combined with good mechanical properties and fabricability, has established it as a benchmark material in chemical processing, oil and gas, pollution control, and marine applications worldwide. Comprehensive international standardization ensures consistent quality and performance across all product forms.

Packing of  Alloy 825 (Incoloy 825, UNS N08825)** 

 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 1646 gallon liquid totes Special package is available on request.