ASTM B423 UNS N08825 (Incoloy 825) Seamless Pipes
Introduction
ASTM B423 UNS N08825 (Incoloy 825) seamless pipes are manufactured from a nickel-iron-chromium alloy designed for exceptional corrosion resistance in harsh and corrosive environments. Containing additions of molybdenum, copper, and titanium, Incoloy 825 provides outstanding resistance to sulfuric acid, phosphoric acid, seawater, and chloride-induced stress corrosion cracking. These pipes offer superior performance in high-temperature, high-pressure, and aggressive chemical conditions, making them ideal for use in chemical processing, petrochemical plants, marine engineering, and oil & gas industries.
Key Features
- Exceptional resistance to sulfuric and phosphoric acids
- High resistance to chloride-induced stress corrosion cracking
- Excellent oxidation and scaling resistance at elevated temperatures
- Strong performance in seawater and brine service
- Good mechanical strength and structural stability
- Titanium-stabilized alloy prevents intergranular corrosion
- Suitable for high-temperature and high-pressure applications
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | N08825 |
| W.Nr. | 2.4858 |
| EN | NiFeCr21Mo |
| AFNOR | NC 21 FeDU |
| BS | NA 16 |
ASTM B423 UNS N08825 Chemical Composition
| Element | Percentage (%) |
|---|---|
| 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 |
| Manganese (Mn) | 1.0 max |
| Silicon (Si) | 0.5 max |
| Carbon (C) | 0.05 max |
| Sulfur (S) | 0.03 max |
UNS N08825 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 690 MPa (100 ksi) min |
| Yield Strength (0.2%) | 275 MPa (40 ksi) min |
| Elongation | 30% min |
| Hardness | Rb 80 max |
ASTM B423 Incoloy 825 Physical Properties
| Property | Value |
|---|---|
| Density | 8.14 g/cm³ |
| Melting Range | 1370 – 1400°C |
| Thermal Conductivity | 11.2 W/m·K |
| Electrical Resistivity | 1.20 µΩ·m |
| Specific Heat | 0.460 J/g·°C |
| Modulus of Elasticity | 195 GPa |
Type of ASTM B423 UNS N08825 Pipes
- Incoloy 825 Seamless Pipes
- Incoloy 825 Seamless Tubes
- Heat Exchanger Tubes
- Condenser Tubes
- Instrumentation Tubes
- Boiler & Superheater Tubes
Applications
- Chemical processing & acid handling systems
- Oil & gas production & offshore platforms
- Marine engineering & seawater equipment
- Petrochemical & refinery applications
- Pollution control & waste treatment plants
- Heat exchangers, evaporators & condensers
- Nuclear fuel reprocessing systems
- High-temperature furnace and thermal processing units
Reviews
There are no reviews yet.