Seamless Incoloy 825 Pipe
Our Incoloy 825 pipes are stabilized with Titanium to inhibit intergranular corrosion and provide superior protection against chloride-ion stress corrosion cracking (SCC) and pitting in sulfuric and phosphoric acid environments. We offer a comprehensive size range from 1/2” to 12” NPS and wall thicknesses from SCH 10 to SCH 80. Through advanced cold-drawing and vacuum annealing, GZH ensures every pipe delivers the structural integrity required for chemical processing, pollution control, and offshore oil & gas applications.
What Is a Seamless Incoloy 825 Pipe?
Seamless Incoloy 825 Pipe is a high-performance, corrosion-resistant pipe crafted from a single, solid billet of a nickel-iron-chromium-molybdenum-copper alloy. It's manufactured without a weld joint, ensuring superior structural integrity and reliability, especially under high-stress and highly corrosive conditions. The"Incoloy 825"designation refers to a specific grade known for its exceptional resistance to a wide range of corrosive environments. Its unique composition, which includes copper and molybdenum, provides outstanding resistance to both oxidizing and reducing acids, as well as to pitting and crevice corrosion. This makes it a top choice for demanding applications in the chemical processing, oil and gas, and pollution control industries.
Key Features and Advantages
Seamless Incoloy 825 Pipes offer a unique combination of benefits that make them invaluable in the most demanding industries:
Exceptional Corrosion Resistance: Provides outstanding resistance to a wide range of corrosive media, including sulfuric, phosphoric, and nitric acids. The high molybdenum and copper content also offers excellent resistance to chloride-ion stress-corrosion cracking, pitting, and crevice corrosion.
High Pressure and Temperature Tolerance: The seamless construction and robust material allow the pipe to safely handle high internal pressures and a wide range of operating temperatures.
Good Mechanical Properties: It maintains high tensile and yield strength, providing reliable performance in high-stress applications.
Superior Weldability: The alloy can be welded using standard methods without the risk of post-weld corrosion, thanks to its stabilized composition.
Versatility: Its broad resistance to various corrosive chemicals makes it a highly versatile material for a wide range of applications.
Product Specifications and Data
To provide a comprehensive overview of this high-performance material, here are the detailed technical specifications and performance data for Incoloy 825.
Table 1: Chemical Composition of Incoloy 825
The composition of Incoloy 825 is carefully balanced to achieve its superior corrosion resistance and high strength.
| Ni | Cr | Fe | Mn | C | Cu | Si | S | Al |
| 38.00-46.00 | 19.50-23.50 | ≥22.00 | ≤1.00 | ≤0.05 | 1.50-3.00 | ≤0.50 | ≤0.03 | ≤0.20 |
Table 2: Typical Mechanical Properties of Incoloy 825
Incoloy 825 is specifically designed to maintain its strength and shape in high-stress, corrosive environments.
| Tensile Strength | Yield Strength | Elongation | Hardness |
| ≥ 586 MPa | ≥ 241 MPa | ≥ 30% | ≤ 192 HBW |
Table 3: Typical Physical Properties of Incoloy 825
These physical properties highlight the material's ability to perform reliably under a wide range of conditions.
| Density | Melting Point | Thermal Expansion | Thermal Conductivity | Modulus of Elasticity | Electrical Resistivity |
| 8.14 g/cm³ | 1340 - 1400 °C approx. | 14.0 µm/m·°C (20-100°C) | 11.1 W/m·K (20°C) | 195 GPa | 1.14 x 10⁻⁶ Ω·m (20°C) |
Table 4: The Standard of Seamless Incoloy 825 Pipe ASTM B163 Size Tolerance Chart (mm):
| STANDARD | OD[D] | TOLERANCE | THICKNESS[S] | TOLERANCE | LENGTH | TOLERANCE |
| B163 (N02200,N02201,N04400) | 12.7≤D<15.9 | +0.13/0 | ave, ±12.5% | min:+25.0%/0 | Cut-to-length | +3.2/-0 |
| 15.9≤D≤38.1 | ±0.13 | ave, ±10.0% | min:+20.0%/0 | |||
| 38.1 | ±0.25 | ave, ±10.0% | min:+22.0%/0 | |||
| B163(for rest) | 12.7≤D<15.9 | ±0.13 | ave, ±12.5% | min:+25.0%/0 | Cut-to-length:>9.1m | +6.4/0 |
| 15.9 | ±0.19 | ave, ±10.0% | min:+20.0%/0 | |||
| 38.1 | ±0.25 | ave, ±10.0% | min:+22.0%/0 |
Common Applications
The combination of high corrosion resistance and good mechanical properties of seamless Incoloy 825 pipes makes them a preferred choice for:
Chemical Processing: Used in reactors, heat exchangers, and piping for handling sulfuric, phosphoric, and other aggressive acids.
Oil and Gas Industry: For piping, risers, and manifolds in sour gas service and other corrosive environments.
Pollution Control: In scrubbers and stack liners for flue-gas desulfurization (FGD) systems.
Marine Engineering: For seawater applications and components where resistance to saltwater corrosion is critical.
Manufacturing Process
The manufacturing of a seamless Incoloy 825 pipe is a precise, multi-step process:
- Heating: A solid billet of Incoloy 825 is heated to a high temperature.
- Piercing: A piercing mill pushes a mandrel through the center of the heated billet to form a hollow shell.
- Drawing and Sizing: The hollow shell is then rolled and drawn to reduce its diameter and wall thickness to the desired dimensions.
- Heat Treatment: The pipe is solution annealed to achieve its specified metallurgical properties and to ensure optimal performance.
- Finishing: The pipe is cut to length, straightened, and subjected to rigorous testing to ensure it meets the highest standards for performance and reliability. This meticulous process ensures that every seamless Incoloy 825 pipe is built to withstand the most demanding applications
