Seamless Incoloy 825 Tube
Our Incoloy 825 seamless pipes comply with ASTM B423 and ASME SB423 standards, offering superior protection against stress-corrosion cracking, pitting, and crevice corrosion in sulfuric and phosphoric acid environments. Through advanced cold-drawing and precise heat treatment,GZH delivers durable, high-strength tubing for chemical processing, marine engineering, and oil & gas applications. Rely on our expertise for certified alloy solutions that meet the most stringent industrial specifications.
What Is an Seamless Incoloy 825 Tube?
Seamless Incoloy 825 Tube is a high-performance, corrosion-resistant tube made from a solid billet of a nickel-iron-chromium superalloy. Unlike welded tubes, it is manufactured without any weld seam, ensuring superior structural integrity and reliability, especially in highly corrosive environments. The"Incoloy 825"designation refers to a specific grade known for its exceptional resistance to a wide range of corrosive media, including acids and bases. The alloy's unique composition, which includes controlled additions of molybdenum, copper, and titanium, provides outstanding resistance to stress-corrosion cracking, pitting, and crevice corrosion. This makes it an ideal choice for demanding applications in harsh chemical and industrial settings where other materials would quickly fail.
Key Features and Advantages of Seamless Incoloy 825 Tube
Seamless Incoloy 825 Tube offer a unique combination of benefits that make them invaluable in the most demanding industries:
Excellent General Corrosion Resistance: Provides outstanding resistance to a variety of acids, particularly sulfuric and phosphoric acids.
Resistance to Stress-Corrosion Cracking: The high nickel content makes the alloy highly resistant to chloride-ion stress-corrosion cracking.
High Pitting and Crevice Corrosion Resistance: The presence of molybdenum and chromium provides excellent resistance to localized corrosion in aggressive environments.
High Pressure Tolerance: The seamless construction eliminates a potential weak point, allowing the tube to safely handle high internal pressures, which is critical in many fluid transfer and structural applications.
Superior Weldability: Despite its high-alloy content, Incoloy 825 is known for its excellent weldability, which is a significant advantage for fabrication and installation.
Product Specifications and Data of Seamless Incoloy 825 Tube
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.
| 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 Tube 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 of Seamless Incoloy 825 Alloy steel Tube
The combination of high corrosion resistance and high strength of Incoloy 825 seamless tubes makes them a preferred choice for:
Chemical Processing: Used in heat exchangers, pressure vessels, and piping for handling sulfuric acid, phosphoric acid, and other corrosive chemicals.
Oil and Gas Industry: In sour gas service and offshore platforms where resistance to stress corrosion cracking is critical.
Pollution Control: In scrubbers and stack liners for flue-gas desulfurization (FGD) systems.
Nuclear Industry: In fuel reprocessing plants and waste handling equipment.
Manufacturing Process of Seamless Incoloy 825 Alloy steel Tube
The manufacturing of an Seamless Incoloy 825 Tube 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.
- Rolling and Sizing: The hollow shell is then rolled and drawn to reduce its diameter and wall thickness to the desired dimensions.
- Heat Treatment: The tube is heat-treated (annealed) to achieve the specified mechanical properties and to ensure optimal corrosion resistance.
- Finishing: The tube 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 Incoloy 825 seamless tube meets the highest standards for performance and reliability in the most demanding applications.