Seamless Incoloy 925 Pipe
GZH, a professional Incoloy 925 seamless pipe manufacturer and supplier based in Wenzhou, China, specializes in the precision production of nickel alloy seamless pipes using advanced hot-extrusion and cold-finishing processes. We supply Incoloy 925 pipes in a comprehensive range of outer diameters, wall thicknesses, and customized cut-to-length specifications to meet demanding project requirements.
Our Incoloy 925 seamless pipes are manufactured in accordance with international standards such as ASTM B423, ASTM B704, and ASME SB423, ensuring consistent quality and reliable performance. Each pipe undergoes rigorous inspection and testing procedures, including hydrostatic testing, eddy current testing, ultrasonic testing, and PMI (Positive Material Identification), guaranteeing compliance with strict industry specifications.
With strong production capacity, strict quality control systems, competitive pricing, and reliable global delivery, GZH has established itself as a trusted supplier of Incoloy 925 seamless pipes for oil & gas exploration, offshore platforms, marine engineering, and chemical processing industries worldwide.
What Is a Seamless Incoloy 925 Pipe?
SeamlessIncoloy 925 pipe is a high-strength, corrosion-resistant pipe crafted from a single, solid billet of a nickel-iron-chromium alloy that is strengthened by age hardening. It is manufactured without a weld joint, ensuring superior structural integrity and reliability, especially in highly corrosive environments where high strength is also required. The"Incoloy 925"designation refers to a specific grade that is a precipitation-hardenable version of Incoloy 825. Its unique composition, which includes controlled amounts of titanium and aluminum, allows it to be heat-treated to achieve exceptional strength while maintaining the excellent corrosion resistance of Incoloy 825. This makes it a top choice for demanding applications in the oil and gas industry, particularly in sour gas environments.
Key Features and Advantages
Seamless 925 Pipe offer a unique combination of benefits that make them invaluable in the most demanding industries:
High Strength: The age-hardening heat treatment provides significantly higher tensile and yield strength than non-hardenable alloys, allowing for the use of thinner wall thicknesses and reduced material costs in high-pressure applications.
Exceptional Corrosion Resistance: It provides outstanding resistance to chloride-ion stress-corrosion cracking, pitting, and crevice corrosion, particularly in sour gas and saltwater environments.
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 Weldability: The alloy can be welded using standard methods, and subsequent heat treatment can restore the desired mechanical properties.
Versatility: Its combination of high strength and exceptional corrosion resistance 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 925.
Table 1: Chemical Composition of Incoloy 925
The composition of Incoloy 925 is carefully balanced to achieve its superior strength and corrosion resistance.
| Grade | UNS | C | Mn | P | S | Si | Ni | Cr | Mo | Cu | Fe | Ti | Al | Other |
| Incoloy 825 | N08825 | ≤0.05 | ≤1.0 | ≤0.030 | ≤0.030 | ≤0.5 | 38.0-46.0 | 19.5-23.5 | 2.5-3.5 | 1.5-3.0 | Bal ≥22.0 | 0.6-1.2 | ≤0.2 | ··· |
| Incoloy 925 | N09925 | ≤0.03 | ≤1.0 | ≤0.030 | ≤0.030 | ≤0.5 | 42.0-46.0 | 19.5-23.5 | 2.5-3.5 | 1.5-3.0 | Bal ≥22.0 | 1.9-2.4 | 0.1-0.5 | Nb: ≤0.05 |
Table 2: Typical Mechanical Properties of Incoloy 925
Incoloy 925 is specifically designed to maintain its strength and shape in high-stress, corrosive environments.
| Tensile Strength | Yield Strength | Elongation | Hardness |
| ≥ 965 MPa | ≥ 690 MPa | ≥ 25% | 30 - 35 HRC |
Table 3: Typical Physical Properties of Incoloy 925
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. | 13.9 µm/m·°C (20-100°C) | 11.1 W/m·K (20°C) | 195 GPa | 1.15 x 10⁻⁶ Ω·m (20°C) |
| STANDARD | OD[D] | TOLERANCE | THICKNESS[S] | TOLERANCE | LENGTH | TOLERANCE |
| ASTM B829 (Seamless Cold-Worked Tube and Pipe) | 10 | ±0.13 | S(ave): ±15% | S(Min):+30%/0 | D<50.8 | +3.2/0 |
| 16≤D≤38 | ±0.19 | S(ave): ±10% | S(Min):+22%/0 | |||
| 38 | ±0.25 | |||||
| 76 | ±0.38 | 50.8≤D | +4.8/0 | |||
| 114 | ±0.51 | S(ave): ±12.5% | S(Min):+28%/0 | |||
| 152 | ±0.64 | |||||
| 168 | ±0.79 | |||||
| 219 | +1.57/-0.79 | S(ave): +15%/-12.5% | S(Min):+30%/0 | |||
| 356 | +3.18/-0.79 | |||||
| ASTM B829 (Hot-Finished Tube) | 19≤D≤38 | +0.4/-0.8 | S(ave): ±12.5% | S(Min):+28.5%/0 | D<50.8 | +3.2/0 |
| 38 | +0.8/-0.8 | 50.8≤D | +4.8/0 | |||
| 102 | +1.6/-0.8 | |||||
| ASTM B829 (Seamless Hot-Worked Pipe) | 25≤D≤48 | +0.4/-0.79 | S(ave): +16%/-12.5% | S(Min):+28.5%/0 | D<50.8 | +3.2/0 |
| 48 | ±0.79 | |||||
| 114 | ±1.2 | 50.8≤D | +4.8/0 | |||
| 165 | ±1.6 |
Common Applications
The combination of high strength and exceptional corrosion resistance of seamless Incoloy 925 pipes makes them a preferred choice for:
Oil and Gas Industry: For downhole components, hangers, and wellhead equipment in sour gas service.
Marine Engineering: For components exposed to saltwater environments where high strength is required.
Pumps and Valves: In the chemical and process industries for components requiring both high strength and corrosion resistance.
Aerospace: In high-stress applications where both strength and corrosion resistance are critical.
Manufacturing Process
The manufacturing of a Seamless Incoloy alloy steel Pipe is a precise, multi-step process:
- Heating: A solid billet of Incoloy 925 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 and then age-hardened to achieve its specified metallurgical and mechanical properties.
- 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 925 pipe is built to withstand the most demanding applications.
