Seamless Incoloy 925 Tube
Our Incoloy 925 seamless pipes are designed to withstand high-pressure environments containing hydrogen sulfide (H2S), chlorides, and carbon dioxide. Through precise precipitation hardening and advanced cold-finishing processes, we deliver tubes with superior resistance to pitting and stress-corrosion cracking. XinZhe ensures every tube undergoes rigorous non-destructive testing, providing reliable solutions for downhole equipment, marine fasteners, and high-strength piping systems.
Seamless Incoloy 925 Tube – High-Strength Nickel Alloy Tubing for Extreme Corrosive Environments
ASeamless Incoloy 925 Tube is a high-performance nickel-iron-chromium alloy tube (UNS N09925) designed for demanding industrial environments requiring exceptional strength and corrosion resistance.
Unlike welded tubing, seamless Incoloy 925 tubing is manufactured through hot extrusion or precision cold drawing from solid billets, eliminating longitudinal weld seams. This seamless structure ensures uniform mechanical properties, superior structural integrity, and improved reliability under high pressure and corrosive conditions.
Incoloy Alloy 925 is an age-hardenable superalloy strengthened by controlled additions of molybdenum (Mo), copper (Cu), titanium (Ti), and aluminum (Al). Through precipitation hardening (age hardening), the alloy develops significantly enhanced tensile and yield strength while maintaining outstanding resistance to sulfide stress cracking (SSC)andstress corrosion cracking (SCC) in aggressive environments.
Because of these properties, Alloy 925 seamless tubes are widely used in oil & gas, chemical processing, marine engineering, and power generation systems.
Key Technical Advantages of Seamless Incoloy 925 Tubing
SelectingUNS N09925 seamless tubing offers several critical advantages for high-reliability industrial applications:
Superior Corrosion Resistance
Seamless Incoloy 925 exhibits exceptional resistance to pitting corrosion, crevice corrosion, and stress corrosion cracking, especially in sour gas environments containing hydrogen sulfide (H₂S) and high-chloride media.
High Mechanical Strength
Throughage-hardening heat treatment, Alloy 925 achieves yield strengths nearly twice that of conventional austenitic stainless steels such as 316L, while maintaining good ductility.
Excellent Thermal Stability
The alloy maintains high fracture toughness and structural stability across a wide temperature range, from cryogenic conditions to elevated operating temperatures encountered in process industries.
High-Pressure Performance
Theseamless manufacturing process eliminates weld seams, reducing the risk of longitudinal failure and enabling higher pressure ratings in subsea and downhole equipment.
Reduced Life-Cycle Cost
Due to its long service life, corrosion resistance, and mechanical durability, Incoloy 925 tubing reduces maintenance frequency, system downtime, and total cost of ownership (TCO).
Product Specifications and Data of Seamless Incoloy 925 Tube
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 corrosion resistance and high strength.
| 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 925Table 4: The Standard of Seamless Nickel Alloy Tube or Pipe ASTM B829 Size Tolerance Chart (mm):
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) |
Table 4: The Standard of Seamless Nickel Alloy Tube or Pipe ASTM B829 Size Tolerance Chart (mm):
| 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 |
Typical Applications of Alloy 925 Seamless Tubes
Thanks to its robust metallurgical properties, Seamless Incoloy Alloy 925 Tubing is widely used in critical industries:
Oil & Gas Industry
- Downhole completion equipment
- Tool joints and wellhead components
- Production tubing and hangers
- Sour gas service valves and fittings
Chemical & Petrochemical Processing
- Corrosion-resistant piping systems
- Heat exchanger tubing
- High-pressure reactor components
- Acidic or chloride-containing fluid handling systems
Marine & Offshore Engineering
- High-strength marine fasteners
- Propeller shafts and subsea hardware
- Offshore platform structural components
Power Generation
- High-performance heat transfer tubing
- Superheater and boiler components
- Corrosion-resistant piping in power plants
Quality Assurance and International Compliance
To ensure consistent performance and full traceability, all Seamless Incoloy 925 Tubes are supplied with comprehensive quality documentation and testing reports.
Certification | Description |
Material Test Certificates | Fully compliant with EN 10204 3.1 / 3.2 certification |
Material Verification | 100% PMI (Positive Material Identification) and raw material traceability |
Testing Reports | Third-party inspection (TPI), ultrasonic testing (UT), and hydrostatic pressure testing |
Compliance Documentation | Heat treatment charts, dimensional inspection, and surface roughness (Ra) reports |
Laboratory Validation | Testing conducted by government-approved laboratories with full NDT reports |