Seamless Incoloy 925 Nickel Alloy Steel Tube(UNS N09925) is a high-strength, corrosion-resistant nickel-iron-chromium alloy with additions of molybdenum, copper, titanium, and aluminum. Often referred to as a "nickel alloy steel" in industrial contexts due to its iron content, it is a precipitation-hardenable superalloy designed for exceptional strength and resistance to aggressive environments, particularly in sour gas and high-chloride conditions. Seamless Incoloy 925 tubes are used in demanding applications like oil and gas production, marine environments, and chemical processing, where high mechanical strength and corrosion resistance are critical. The seamless construction ensures reliability under high pressure and temperature without weld imperfections.
Seamless Incoloy 925 Nickel Alloy Steel Tube Overview
Chemical
|
Nickel (Ni) |
38.0–46.0 |
|
Chromium (Cr) |
19.5–23.5 |
|
Iron (Fe) |
Balance (22.0 min) |
|
Molybdenum (Mo) |
2.5–3.5 |
|
Copper (Cu) |
1.5–3.0 |
|
Titanium (Ti) |
1.9–2.4 |
|
Aluminum (Al) |
0.1–0.5 |
|
Carbon (C) |
0.03 max |
|
Manganese (Mn) |
1.0 max |
|
Silicon (Si) |
0.5 max |
|
Phosphorus (P) |
0.03 max |
|
Sulfur (S) |
0.03 max |
Mechanical
|
Tensile Strength |
965 MPa (140 ksi) min |
|
Yield Strength (0.2% offset) |
724 MPa (105 ksi) min |
|
Elongation |
25% min |
|
Hardness (Rockwell C) |
38 max |
|
Density |
8.08 g/cm³ |
|
Melting Point |
1311–1366°C (2392–2491°F) |
Applications
- Oil and gas: Downhole tubing, casing, and completion equipment in sour gas wells.
- Marine: Shafts, fasteners, and components exposed to seawater.
- Chemical processing: Heat exchangers, piping for corrosive fluids.
- Aerospace: High-strength components requiring corrosion resistance.
Notes
- Heat Treatment: Solution annealing at 980–1010°C followed by age-hardening at 732–760°C optimizes strength and corrosion resistance.
- Standards Compliance: Meets NACE MR0175/ISO 15156 for sour service in oil and gas.
- Sourcing: Check with suppliers for mill test certificates (MTC) and third-party inspections.
