Products Features
Excellent resistance to sulfide stress corrosion cracking
In acidic oil and gas well environments containing H₂S, INCOLOY 925 exhibits excellent resistance to sulfide stress corrosion cracking (SSC) and hydrogen embrittlement, meeting the requirements of NACE MR0175 / ISO 15156 for the highest grade alloy intended for use in acidic environments.
Ultra-high strength and good toughness
Through precipitation hardening heat treatment, INCOLOY 925 can achieve a yield strength of up to 965 MPa or higher, while maintaining excellent ductility, toughness, and impact resistance, making it suitable for high-load underground tools and wellhead components.
Excellent resistance to pitting and crevice corrosion
Chromium and molybdenum content endows the alloy with excellent pitting resistance equivalent (PREN ≈ 38) in chloride-containing environments, making it suitable for harsh corrosive conditions such as seawater, acidic brines, and oilfield produced water.
Machining and welding properties
It can be subjected to hot working, cold working, and welding using conventional processes. It is suitable for manufacturing complex-shaped downhole tools, valve components, and pipeline systems.
Technical Specifications
Chemical Composition
|
Element |
Standard Requirements |
Notes |
|
Ni |
42.0 - 46.0% |
Matrix elements that provide resistance to chloride ions and acidic media |
|
Cr |
19.5 - 22.5% |
Provide antioxidant and corrosion resistance capabilities, enhancing the stability of the passivation film |
|
Fe |
Surplus (approximately 22-27%) |
Structural support to reduce costs |
|
Mo |
2.5 - 3.5% |
Significantly improve resistance to pitting corrosion and crevice corrosion |
|
Cu |
1.5 - 3.0% |
Enhance resistance to corrosion by reducing acids such as sulfuric acid |
|
Ti |
1.9 - 2.4% |
Precipitation strengthening forms the γ' phase |
|
Al |
0.1 - 0.5% |
Precipitation strengthening, assisting in the formation of γ' phase |
|
C |
≤ 0.03% |
Strictly control to prevent intergranular corrosion. |
|
Si |
≤ 0.50% |
Oxygen absorber |
|
Mn |
≤ 1.00% |
Deoxidizer, improve hot working properties |
|
P |
≤ 0.030% |
Impurity elements |
|
S |
≤ 0.030% |
Prevent hot brittleness |
Physical Properties
|
Property |
Value/Range |
Test Conditions |
|
Density |
8.14g/cm³ |
Room temperature (20°C) |
|
Melting Point |
1310 - 1360°C |
- |
|
Coefficient of Thermal Expansion (20-100°C) |
13.0 × 10⁻⁶ /K |
- |
Mechanical Properties (Annealed Condition, Typical Values)
|
Property |
Typical Value |
Specification |
|
Tensile Strength |
≥ 965 MPa |
ASTM B805 / B637 |
|
Yield Strength (0.2% Offset) |
≥ 690 MPa |
ASTM B805 / B637 |
|
Elongation |
≥ 20% |
ASTM B805 / B637 |
|
Hardness |
26-40 HRC |
- |
High-temperature performance
Below 450°C, the alloy still maintains good mechanical properties and corrosion resistance.
Long-term operating temperature range: Recommended -200°C to 450°C.
Resistance to Sulfide Stress Corrosion Cracking (SSC): Meets the highest level requirements of NACE MR0175/ISO 15156 for acidic oil and gas field environments, exhibiting no SSC sensitivity under conditions of pH 3.0-4.5 and H₂S partial pressures up to 10 bar.
Pitting Corrosion Resistance: PREN (Pitting Resistance Equivalent) = %Cr + 3.3×%Mo + 16×%N ≈ 38, which exhibits excellent pitting corrosion resistance in chloride-containing environments.
Applicable corrosive media:
Acidic oil and gas well media containing H₂S/CO₂
Chloride solutions (seawater, brine)
Reducing acids (dilute sulfuric acid)
Alkaline solutions
Organic acids
INCOLOY 925 is specifically designed for extreme acidic oil and gas environments and high-strength applications. It is recommended for use in the following areas:
Application Fields
-
Acidic Oil and Gas Wells: Downhole tools (packers, safety valves, couplings), tubing hangers, pump shafts
-
Surface and Downhole Valves: Valve bodies, valve stems, seals, Christmas tree components
-
Acidic Medium Handling Equipment: Heat exchangers, vessels, piping systems
-
Chemical Processing Equipment: Reactors, distillation columns (including H₂S environments)
-
Offshore Engineering: Seawater pipelines, pumps and valves, fasteners (requiring high strength corrosion resistance)
-
Refineries: High-sulfur crude processing units, hydrocracking equipment
-
Geothermal Power Generation: Geothermal well casings and related equipment
-
Nuclear Industry: High-strength fasteners, corrosion-resistant structural components
Delivery and Customization
We offer flexible and reliable supply chain solutions to ensure you receive INCOLOY 925 materials that perfectly match your project requirements.
|
Form |
 Sheet/Plate
|
 Bar/Rod
|
 Seamless Pipe
|
 Strip/Sheet Coil
|
 Wire/Wire Rod
|
|---|---|---|---|---|---|
|
Conventional Range |
Thickness: 0.5 - 100 mm |
Diameter Φ6-500mm |
Outer diameter Φ10-300mm |
Thickness: 0.1 – 3.0 mm |
Diameter Φ0.5-10mm |
|
Customization Capability |
Special thick/thin rolling, ultra-wide plates; special surface treatment, fixed-length cutting |
Large-sized forged bars (up to Φ800 mm), special-shaped bars, and various heat treatment conditions |
Large-diameter thick-walled pipes, special alloy composition; Pipe end processing (beveling, fixed length) |
Different hardness conditions, special heat treatments (stabilization treatment, grain size control), acid-washed surfaces, electrolytic polishing, coatings, or special protective films |
Special surface treatment, precision drawing |
Why Choose Us? - Reliable engineering technology. Dependable delivery.
We are not just a supplier, but a trusted materials partner for you in China.
Vertically Integrated Production
Own 20,000㎡ facility with 10+ automated lines (8,000+ tons/year). In-house tooling & die center enables rapid customization and effective cost control - no middleman markup.
Strict Quality Control at Every Stage
Full traceability across key QC checkpoints throughout production. 100% compliant with ASTM/ASME, EN, and GB standards. Material test reports available with every shipment.
Reliable Delivery & Export Packaging
10+ years exporting to Europe, North America, Southeast Asia & Middle East with waterproof and anti-rust protection, combined with flexible shipping options ensures safe and on-time arrival.
Sample Validation Before Mass Production
We provide free samples for quality verification, allowing you to place bulk orders only after approval. We ensure consistency from sample to mass production by accurate dimensional measurement and transparent manufacturing.
FAQ
Q: What are the main advantages of INCOLOY 925?
Q: What heat treatment is required for INCOLOY 925?
Q: What is the maximum operating temperature?
Q: What is the difference from Inconel 718 ?
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