Incoloy 925 High Performance Alloy Strip for High-Temperature and Corrosion-Resistant Applications

1. Product Information‌

• ‌Alloy Designation‌: Incoloy 925 (UNS N09925 / W.Nr. 2.4852)

• ‌Certifications‌:
  NACE MR0175/ISO 15156-3 (Sulfide Stress Corrosion Cracking), API 6ACRA

• ‌Chemical Composition‌ (wt%):
  Ni 42-46%, Cr 19.5-23.5%, Mo 2.5-3.5%, Cu 1.5-3.0%, Ti 1.9-2.4%, Al 0.1-0.5%, C ≤0.03%, Fe Balance

• ‌Dimensional Specifications‌:
  Thickness: 0.2–15 mm (±0.4% or ±0.01 mm), Width: 50–1,500 mm (longitudinal bow ≤0.3 mm/m)

• ‌Supply Conditions‌:
  Solution annealed (1,040°C ±15°C, water quench), aged (620°C/8h, air cool), or cold-rolled (H1150M temper)

‌2. Key Characteristics‌

• ‌Extreme Corrosion Resistance‌:

• Resistance to H₂S stress corrosion cracking (SSC) at 150°C/20% NaCl, threshold stress ≥80% AYS (per NACE TM0177 Method A).

• Pitting Resistance Equivalent Number (PREN) = 38.5 (Cr + 3.3Mo + 16N).

• ‌Mechanical Strength‌:

• Aged condition: Tensile strength ≥1,000 MPa, yield strength ≥750 MPa, elongation ≥15%.

• Impact toughness: 75 J at -46°C (ASTM E23).

• ‌Thermal Stability‌:

• Retains 85% yield strength after 1,000h exposure at 400°C in sour gas environments.

• ‌Fatigue Performance‌:

• Fatigue strength (R=-1): 450 MPa at 10⁶ cycles (ASTM E466).

‌3. Advanced Manufacturing Technology‌

• ‌Triple Melt Process‌:
  VIM + ESR + VAR refining ensures ultra-low impurities:

• Oxygen ≤15 ppm, sulfur ≤0.001%, non-metallic inclusions ≤0.5% area fraction.

• ‌Precision Rolling‌:

• Cryogenic rolling at -50°C enhances dislocation density, achieving nano-twinned structures (spacing 10-50 nm).

• Eddy current sensors monitor residual stress (±50 MPa uniformity).

• ‌Surface Treatment‌:

• Electropolishing (Ra ≤0.1 μm) or HVOF-sprayed WC-10Co-4Cr coating (800-1,200 HV).

• ‌Heat Treatment‌:

• Two-stage aging: 720°C/8h + 620°C/8h for optimal γ' (Ni₃(Ti,Al)) precipitation.

‌4. Material Science Principles‌

• ‌Precipitation Strengthening‌:

• ‌γ' Phase Control‌: Ti/Al ratio maintained at 4.5-5.0 to form coherent Ni₃(Ti,Al) precipitates (size 10-30 nm, volume fraction 18-22%).

• ‌Secondary Phases‌: MC carbides (TiC, NbC) at grain boundaries suppress intergranular corrosion.

• ‌Corrosion Protection Mechanism‌:

• Mo-Cu synergy creates a self-repairing passive film (MoO₄²⁻/Cu₂O layer) under chloride attack.

• Nickel matrix maintains stability in reducing acids (HCl, H₂S) via thermodynamic immunity.

• ‌Hydrogen Embrittlement Mitigation‌:

• TiN particles act as hydrogen traps, reducing diffusible hydrogen content to <0.5 ppm.

‌5. Critical Applications‌

• ‌Oil & Gas Extraction‌:

• Downhole tool components (sour wells with H₂S >5%, CO₂ partial pressure >10 MPa).

• Subsea Christmas tree valves (30-year design life in seawater + H₂S environments).

• ‌Chemical Processing‌:

• Reactor internals for HCl acid regeneration (concentration up to 33%, 180°C).

• Flue gas desulfurization (FGD) system dampers (pH 1-3, 80°C wet-dry cycling).

• ‌Marine Engineering‌:

• Seawater pump shafts (resistant to cavitation erosion, ASTM G32 mass loss <0.1 g/h).

• Offshore platform tensioner systems (fatigue life >2×10⁷ cycles @ 200 MPa).

• ‌Nuclear Waste Management‌:

• Spent fuel reprocessing vessel liners (resistant to HNO₃ + HF mixtures at 90°C).

• ‌Specialty Manufacturing‌:

• Geothermal wellhead connectors (H₂S/CO₂/Cl⁻ multi-threat corrosion resistance).

• Hydrogen compressor valve plates (1,500 bar cyclic loading, hydrogen permeation <1×10⁻¹⁰ mol/m·s·Pa)

6. Parameters

Our Advantage

1. Market Leader

Top 5 in China's nonferrous metal industry

2. Flexible products

Thousands of product specifications,Meet multiple needs of buyers

3. Low MOQ

Can customize samples

4. Short production lead time，fast delivery of whole cabinet

5. Professional inspection equipment

Before delivery, we will use spectrometers, tensile testers and other professional equipment to conduct a comprehensive inspection of the products to ensure that the goods are qualified for acceptance

6. Professional business team

Quickly responds to customer inquiries,24-hour professional quotation online

The salesperson will follow the customer's requirements for the use of the product,Professionally recommend more appropriate performance and price products to customers

7. Intact packaging

Packaging according to customer needs.You can customize wooden boxes to ensure that the goods arrive at the destination in good condition

8. Various payment methods

Facilitate customer payment

9. Get good reviews from customers

Old customers have long-term cooperation,The longest is more than 7 years

10. Received various awards

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