Incoloy 925 Alloy Bar for High Temperature Pressure Vessels and Industrial Applications

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‌1. Product Information‌

‌Product Name‌: Incoloy 925 Bar (Seawater Corrosion Resistant Grade)
‌Material Type‌: Nickel-Iron-Chromium-Molybdenum-Copper Alloy (Precipitation-Hardenable)
‌Standards‌: ASTM B425, ASME SB425, UNS N09925, EN 10204 3.1
‌Forms Available‌: Hot-forged bars, cold-finished bars, and HIP-consolidated PM bars.
‌Diameter Range‌: 20 mm to 400 mm (marine grades up to 600 mm).
‌Surface Finish‌: Electropolished (Ra ≤ 0.4 μm), passivated per ASTM A967.
‌Heat Treatment‌:

• Solution Treatment: 900-925°C (1650-1700°F) + forced-air cooling

• Aging: 595°C (1100°F) × 8h + 650°C (1200°F) × 8h

‌Mechanical Properties‌:

• Yield Strength: 690-860 MPa (100-125 ksi)

• Impact Toughness: 75 J (55 ft-lb) at -40°C

‌2. Characteristics‌

This marine-grade Incoloy 925 variant excels in chloride-rich and acidic environments:

• ‌Seawater Corrosion Resistance‌: Pitting resistance equivalent number (PREN) >45.

• ‌Crevice Corrosion Immunity‌: Withstands 10,000 hours in stagnant seawater at 60°C.

• ‌Erosion-Corrosion Resistance‌: Material loss <0.02 mm/year in 3 m/s seawater flow.

• ‌Hydrogen-Induced Cracking (HIC) Resistance‌: Crack sensitivity ratio (CSR) <0.1% per NACE TM0284.

• ‌Phase Stability‌: No intermetallic phase formation after 5000 hours at 350°C.

• ‌Cryogenic Toughness‌: CVN impact energy >50 J at -100°C.

‌3. Technology‌

‌Manufacturing Process‌:

• ‌Hot Isostatic Pressing (HIP)‌: At 1150°C/150 MPa for 4 hours (PM grades).

• ‌Thermomechanical Processing‌: 20% cold working + aging for optimized dual-phase structure.

• ‌Surface Engineering‌:

• Laser shock peening (LSP) to induce 500 MPa compressive surface stress.

• Aluminizing diffusion coating (50 μm) for >1000°C oxidation protection.
  ‌Quality Control‌:

• Immersion testing in artificial seawater per ASTM G52.

• Scanning Kelvin probe (SKP) for localized corrosion potential mapping.

• 3D X-ray tomography for pore/defect analysis (<10 μm resolution).

‌4. Theory‌

The alloy’s marine performance stems from:

• ‌Multi-Phase Strengthening‌: γ' (Ni₃Ti) + ε (Cu-rich) phases provide 360° dislocation pinning.

• ‌Chloride Ion Passivation‌: MoO₄²⁻ complexes form protective film at pH 2-10.

• ‌Copper Redox Behavior‌: Cu⁺/Cu²+ redox cycling enhances repassivation kinetics.

• ‌Niobium Microalloying‌: Nb forms MC-type carbides that refine grain structure.

• ‌Hydrogen Trapping Mechanism‌: TiC particles (50-200 nm) immobilize diffusible hydrogen.

‌5. Application‌

Incoloy 925 bars solve critical challenges in harsh marine/chemical environments:

• ‌Offshore Engineering‌:

• Subsea connectors, ROV components, and seawater pump shafts.

• ‌Desalination‌:

• High-pressure reverse osmosis (RO) membrane housings and brine heater tubes.

• ‌Chemical Processing‌:

• Mixer shafts in HCl production, sulfuric acid concentrator internals.

• ‌Nuclear Waste Handling‌:

• Spent fuel reprocessing vessel agitators in nitric acid media.

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

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9. Get good reviews from customers

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

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