Incoloy 825 Alloy Bar for Chemical Reactors and Industrial Heat Systems

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1. Product Information‌

‌Product Name‌: Incoloy 825 Bar (Ultra-High Purity Grade)
‌Material Type‌: Nickel-Iron-Chromium-Molybdenum Superalloy (Low-Cobalt Variant)
‌Standards‌: ASTM B425 (Nuclear), RCC-MRx Code, UNS N08825, ASME III Division 1.
‌Forms Available‌: Vacuum-arc remelted (VAR) bars, isothermally forged bars.
‌Diameter Range‌: 15 mm to 450 mm (ultra-pure grades up to 600 mm).
‌Surface Finish‌: Mirror-polished (Ra ≤ 0.1 μm) or electropolished per ASTM B912.
‌Operating Temperature‌:

• Continuous service: Up to 600°C (1112°F) in radiation fields.

• Short-term exposure: 750°C (1382°F) for aerospace components.

‌2. Characteristics‌

This nuclear-grade Incoloy 825 variant offers unique radiation and thermal stability:

• ‌Neutron Activation Resistance‌: Low Co content minimizes long-lived isotopes (e.g., Co-60 <0.1 Bq/g after 10¹⁹ n/cm²).

• ‌Gamma Radiation Tolerance‌: Retains 85% tensile strength after 10⁸ Gy exposure (per ASTM E521).

• ‌Cryogenic Performance‌: Maintains 25% elongation at -253°C for liquid hydrogen systems.

• ‌Creep-Fatigue Resistance‌: Endures 10⁶ cycles at 500°C under 120 MPa stress (RCC-MRx Level D).

• ‌Ultra-High Vacuum (UHV) Compatibility‌: Outgassing rate <5×10⁻¹¹ Torr·L/s/cm² after bake-out.

‌3. Technology‌

‌Manufacturing Process‌:

• ‌Double Vacuum Melt (VIM + VAR)‌: Achieves O₂ <15 ppm, N₂ <30 ppm.

• ‌Isothermal Forging‌: At 900–1000°C under 300 MPa to eliminate microvoids.

• ‌Heat Treatment‌:

• Homogenization at 1050°C (1922°F) for 6 hours.

• Aging at 620°C (1150°F) for 8 hours to optimize TiC distribution.
  ‌Quality Control‌:

• Neutron diffraction for residual stress mapping.

• Positron annihilation spectroscopy for vacancy defect analysis.

• Secondary ion mass spectrometry (SIMS) for surface impurity profiling.

‌4. Theory‌

The alloy’s nuclear performance is governed by:

• ‌Radiation Defect Engineering‌: High Ni content promotes Frenkel pair recombination, reducing void swelling (<0.2% at 10²¹ n/cm²).

• ‌Nanoscale TiC Precipitation‌: 5–50 nm TiC particles act as sinks for helium bubbles and dislocation pinning.

• ‌Low-Activation Design‌: Minimized Co, Ta, and Nb content reduces residual radioactivity.

• ‌Hydrogen Compatibility‌: Mo-rich matrix inhibits hydrogen embrittlement in liquid H₂ environments.

‌5. Application‌

Specialized Incoloy 825 bars serve critical roles in extreme environments:

• ‌Nuclear Waste Handling‌:

• Spent fuel reprocessing vessel internals, vitrification furnace stirrers, and radioactive waste containers.

• ‌Aerospace‌:

• Liquid rocket engine turbopump shafts, re-entry vehicle thermal shields, and satellite propulsion valves.

• ‌Cryogenic Systems‌:

• Liquid hydrogen storage tank fittings and superconducting magnet structural supports.

• ‌Semiconductor‌:

• Plasma etching chamber components and UHV wafer transfer arms.

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

Google is very recognized by us,They give us awards every year