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Inconel 825

Special Products

Inconel 825

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Inconel 825 is a titanium-stabilised, fully austenitic nickel-iron-chromium alloy with added molybdenum, copper, and titanium. It offers exceptional resistance to both reducing and oxidizing acids, stress-corrosion cracking, pitting, and crevice corrosion. Inconel 825 is widely used in chemical processing, nuclear fuel reprocessing, and pollution control applications, particularly where strong corrosion resistance is required in aggressive environments.

Key Features

  • Corrosion Resistance: Excellent resistance to sulfuric, phosphoric, nitric, and organic acids, as well as alkalis.
  • Oxidation Resistance: Protects against both oxidizing and reducing conditions.
  • Stress-Corrosion Cracking Resistance: Maintains structural integrity in chloride-rich and acidic conditions.
  • Good Mechanical Strength: Retains strength and toughness at both room and elevated temperatures.
  • Stabilized with Titanium: Improves resistance to sensitization and intergranular corrosion after welding.

Chemical Composition

Element

Composition (%)

Nickel (Ni)

38.0 – 46.0

Chromium (Cr)

19.5 – 23.5

Iron (Fe)

Balance

Molybdenum (Mo)

2.5 – 3.5

Copper (Cu)

1.5 – 3.0

Titanium (Ti)

0.6 – 1.2

Manganese (Mn)

≤ 1.0

Silicon (Si)

≤ 0.5

Carbon (C)

≤ 0.05

Aluminum (Al)

≤ 0.2

Sulfur (S)

≤ 0.03

 

Mechanical Properties

Property

Value

Tensile Strength

≥ 585 MPa

Yield Strength (0.2% Offset)

≥ 220 MPa

Elongation

≥ 30%

Hardness

~150 HB

Operating Temperature Range

-196°C to 540°C

 

Applications

  • Chemical Processing: Heat exchangers, tanks, and piping in sulfuric and phosphoric acid service.
  • Marine Industry: Piping and components exposed to seawater and harsh marine environments.
  • Pollution Control: Scrubbers, stack liners, and ducting systems for flue gas desulfurization.
  • Nuclear Fuel Reprocessing: Handling of radioactive and acidic materials.
  • Oil & Gas: Sour gas well components, piping systems, and heat exchangers.
Forms Available
  • Sheets & Plates: Used in high-temperature structural components and cladding applications.
  • Bars & Rods: Ideal for machining into custom components for aerospace and oil & gas sectors.
  • Pipes & Tubes: Employed in high-pressure fluid transport systems across the power and chemical industries.

Equivalent Grades

Standard

Equivalent Grade

UNS

N08825

W.Nr

2.4858

ASTM

B424, B705, B564

ASME

SB-424, SB-705, SB-564

 

Advantages

  • Broad corrosion resistance in diverse acidic environments.
  • Excellent fabrication and weldability characteristics.
  • Maintains mechanical properties across a wide temperature range.
  • Strong resistance to localized corrosion and intergranular attack.

Surface Finish and Coatings

To enhance durability:
  • Standard finishes include polished or pickled surfaces.
  • Coatings such as epoxy or anti-corrosion layers can be applied for specific requirements.

Quality Assurance & Packaging

High-quality standards are maintained throughout the manufacturing process:
  • Certifications: Compliant with ASTM B424/B705/B564 and related standards.
  • Packaging: Pipes and components are securely packaged with protective materials like wooden crates, plastic wrap, and end caps to prevent transit damage.
Connect with Riyaarth Overseas to source premium Inconel 825 materials engineered for performance, delivered with precision, and backed by technical expertise.

FAQ's

What industries benefit most from using Inconel 825?

Industries such as chemical processing, nuclear reprocessing, and pollution control rely on Inconel 825 for its superior corrosion resistance.

How does Inconel 825 compare to Inconel 625?

While both offer corrosion resistance, Inconel 825 is better suited for acid-based environments, whereas Inconel 625 excels in high-strength, high-temperature applications.

Can Inconel 825 be welded?

Yes, it offers good weldability and does not require post-weld heat treatment under normal conditions.

Products

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