Incoloy® 925

Nickel alloy INCOLOY® 925 – properties, applications and technical data

INCOLOY Alloy 925 is an age-hardenable nickel-iron-chromium alloy with additions of molybdenum, copper, titanium and aluminium.

The alloy is developed to combine high strength with very good corrosion resistance in aggressive environments, especially in the oil and gas industry.

The material is often used in applications where components are exposed to high mechanical stress, chlorides, acidic environments and hydrogen sulphide-containing media.

Properties of INCOLOY Alloy 925

INCOLOY 925 is a nickel-based alloy where the nickel content provides good resistance to chloride-induced stress corrosion cracking and where the combination of molybdenum and copper improves resistance to reducing chemicals.

Molybdenum contributes to good resistance to pitting and crevice corrosion, while chromium provides protection in oxidizing environments. Additions of titanium and aluminum make the alloy age-hardenable and provide high strength after heat treatment.

• Type: Age-hardenable nickel-iron-chromium alloy
• Alloy: Ni-Fe-Cr-Mo-Cu-Ti-Al
• Structure: Age-hardenable austenitic nickel-based alloy
• Designations: INCOLOY Alloy 925, Alloy 925, UNS N09925
• Typical composition: Ni ~42–46%, Cr ~19.5–23.5%, Mo ~2.5–3.5%, Cu ~1.5–3.0%, Ti ~1.9–2.4 %

Advantages

• High strength after age hardening
• Very good resistance to chloride-induced stress corrosion cracking
• Good resistance to sulfide stress in acidic environments
• Good resistance to pitting and crevice corrosion
• Very good corrosion resistance in both oxidizing and reducing environments

Limitations

• Higher material cost than standard stainless steels and simpler nickel-based alloys
• Machining can be more demanding after hardening
• Heat treatment is required to achieve full strength

Common product forms for Alloy 925

• Round Bar
• Pipe and Tube
• Forgings
• Fasteners
• Special Dimensions According to Drawing

Typical Components Made in Alloy 925

• Valves and Valve Components
• Hangers and Landing Nipples
• Packers and Tool Joints
• Marine Shafts and Pump Shafts
• High Strength Piping Systems
• Fasteners for Corrosive Environments

Corrosion Resistance

INCOLOY Alloy 925 offers very good resistance to sulfide stress and stress corrosion cracking in acid oil and gas environments containing hydrogen sulfide.

The alloy also has good resistance to pitting, crevice corrosion and reducing chemical environments, making it suitable for demanding offshore and process applications.

Environments where Alloy 925 performs well

• Oil and gas production
• Acid environments with hydrogen sulfide
• Marine environments
• Chloride-containing process environments
• High-strength corrosion-demanding piping systems

Environments to avoid

• Applications where simpler alloys provide adequate performance
• Environments where high-temperature strength is more important than corrosion resistance

Technical data (age-hardened condition)

With a global network of suppliers, we can offer INCOLOY Alloy 925 in engineering dimensions for demanding oil, gas and industrial applications.

Contact us for pricing, availability and technical advice.

Supplier of Alloy 925 with certified quality

HARALD PIHL is one of Europe's largest suppliers of special alloys, including high-performance nickel-based alloys such as INCOLOY Alloy 925.

With over 100 years of experience in the metal industry, we deliver materials with full traceability and certification according to EN 10204 3.1 / 3.2 as well as relevant ASTM and ISO standards.

Cutting, testing and quality assurance are carried out in-house to ensure the right tolerances and fast global delivery for technically demanding projects.

• Europe's largest stock of nickel and titanium alloys
• Nickel-based special alloys from stock
• ASTM / ISO standards
• Top quality for safety-critical applications
• Fast global delivery
• Full material certification (EN 10204 3.1 / 3.2)
• Over 100 years in the metal industry
• Nickel and titanium experts