Incoloy 925: Complete Properties & Application Guide

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Overview

Incoloy 925 (UNS N09925) is an age-hardenable nickel-iron-chromium alloy with additions of molybdenum, copper, titanium, and aluminum. It combines high strength with excellent corrosion resistance, particularly in sour gas environments containing hydrogen sulfide.

Chemical Composition

The chemical composition of Incoloy 925 is carefully controlled to achieve its unique combination of properties and performance characteristics.

Element	Min %	Max %
Nickel (Ni)	42.0	46.0
Iron (Fe)	22.0	Balance
Chromium (Cr)	19.5	22.5
Molybdenum (Mo)	2.50	3.50
Copper (Cu)	1.50	3.00
Titanium (Ti)	1.90	2.40
Aluminum (Al)	0.10	0.50
Carbon (C)	—	0.03

Mechanical Properties at Room Temperature

The mechanical properties of Incoloy 925 vary depending on product form and heat treatment condition. The data below represents typical values for solution-annealed material.

Property	Value
Tensile Strength	965 MPa
Yield Strength (0.2% offset)	760 MPa
Elongation in 2 inches	18%
Density	8.05 g/cm3
Melting Point	1340 °C
Max Service Temperature	540 °C

Corrosion Resistance

Excellent resistance to sulfide stress cracking in sour gas environments. Good resistance to pitting and crevice corrosion due to molybdenum content. Resistant to sulfuric and phosphoric acids due to copper addition. Meets NACE MR0175 requirements for oilfield service.

Applications

The unique combination of properties makes Incoloy 925 suitable for a wide range of demanding applications:

• Oil & Gas: Downhole tubing, casing, and wellhead components for sour gas service.
• Valves and Pumps: Valve stems, pump shafts, and pressure-containing components.
• Fasteners: High-strength bolting for corrosive environments.
• Marine: Propeller shafts and fasteners for seawater applications.
• Chemical Processing: Process equipment handling sulfuric and phosphoric acids.

Available Product Forms

Hangbo Alloy Group manufactures and supplies Incoloy 925 in the following product forms, conforming to ASTM, AMS, and ASME specifications:

• Round Bars: Diameters from 6 mm to 300 mm, hot-finished or cold-drawn, solution annealed.
• Seamless Tubes & Pipes: Sizes from 6 mm OD to 219 mm OD, various wall thicknesses.
• Plates & Sheets: Thicknesses from 0.5 mm to 50 mm, hot-rolled or cold-rolled.
• Forgings: Custom flanges, rings, discs, and complex shapes per customer drawing.
• Welding Wire: Diameters 0.8 mm to 5.0 mm, precision-wound coils and spools.

Related Standards

Standard	Description
API 6A	Wellhead and Christmas Tree Equipment
NACE MR0175	Sulfide Stress Cracking Resistant Material
ASTM B637	Forgings
AMS 7241	Bar
ASTM B805	Specification for Alloy 925
ASME SB-637	Pressure Vessel Code

Contact Us for Incoloy 925

Hangbo Alloy Group maintains extensive inventory of Incoloy 925 in all standard product forms. We can provide mill test certificates, third-party inspection reports (SGS, TUV), and custom processing services.

For quotations, material certifications, or technical consultation, contact our sales team or call +86-136-1165-6360. We typically respond within 10 minutes.