Incoloy 925 rod represents a premium age-hardenable nickel-iron-chromium alloy specifically developed for demanding oilfield applications. This unique material combines exceptional corrosion resistance with high mechanical strength, making it ideal for critical fasteners and downhole components in sour gas and high-pressure drilling environments. The age-hardening capability allows for tailored mechanical properties to meet specific operational requirements in extreme conditions.
Material Composition and Key Properties
The alloy's specialized chemistry (Ni-42%, Fe-28%, Cr-21%, Mo-3%, Cu-2%, Ti-2%) provides:
Excellent strength-to-weight ratio after age hardening (up to 1200 MPa tensile strength)
Outstanding resistance to sulfide stress cracking (SSC) in sour gas environments
Superior corrosion resistance in chloride-containing media
Good resistance to pitting and crevice corrosion
Maintained toughness at both high and low temperatures
Primary Applications
Oil & Gas Drilling Components:
High-strength fasteners for wellhead equipment
Downhole tool components and mandrels
Drill string accessories in sour service
Christmas tree and valve components
Subsea Equipment:
Connectors and couplings for deepwater applications
Bolting systems for subsea trees
Pipeline end terminations
ROV intervention tooling
Specialty Fasteners:
High-performance bolting for refinery equipment
Critical fasteners for sour gas processing
Corrosion-resistant studs and nuts
Flange connection systems in aggressive environments
User Benefits and Selection Criteria
Oilfield engineers specify Incoloy 925 rods for:
Superior mechanical properties achievable through age hardening
Proven reliability in sour gas and high-pressure applications
Excellent corrosion resistance compared to conventional high-strength steels
Weight savings versus solid nickel alloys
Cost-effectiveness relative to more exotic materials
Technical Specifications
Complies with UNS N09925, ASTM B805 (rod product)
Typical age-hardened tensile strength: 1000-1200 MPa
Yield strength: 850-1000 MPa after heat treatment
Excellent impact toughness even at sub-zero temperatures
NACE MR0175 compliant for sour service applications
Material Advantages Over Alternatives
Higher strength potential than Incoloy 825/925 in annealed condition
Better SSC resistance than high-strength low-alloy steels
More cost-effective than Inconel 718 for many applications
Superior corrosion resistance to precipitation-hardened stainless steels
Better high-temperature capability than martensitic stainless steels
Application field
High temperature components, such as turbine blades, guide vanes, turbine disks, high pressure compressor disks, machine manufacturing and combustion chambers used in the manufacture of aviation, naval and industrial gas turbines.
Item | 800 | 800H | 800HT | 825 | 925 |
C | ≤0.1 | 0.05-0.1 | 0.06-0.1 | ≤0.05 | ≤0.03 |
Mn | ≤1.5 | ≤1.5 | ≤1.5 | ≤1 | ≤1 |
Fe | rest | rest | rest | rest | rest |
P | -- | -- | -- | ≤0.02 | ≤0.03 |
S | ≤0.015 | ≤0.015 | ≤0.015 | ≤0.03 | ≤0.03 |
Si | ≤1 | ≤1 | ≤1 | ≤0.5 | ≤0.5 |
Cu | ≤0.75 | ≤0.75 | ≤0.75 | 1.5-3 | 1.5-3 |
Ni | 30-35 | 30-35 | 30-35 | 38-46 | 42-46 |
Al | 0.15-0.6 | 0.15-0.6 | 0.15-0.6 | 0.2-1 | 0.15-0.5 |
Ti | 0.15-0.6 | 0.15-0.6 | 0.15-0.6 | 0.6-1.2 | 1.9-2.4 |
Cr | 19-23 | 19-23 | 19-23 | 19.5-23.5 | 19.5-23.5 |
Mo | -- | -- | -- | 2.5-3.5 | 2.5-3.5 |
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