Incoloy 925 (N09925)

What is Incoloy 925 and its applications?

Incoloy 925 (UNS N09925) is an age-hardenable nickel-iron-chromium alloy with molybdenum, copper, titanium and aluminum. Published uses include downhole and surface gas-well components, marine hardware and fasteners.

Gas-well equipment: Valves, hangers, tool joints and packer components.
Marine equipment: Shafting and corrosion-exposed mechanical hardware.
Fasteners: Connections requiring a specified high-strength condition.

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Engineering Application & Selection Guide

Titanium and aluminum enable precipitation strengthening during heat treatment. Compare strength and corrosion performance for the selected condition, product form and processing route rather than transferring the properties of Incoloy 825.

Incoloy 925 stud bolts — For wellhead connections, state heat treatment, hardness, fluid chemistry and the governing sour-service requirements.
Incoloy 925 hex bolts — For marine joints, review load capacity and environmental cracking before reducing fastener size.
Incoloy 925 socket head cap screws — For downhole assemblies, define thread-root geometry and any fatigue or toughness acceptance requirements.

Use the 825 and 925 material comparison to separate an age-hardenable selection from a solid-solution alternative. Sour-service acceptance depends on the applicable material restrictions and actual environment, not the grade name alone.

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Incoloy 925 Composition

Composition limits · wt.%

ElementWeight %

Ni: 42–46%
Cr: 19.5–22.5%
Mo: 2.5–3.5%
Ti: 1.9–2.4%
Cu: 1.5–3.0%
Fe: ≥22%
C: ≤0.03%
Mn: ≤1.0%
P: ≤0.03%
S: ≤0.03%
Si: ≤0.50%
Nb: ≤0.50%
Al: 0.10–0.50%

ASTM / ASME specifications by product form

Finished-product requirements

Specify the finished-fastener mechanical requirements, condition and inspection separately from the starting-stock specification.

Incoloy 925 hex bolt requirements ↗

Fasteners · dimensional references

Product	Reference
Hex bolts	ISO 4014 / ISO 4017 · ASME B18.2.1
Threaded studs	DIN 976-1 · ASME B18.31.2
Hex nuts	ISO 4032 · ASME B18.2.2
Socket head screws	ISO 4762 · ASME B18.3
Flat washers	ISO 7089 / ISO 7090 · ASME B18.21.1
Custom fasteners	Customer drawing

Raw-material specifications

Product form / scope	Reference
Pressure-vessel reference	ASME Code Case 2218, Section VIII Division 1
Rod, bar & forging stock · Catalogue-listed reference; state the required grade and revision.	ASTM B637

Dimensions do not define material or finished-part compliance. Specify the grade, condition and applicable requirements.

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Incoloy 925 Mechanical Properties

Reference sample and condition

Data basis: Catalogue reference minimums
Gauge length: A5, as labelled in supplied table

Key properties	Value
Tensile strength	≥965 MPa
0.2% yield strength	≥758 MPa
Elongation	≥18%

Supplied technical reference · Scanned PDF page 5 · printed page 17

Procurement and application guide

Specify the material and final condition

State the heat treatment and any sour-service requirements separately.

Material forms in the technical reference: Round bar · Flat bar · Tube · Forging stock.

Define the finished-part acceptance

Include the material or bolting specification, required final condition, dimensions and quantity. State the service medium, temperature and loading where known. Agree the required tests, inspection coverage and acceptance criteria for the finished part.

Start with the information you have

Send a drawing or share the product form and dimensions. Identify any undecided requirements for review rather than copying a typical property value into the purchase order.

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