Name: Incoloy 925
Brand: Incoloy

Material Overview

Incoloy 925 material profile

A concise grade introduction for buyers who need to confirm composition, properties, standards, available forms and suitable applications before sending an inquiry.

Engineering profile

Incoloy 925 is commonly specified for oil and gas components requiring high mechanical strength together with resistance to sour production fluids, seawater and aggressive chemicals. This age-hardenable nickel-iron-chromium alloy contains molybdenum and copper for corrosion resistance and titanium and aluminum for precipitation strengthening. It is used for downhole tubular components, valves, hangers, landing nipples, tool joints, packers, wellhead equipment, high-strength fasteners, marine shafting, pump shafts and corrosion-resistant piping systems.

Technical data on this page is for material selection reference. Final acceptance values should be confirmed by the purchase standard, heat treatment condition, product form, size and material test certificate.

Chemical Composition

Incoloy 925 composition range

The following table shows common limiting composition values for Alloy 625 / UNS N06625. Actual product chemistry is reported by heat on the material test certificate.

Element	Symbol	Typical Requirement	Role in Incoloy 925
Nickel	Ni	42.0-46.0	Stabilizes the austenitic structure and provides resistance to chloride-ion stress corrosion cracking.
Iron	Fe	22.0 min	Balances the nickel-base matrix and contributes to the alloy’s mechanical and processing characteristics.
Chromium	Cr	19.5-22.5	Provides passivation and resistance to oxidizing environments and general corrosion.
Molybdenum	Mo	2.5-3.5	Improves resistance to pitting, crevice corrosion and reducing chemicals.
Copper	Cu	1.5-3.0	Improves resistance to sulfuric acid and other reducing environments.
Titanium	Ti	1.9-2.4	Combines with aluminum to produce gamma-prime precipitation strengthening.
Aluminum	Al	0.10-0.50	Supports the age-hardening reaction and development of high yield strength.
Niobium	Nb	0.50 max	Controlled minor element that may contribute to strengthening phases.
Carbon	C	0.030 max	Restricted to control carbide formation and intergranular corrosion behavior.
Manganese	Mn	1.0 max	Controlled minor alloying and deoxidizing element.
Silicon	Si	0.50 max	Controlled deoxidizing element and residual constituent.
Sulfur	S	0.030 max	Controlled impurity for hot-workability and mechanical performance.

Physical Properties

Key physical and thermal data

These values help customers compare density, thermal behavior, magnetic response and conductivity during early material selection.

Property	Metric Value	Imperial / Notes	Condition
Density	8.08 g/cm3	0.292 lb/in3	Room temperature
Melting Range	1311-1366 °C	2392-2490 °F	Typical range
Specific Heat	435 J/kg·°C	0.104 Btu/lb·°F	At approximately 20 °C
Thermal Conductivity	Approx. 12.0 W/m·°C	Approx. 83.1 Btu·in/ft2·h·°F	At approximately 23 °C
Electrical Resistivity	1.17 µΩ·m	701 ohm-cmil/ft	Room temperature
Dynamic Modulus of Elasticity	Approx. 199 GPa	Approx. 28.9 x 10³ ksi	Solution annealed and aged at approximately 21 °C
Mean Thermal Expansion	Approx. 13.2 x 10^-6/°C	Approx. 7.3 x 10^-6/°F	Between 25 and 100 °C
Relative Magnetic Permeability	Approx. 1.001	Essentially non-magnetic	At 200 oersteds

Mechanical Properties

Room-temperature mechanical properties

Mechanical properties vary with product form, size, processing route and heat treatment. The table below summarizes commonly referenced nominal values for material selection.

Product Form / Condition	Tensile Strength	Yield Strength, 0.2%	Elongation	Hardness / Notes
Round bar – solution annealed	Approx. 685 MPa	Approx. 271 MPa	Approx. 56%	Approx. Rockwell B 76
Round bar – solution annealed and aged	Approx. 1154 MPa	Approx. 832 MPa	Approx. 27%	Approx. Rockwell C 32
Cold-drawn tube – solution annealed and aged	Approx. 1189 MPa	Approx. 830 MPa	Approx. 27%	Approx. Rockwell C 35
Cold-worked bar – aged	965 MPa min	724 MPa min	18% min	Typical specification limits depend on diameter
Hot-worked bar – aged	965 MPa min	758 MPa min	18% min	Typical specification limits depend on diameter
Plate, sheet and strip – annealed	By ASTM B872 and purchase specification	By specification	By specification	Normally supplied annealed for subsequent forming and aging

For pressure equipment, aerospace parts or project-specific acceptance, use the minimum requirements in the specified ASTM, ASME, AMS, EN or customer drawing rather than nominal values.

Standards & Specifications

Common Incoloy 925 standards by product form

YSN128 can quote Alloy 625 products according to ASTM, ASME, AMS, EN, DIN, ISO or customer drawing requirements. Certificate scope can be matched to the purchase order.

Product Form	Common Standards	Typical Supply Item	Certificate / Inspection
Plate, Sheet, Strip	ASTM B872 or approved customer specification	Annealed plate, sheet, strip and cut blanks for subsequent fabrication and aging	EN 10204 3.1, chemical, mechanical and heat-treatment records
Rod, Bar, Wire	ASTM B805, ASTM B637 or project-specific oil and gas requirements	Round bar, flat bar, hexagon, rod, wire and machining stock	MTC, PMI, tensile test, hardness and dimensional inspection
Seamless Pipe & Tube	ASTM B983, API 5CRA / ISO 13680 where applicable, or customer specification	High-strength seamless tube, downhole tubing and mechanical tube	Hydrotest or electric test, mechanical test, hardness, PMI and MTC
Forgings	ASTM B637, API 6ACRA or approved equipment specification	Hangers, landing nipples, tool joints, valve parts and forging stock	Heat-treatment record, UT, mechanical test, hardness, PMI and MTC
Fasteners	API 20F, API 6ACRA, ASTM B805 or customer-approved bolting specification	Bolts, studs, nuts, screws, pins and pressure-control fasteners	Mechanical test, hardness, impact test, PMI and traceability records
Wellhead & Completion Components	API 6A, API 6ACRA and applicable purchaser specification	Wellhead parts, hangers, packers, valve stems and pressure-control components	NDT, hardness mapping, mechanical test, PMI and full heat traceability
Sour Oil & Gas Service	NACE MR0175 / ISO 15156 subject to material condition and environmental limits	Downhole and surface equipment exposed to H2S-containing production fluids	Environmental review, hardness control, SSC/SCC qualification and purchaser approval
Pressure Equipment	Applicable ASME Code Case and project design specification	High-strength piping and pressure-containing components	Code-required testing, NDT, heat-treatment documentation and MTC
Welding Products	Project-qualified Alloy 725 filler-metal specification	725NDUR-type filler wire for GTAW or GMAW	Mill certificate, chemistry verification and welding-procedure qualification

Available Product Forms

Incoloy 925 supply range

Review available product forms, size ranges, standards and delivery options for this alloy.

Form	Common Size Range	Delivery Condition	Typical Applications	Page Link
Pipe & Tube	OD 6-355 mm, wall thickness or schedule to specification; larger sizes subject to mill review	Seamless, cold drawn, solution annealed and aged, or supplied for subsequent aging	Downhole tubing, completion equipment, high-strength piping and sour-gas components	View Pipe & Tube
Round Bar	Diameter 6-300 mm, custom cut lengths and larger forged sections available	Hot rolled, forged, cold drawn, solution annealed, aged, peeled or ground	Valve stems, hangers, landing nipples, tool joints, pump shafts and packer components	View Round Bar
Sheet & Plate	Thickness 0.5-80 mm, subject to mill availability and minimum production quantity	Annealed, hot or cold rolled, descaled and supplied for subsequent fabrication and aging	High-strength corrosion-resistant fabrications, pressure parts and custom equipment	View Sheet & Plate
Strip & Foil	Thickness 0.05-3 mm, slit widths and coil weights subject to mill capability	Cold rolled, annealed or cold worked, with final aging as specified	Spring components, retainers, diaphragms, seals and custom formed parts	View Strip & Foil
Wire	Diameter 0.5-15 mm, supplied in coils, spools or straight lengths	Cold drawn, solution annealed, aged, bright or pickled	Fasteners, springs, retaining parts and high-strength formed components	View Wire
Fasteners	Standard and custom bolts, nuts, screws, studs, pins and washers	Machined or thread rolled from qualified bar, solution annealed and aged	Wellheads, subsea equipment, valves, pumps and sour-service pressure equipment	View Fasteners
Fittings	Drawing-based dimensions and selected ASME or API configurations	Machined from qualified bar, tube or forging stock, solution annealed and aged	High-pressure completion systems, sour-gas piping and custom oilfield equipment	View Fittings
Flanges	ASME, API and custom drawing dimensions, subject to raw-material and design approval	Forged, solution annealed, aged, machined and inspected	Wellhead systems, high-pressure piping, valves and subsea connections	View Flanges
Forgings	Rings, blocks, shafts, hubs and drawing-based forgings up to mill capability	Forged, solution annealed and aged, rough machined or finish machined	Hangers, tool joints, packer parts, valve bodies and pressure-control equipment	View Forgings
Welding Wire	Diameter 0.8-4.0 mm, supplied in spool, coil or straight length	Alloy 725-type clean bright filler wire, precision drawn and chemistry controlled	Qualified GTAW and GMAW fabrication or repair of Incoloy 925 components	View Welding Wire

Material Selection Guide

When to consider Incoloy 925

This guide helps buyers connect service conditions with the typical advantage of Alloy 625. Final selection should consider medium concentration, temperature, pressure, fabrication, availability and budget.

Service Requirement	Why Incoloy 925 Helps	Common Product Form	Buyer Note
Sour oil and gas production	Combines high strength with resistance to sulfide stress cracking and stress corrosion cracking in qualified H2S-containing environments.	Tube, bar, forgings and completion components	Provide H2S partial pressure, temperature, pH, chloride content, elemental sulfur and required NACE condition.
Downhole completion equipment	Age hardening provides high yield strength for loaded components exposed to corrosive production fluids.	Hangers, landing nipples, tool joints, packers and valve components	Specify pressure rating, load, dimensional tolerances, heat treatment and NDT requirements.
High-strength corrosion-resistant bolting	Provides higher strength than solution-annealed corrosion-resistant alloys while retaining useful environmental resistance.	Bar, wire, bolts, studs and nuts	Confirm API 20F or project bolting class, thread method, hardness and low-temperature impact requirements.
Marine and pump shafting	Nickel, chromium, molybdenum and copper provide resistance to seawater and selected reducing environments.	Round bar, forgings and finish-machined shafts	Review seawater temperature, velocity, deposits, galvanic coupling and required surface finish.
High-strength piping systems	Combines precipitation-hardened strength with resistance to general and localized corrosion.	Seamless pipe, tube, fittings and forged connections	Confirm design code, pressure, temperature, manufacturing route and required heat treatment.
Welded oilfield components	Can be joined using Alloy 725-type filler with qualified GTAW or GMAW procedures.	Tube, forgings, machined parts and welding wire	SAW and SMAW are generally not recommended; specify pre-weld and post-weld heat-treatment sequence.

Why Choose Us

Supply and quality support for Incoloy 925

For ranking traffic, buyers need more than a data sheet. This section gives clear trust signals for procurement, engineering and quality teams.

STASTM / ASME / AMS / EN

Quotation can be matched to project standards and product form specifications.

MTEN10204 3.1 MTC

Heat number, chemistry, mechanical properties and inspection records can be supplied.

QCPMI & Inspection

PMI, UT, dimensional inspection, visual inspection and packing check are available.

CSCustom Size

Cutting, machining allowance, rough machining and drawing-based supply can be arranged.

EPExport Packing

Wooden case, bundle, waterproof protection and international shipping documents.

RFFast Technical Reply

Send grade, size, standard, quantity and destination for a practical quotation route.

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FAQ

Incoloy 925 questions from buyers

Find practical answers about procurement, standards, fabrication and industrial applications.

Incoloy 925 is mainly used for downhole tubular components, valves, hangers, landing nipples, tool joints, packers, wellhead equipment, high-strength fasteners, marine shafting, pump shafts and corrosion-resistant high-pressure piping systems.

Yes. UNS N09925 is the standardized UNS designation for Incoloy 925. Unlike some other Incoloy grades, N09925 does not have a widely adopted Werkstoff number or standardized EN alloy name, so UNS N09925 should be stated on purchasing documents.

Incoloy 925 has a corrosion-resistant base chemistry related to Alloy 825 but contains higher controlled titanium together with aluminum. These additions allow gamma-prime precipitation hardening, giving Alloy 925 much higher yield and tensile strength after aging.

YSN128 can quote round bar, flat bar, wire, seamless tube, forging stock, custom forgings, fasteners, machined fittings and drawing-based oilfield components. Plate, sheet and strip can be discussed subject to mill availability and minimum production quantity.

Common standards include ASTM B805 for bar and wire, ASTM B872 for plate, sheet and strip, ASTM B983 for high-strength seamless pipe and tube, ASTM B637 for bars and forgings, and API 6ACRA or API 20F for selected oil and gas components and fasteners.

Solution annealing is commonly performed at 980-1040 °C for 30 minutes to 4 hours, followed by air cooling or faster cooling for sections up to 25 mm and water quenching for larger sections. A typical aging treatment is 732-749 °C for 6-9 hours, furnace cooling to 621 °C and holding for a total aging time of 18 hours, followed by air cooling.

No. The alloy can be supplied for qualified sour-service applications, but compliance depends on material condition, heat treatment, hardness, product form and environmental limits. H2S partial pressure, temperature, pH, chloride concentration and elemental sulfur must be reviewed against the applicable edition of NACE MR0175 / ISO 15156 and the project specification.

Please send UNS N09925, product form, dimensions, quantity, applicable ASTM or API standard, required strength class, heat treatment, hardness limits, certificate requirements and destination. For sour service, also provide the operating temperature, H2S partial pressure, pH, chloride content, elemental sulfur conditions and required NACE documentation.

Incoloy 925