Name: Incoloy 25-6Mo
Brand: Incoloy

Material Overview

Incoloy 25-6Mo 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 25-6MO is commonly specified for equipment exposed to seawater, chloride-bearing acids, contaminated cooling water and other aggressive process media. Also identified as Alloy 926 or UNS N08926, this super-austenitic nickel-iron-chromium alloy contains approximately 6.5% molybdenum together with copper and nitrogen. The composition provides excellent resistance to pitting, crevice corrosion, chloride-induced stress corrosion cracking and both oxidizing and reducing chemicals. Typical applications include offshore systems, flue-gas desulfurization equipment, chemical tanks, heat exchangers, seawater piping, pulp bleaching equipment and sulfuric or phosphoric acid processing.

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 25-6Mo 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 Alloy 25-6MO
Iron	Fe	Balance	Base element of the super-austenitic alloy matrix.
Nickel	Ni	24.0-26.0	Stabilizes the austenitic structure and improves resistance to chloride stress corrosion cracking.
Chromium	Cr	20.0-21.0	Provides passivation and resistance to oxidizing media and general corrosion.
Molybdenum	Mo	6.0-7.0	Strongly improves resistance to pitting, crevice corrosion and reducing acids.
Copper	Cu	0.50-1.50	Improves resistance to sulfuric acid and other reducing environments.
Nitrogen	N	0.15-0.25	Increases strength, stabilizes austenite and improves localized corrosion resistance.
Carbon	C	0.020 max	Restricted to reduce sensitization and intergranular corrosion risk.
Manganese	Mn	1.0 max	Controlled minor alloying and deoxidizing element.
Silicon	Si	0.50 max	Controlled deoxidizing element and residual constituent.
Phosphorus	P	0.030 max	Controlled impurity for corrosion and fabrication performance.
Sulfur	S	0.010 max	Closely controlled impurity for hot-workability and weldability.

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	8.10 g/cm3	506 lb/ft3	At 20 °C
Melting Range	1320-1390 °C	2408-2534 °F	Typical range
Specific Heat	415 J/kg·K	0.0991 Btu/lb·°F	At 20 °C
Thermal Conductivity	12.0 W/m·K	6.93 Btu·in/ft2·h·°F	At 20 °C
Electrical Resistivity	96 µΩ·cm	Approx. 577 ohm-cmil/ft	At 20 °C
Modulus of Elasticity	193 GPa	28.0 x 10³ ksi	At 20 °C
Mean Thermal Expansion	15.0 x 10^-6/K	8.33 x 10^-6/°F	Between 20 and 100 °C
Relative Magnetic Permeability	Approx. 1.001	Essentially non-magnetic	At 20 °C

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	Notes
Sheet up to 50 mm – solution annealed	600-800 MPa	300 MPa min	40% min	Room-temperature specification range
Strip up to 3 mm – solution annealed	600-800 MPa	300 MPa min	40% min	Thin longitudinal specimens may have adjusted elongation requirements
Bar up to 300 mm – solution annealed	600-800 MPa	300 MPa min	40% min	Larger dimensions require separate agreement
Pipe and tube – solution annealed	By ASTM B677 / B673 / B674	By specification	By specification	Depends on seamless or welded manufacturing route
Wire – annealed	By diameter and specification	By specification	By specification	Bright annealed or drawn condition available
Cold-worked product	Higher than annealed condition	By cold-work level	Reduced with cold work	Final solution annealing is recommended after major cold forming

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 25-6Mo 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 A240 / ASME SA240, ASTM B625 / ASME SB625, EN 10088-2, EN 10028-7, VdTÜV 502	Hot rolled plate, cold rolled sheet, strip and cut blanks	EN 10204 3.1, chemical, mechanical, corrosion and dimensional inspection
Rod, Bar, Wire	ASTM B649 / ASME SB649, EN 10088-3, VdTÜV 502	Round bar, rod, wire, billet and machined blanks	MTC, PMI, mechanical test and dimensional inspection
Seamless Pipe & Tube	ASTM B677 / ASME SB677	Seamless pipe, process tube and heat-exchanger tube	Hydrotest, eddy current test, PMI and MTC
Welded Pipe & Tube	ASTM B673 / ASME SB673, ASTM B674 / ASME SB674, API 5LD	Longitudinally welded pipe and welded heat-exchanger tube	Radiography, hydrotest, eddy current test and MTC as specified
Forgings, Fittings & Flanges	EN 10222, ASTM B366 / ASME SB366 or approved customer specification	Forged rings, flanges, elbows, tees, reducers and valve components	Heat-treatment record, UT, PMI, dimensional inspection and MTC
Oil & Gas Service	NACE MR0175 / ISO 15156 and project specification	Downhole components, pump parts, couplings and offshore equipment	Hardness, corrosion, PMI and purchaser-specified inspection
Welding Products	AWS A5.14 ERNiCrMo-13 or ERNiCrMo-3, ISO 18274 S Ni 6059 or S Ni 6625	VDM FM 59, Alloy 59 filler or Alloy 625 filler	Mill certificate, chemistry verification and welding inspection

Available Product Forms

Incoloy 25-6Mo 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 6-610 mm, wall thickness or schedule to specification; larger fabricated pipe subject to review	Seamless or welded, solution annealed, pickled and passivated	Seawater systems, condensers, chemical piping, offshore injection systems and FGD equipment	View Pipe & Tube
Round Bar	Diameter 6-400 mm, larger forged sections and custom cut lengths available	Forged, rolled, drawn, solution annealed, peeled, ground or polished	Pump shafts, valve parts, couplings, fasteners and offshore components	View Round Bar
Sheet & Plate	Thickness 0.5-100 mm, custom widths, lengths and cut profiles	Hot or cold rolled, solution annealed, descaled, pickled or polished	Chemical tanks, heat exchangers, FGD equipment, pulp bleaching systems and offshore structures	View Sheet & Plate
Strip & Foil	Thickness 0.025-3 mm, slit widths and coil sizes to specification	Cold rolled, solution annealed, pickled or bright annealed	Flexible piping, seals, diaphragms, chemical-process components and corrosion-resistant liners	View Strip & Foil
Wire	Diameter 0.16-19 mm, supplied in coils, spools, containers or straight lengths	Cold drawn, bright annealed, quarter hard to hard, or hot rolled	Mesh, springs, fasteners, filter components and welding-consumable production	View Wire
Fasteners	Standard and custom bolts, nuts, screws, studs, pins and washers	Cold formed, hot forged or machined, solution annealed and passivated	Offshore platforms, seawater systems, chemical plants and flue-gas cleaning equipment	View Fasteners
Fittings	ASME, EN and drawing-based dimensions, including custom heavy-wall sizes	Seamless, welded, formed or machined, solution annealed and pickled	Seawater piping, acid processing, chemical transfer and offshore injection systems	View Fittings
Flanges	ASME B16.5, ASME B16.47, EN and custom drawing dimensions	Forged, solution annealed, machined, pickled and inspected	Chemical piping, seawater systems, pumps, valves and pressure equipment	View Flanges
Forgings	Rings, discs, blocks, shafts and custom forgings up to mill capability	Forged, solution annealed, rough machined or finish machined	Pump components, valve bodies, pressure parts and offshore equipment	View Forgings
Welding Wire	Diameter 0.8-4.0 mm, supplied in spool, coil or straight length	Clean bright finish, precision drawn and chemistry controlled	Welding Alloy 25-6MO tanks, piping, heat exchangers and dissimilar-metal joints	View Welding Wire

Material Selection Guide

When to consider Incoloy 25-6Mo

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 Alloy 25-6MO Helps	Common Product Form	Buyer Note
Seawater and chloride service	High molybdenum and nitrogen contents provide strong resistance to pitting, crevice corrosion and chloride stress corrosion cracking.	Pipe, tube, plate, fittings and flanges	Confirm chloride level, temperature, flow velocity, deposits and crevice geometry.
Sulfuric and phosphoric acid	Molybdenum, copper, chromium and nickel provide resistance in selected contaminated acid environments.	Plate, pipe, tube, tanks and heat exchangers	Provide acid concentration, temperature, impurities, aeration and process conditions.
Flue-gas desulfurization	Resists chloride-bearing condensates and acidic process conditions found in selected FGD areas.	Sheet, plate, pipe, fittings and fabricated assemblies	Review chloride concentration, pH, deposits and expected operating temperature.
Offshore oil and gas systems	Offers seawater corrosion resistance and higher strength than conventional austenitic stainless steels.	Pipe, tube, bar, fasteners and forgings	Confirm NACE MR0175 / ISO 15156 requirements and cathodic-protection conditions.
Contaminated cooling water	Provides improved localized corrosion resistance in brackish water and polluted condenser-water systems.	Condenser tube, pipe, tube sheet and fittings	Check water chemistry, temperature, velocity, biofouling and cleaning procedure.
Welded chemical equipment	Can be welded using over-alloyed nickel-base filler metals without routine post-weld heat treatment.	Plate, sheet, pipe, tube and welding wire	Control heat input, keep interpass temperature below 120 °C and restore a clean passive surface.

Why Choose Us

Supply and quality support for Incoloy 25-6Mo

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 25-6Mo questions from buyers

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

Incoloy 25-6MO is used for seawater piping, offshore systems, chemical tanks, heat exchangers, sulfuric and phosphoric acid equipment, flue-gas desulfurization systems, pulp bleaching equipment and components exposed to contaminated cooling water.

Yes. UNS N08926 is the standardized UNS designation associated with Incoloy 25-6MO and Alloy 926. The material may also be identified as W.Nr. 1.4529 or X1NiCrMoCuN25-20-7.

Alloy 25-6MO contains approximately 6.5% molybdenum and about 0.2% nitrogen, compared with the lower molybdenum level of 904L. These additions provide higher strength and substantially improved resistance to pitting, crevice corrosion and chloride-induced stress corrosion cracking.

YSN128 can quote plate, sheet, strip, round bar, wire, seamless pipe, welded pipe, heat-exchanger tube, forgings, fasteners, flanges, fittings and drawing-based machined components.

Common standards include ASTM A240 and ASTM B625 for plate and sheet, ASTM B649 for bar and wire, ASTM B677 for seamless pipe and tube, ASTM B673 and B674 for welded pipe and tube, and EN 10088 specifications for flat and long products.

Solution annealing is normally performed between 1150 and 1200 °C, with approximately 1180 °C commonly preferred, followed by rapid water cooling. The holding time depends on product thickness. Thin sections below approximately 1.5 mm may be rapidly air cooled.

Yes. The alloy can be welded using qualified TIG, MIG, plasma and submerged-arc procedures. Over-alloyed fillers such as ERNiCrMo-13 or ERNiCrMo-3 are commonly recommended. Low heat input, stringer beads, clean tooling and an interpass temperature below 120 °C help preserve corrosion resistance.

Please send the grade or UNS number, product form, dimensions, quantity, applicable ASTM, ASME or EN standard, delivery condition, certificate requirements, destination and service medium. Chemical concentration, chloride level, temperature, drawings and inspection requirements are also welcome.

Incoloy 25-6Mo