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Nickel Alloy Grade Data Sheet

Incoloy 825

Incoloy 825, designated UNS N08825, is a titanium-stabilized nickel-iron-chromium alloy containing molybdenum and copper for resistance to a wide range of corrosive environments. Its nickel, molybdenum and copper contents provide useful resistance to reducing media such as sulfuric and phosphoric acids, while chromium supports resistance to oxidizing substances. Molybdenum improves resistance to pitting and crevice corrosion, and titanium stabilization helps protect against intergranular corrosion. Common applications include chemical processing, acid production, pickling equipment, pollution control, offshore oil and gas systems, seawater equipment and radioactive-waste handling.

 

 

 

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Material Overview

Incoloy 825 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 825, designated UNS N08825, is a titanium-stabilized nickel-iron-chromium alloy containing molybdenum and copper for resistance to a wide range of corrosive environments. Its nickel, molybdenum and copper contents provide useful resistance to reducing media such as sulfuric and phosphoric acids, while chromium supports resistance to oxidizing substances. Molybdenum improves resistance to pitting and crevice corrosion, and titanium stabilization helps protect against intergranular corrosion. Common applications include chemical processing, acid production, pickling equipment, pollution control, offshore oil and gas systems, seawater equipment and radioactive-waste handling.

 

 

 

Incoloy 825

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 825 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 Composition, wt.% Role in Incoloy 825
Nickel Ni 38.0-46.0 Provides resistance to chloride-ion stress-corrosion cracking and supports performance in reducing media.
Chromium Cr 19.5-23.5 Improves resistance to oxidizing substances, nitric acid, nitrates and oxidizing salts.
Iron Fe 22.0 min Forms the principal balance of the stable austenitic alloy matrix.
Molybdenum Mo 2.5-3.5 Improves resistance to reducing acids, pitting and crevice corrosion.
Copper Cu 1.5-3.0 Enhances resistance to sulfuric acid and other reducing environments.
Titanium Ti 0.6-1.2 Stabilizes the alloy against sensitization and intergranular corrosion after suitable heat treatment.
Carbon C 0.05 max Restricted to help control carbide precipitation and sensitization.
Manganese Mn 1.0 max Controlled minor alloying and deoxidizing element.
Silicon Si 0.50 max Controlled for processing and weld quality.
Aluminum Al 0.20 max Controlled residual and deoxidizing element.
Sulfur S 0.030 max Controlled residual element for processing 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 Value Condition / Notes
Density 8.14 g/cm3 0.294 lb/in3 Room temperature
Melting Range 1370-1400 °C 2500-2550 °F Typical range
Specific Heat 440 J/kg·°C 0.105 Btu/lb·°F Room-temperature typical value
Thermal Conductivity 11.1 W/m·°C 76.8 Btu·in/ft2·h·°F Approx. 25 °C
Electrical Resistivity 1.13 µΩ·m Approx. 678 ohm-cmil/ft Approx. 25 °C
Modulus of Elasticity 196 GPa Approx. 28.4 x 103 ksi Approx. 20 °C
Shear Modulus 76 GPa Approx. 11.0 x 103 ksi Approx. 20 °C
Mean Coefficient of Thermal Expansion 14.1 µm/m·°C Approx. 7.8 x 10-6 in/in·°F Mean value from approximately 25 to 100 °C
Magnetic Permeability Approx. 1.005 Essentially non-magnetic At 200 oersted

 

 

 

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 Technical Note
Plate, sheet and strip – annealed 586 MPa (85 ksi) min 241 MPa (35 ksi) min 30% min Common ASTM B424 minimum requirements for UNS N08825.
Seamless pipe and tube – annealed 586 MPa (85 ksi) min 241 MPa (35 ksi) min 30% min Common ASTM B423 minimum requirements; dimensional provisions may affect elongation testing.
Representative annealed bar Approx. 690 MPa (100 ksi) Approx. 324 MPa (47 ksi) Approx. 45% Typical room-temperature data; ASTM B425 acceptance requirements must be checked separately.
Representative annealed plate Approx. 662 MPa (96 ksi) Approx. 338 MPa (49 ksi) Approx. 45% Typical room-temperature properties, not guaranteed specification minima.
Representative annealed sheet Approx. 758 MPa (110 ksi) Approx. 421 MPa (61 ksi) Approx. 39% Typical properties depend on thickness and processing history.
Representative cold-drawn tubing Approx. 1000 MPa (145 ksi) Approx. 889 MPa (129 ksi) Approx. 15% Cold work substantially increases strength while reducing ductility.
Forgings, flanges and fittings Specification dependent Specification dependent Specification dependent Final requirements depend on product standard, dimensions and heat-treatment condition.

Values shown are representative or common specification minimums. Final acceptance depends on the applicable product specification, dimensions, delivery condition, heat treatment, test orientation and material test certificate. Alloy 825 is not normally selected for service where creep-rupture properties govern the design, particularly after prolonged exposure above approximately 540 °C.

 

 

 

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 825 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 and Strip ASTM B424 / ASME SB424, ASTM B906 / ASME SB906, ISO 6208 Hot-rolled plate, cold-rolled sheet, strip and cut blanks EN 10204 3.1 MTC, chemistry, tensile testing and dimensional inspection
Rod and Bar ASTM B425 / ASME SB425, ISO 9723 Round bar, rod, square bar, flat bar and hexagon MTC, PMI, dimensional inspection and mechanical testing when specified
Seamless Heat-Exchanger Tube ASTM B163 / ASME SB163 Condenser and heat-exchanger tubing Hydrostatic or specified NDT, dimensional inspection and MTC
Seamless Pipe & Tube ASTM B423 / ASME SB423 with ASTM B829 / ASME SB829 Seamless process pipe, instrumentation tube and general corrosion-service tubing Hydrostatic or electric NDT, dimensional inspection and MTC
Welded Pipe ASTM B705 / ASME SB705 with ASTM B775 / ASME SB775 Longitudinally welded process and corrosion-resistant pipe Weld examination, pressure or specified NDT, heat-treatment record and MTC
Welded Heat-Exchanger Tube ASTM B704 / ASME SB704 with ASTM B751 / ASME SB751 Boiler, condenser and heat-exchanger tubing Flattening, flange and specified nondestructive tests, plus MTC
Forgings, Flanges and Valve Parts ASTM B564 / ASME SB564, ISO 9725 Rings, discs, flanges, blocks and pressure-containing forgings Mechanical testing, heat-treatment record, PMI, UT when specified and MTC
Wrought Fittings ASTM B366 / ASME SB366 Elbows, tees, reducers, caps and custom wrought fittings PMI, dimensional inspection, heat-treatment record and MTC
Welding Products AWS A5.14 ERNiCrMo-3 / AWS A5.11 ENiCrMo-3; ERNiCrMo-14 or ENiCrMo-14 for selected severe corrosion service Welding wire, rod and covered electrodes Consumable certificate, lot traceability and procedure qualification

 

 

 

Available Product Forms

Incoloy 825 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 Seamless or welded, stabilized annealed, pickled or bright finished Acid transfer lines, offshore systems, heat exchangers and pollution-control equipment View Pipe & Tube
Round Bar Diameter 3-300 mm, larger forged sizes and custom lengths available Hot finished, forged, annealed, peeled or polished Pump shafts, valve stems, fasteners and machined corrosion-resistant components View Round Bar
Sheet & Plate Thickness 0.5-100 mm, custom widths, lengths and cut parts Stabilized annealed, pickled, cold rolled or polished Acid tanks, scrubbers, vessels, pickling equipment and marine fabrications View Sheet & Plate
Strip & Foil Thickness 0.02-3 mm, slit widths and coil weights to specification Cold rolled, annealed, bright or pickled Gaskets, seals, diaphragms and formed corrosion-resistant components View Strip & Foil
Wire Diameter 0.1-12 mm, coil, spool or straight-length supply Cold drawn, annealed, bright or cleaned Marine mesh, screens, springs, tie wire and fastener production View Wire
Fasteners Standard and custom bolts, nuts, screws, studs and washers Annealed, machined, rolled thread or custom finished Offshore structures, chemical plants, scrubbers, pumps and valves View Fasteners
Fittings ASME, EN and drawing-based elbows, tees, reducers and caps Wrought or fabricated, annealed and inspected Acid process lines, seawater systems, offshore piping and pollution-control equipment View Fittings
Flanges ASME B16.5, ASME B16.47, EN or custom dimensions Forged, annealed, machined and inspected Chemical piping, offshore systems, pressure vessels and valve connections View Flanges
Forgings Rings, discs, blocks, shafts and drawing-based components Forged, annealed, rough or finish machined Pump bodies, valve components, tube sheets, rings and pressure parts View Forgings
Welding Wire Diameter 0.8-4.0 mm, spool, coil or straight-length supply Clean bright finish, precision drawn and controlled chemistry Joining Alloy 825, repair welding and corrosion-resistant overlay View Welding Wire

 

 

 

Material Selection Guide

When to consider Incoloy 825

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 825 Helps Common Product Form Buyer Note
Sulfuric and phosphoric acid service Nickel, molybdenum and copper provide useful resistance in many reducing acid conditions. Plate, pipe, tube, fittings, flanges and forgings Provide acid concentration, temperature, impurities, aeration and flow conditions.
Mixed oxidizing and reducing environments Chromium supports resistance to oxidizing media while nickel, molybdenum and copper address reducing conditions. Vessel, heat exchanger, pipe, tube and fitting Review every process constituent and possible operating or cleaning condition.
Resistance to localized corrosion Molybdenum improves resistance to pitting and crevice corrosion in selected chloride-bearing environments. Pipe, tube, plate, fastener and fitting Confirm chloride level, temperature, deposits, crevices and seawater condition.
Welded chemical-processing equipment Titanium stabilization helps reduce susceptibility to intergranular corrosion after suitable processing. Plate, sheet, pipe, tube and fabricated assembly Use a qualified WPS and evaluate whether subsequent stabilization annealing is required.
Sour oil and gas service The alloy provides resistance to selected sour environments containing chlorides and hydrogen sulfide. Pipe, tube, bar, fastener, fitting and flange Verify product condition and all ISO 15156 / NACE MR0175 environmental and hardness limits.
Pollution-control and flue-gas equipment Resists selected sulfur-containing condensates and mixed corrosive environments. Sheet, plate, pipe, tube and fittings Provide condensate chemistry, pH, chloride level, temperature and wet-dry cycling.

 

 

 

Why Choose Us

Supply and quality support for Incoloy 825

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 825 questions from buyers

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

Incoloy 825 is used for chemical processing, sulfuric and phosphoric acid equipment, pickling systems, pollution-control equipment, offshore oil and gas installations, seawater systems, acid production and radioactive-waste handling.

Yes. UNS N08825 is the standardized designation for Incoloy 825. The material may also be identified as Alloy 825, Werkstoff 2.4858 or NiCr21Mo.

Alloy 825 is a nickel-iron-chromium alloy containing copper, molybdenum and titanium, while Alloy 625 has higher nickel and molybdenum together with niobium. Alloy 625 generally provides greater strength and localized-corrosion resistance, while Alloy 825 is often selected as a cost-effective material for sulfuric acid, phosphoric acid and selected sour-service environments.

We can quote plate, sheet, strip, foil, round bar, rod, wire, seamless or welded pipe and tube, fasteners, fittings, flanges, forgings and welding wire. Custom dimensions, cut pieces, machining allowance and drawing-based products can also be discussed.

Common standards include ASTM B424 for plate, sheet and strip, ASTM B425 for rod and bar, ASTM B423 or B163 for seamless pipe and tube, ASTM B705 for welded pipe, ASTM B704 for welded heat-exchanger tube, ASTM B564 for forgings and ASTM B366 for wrought fittings.

Yes. Alloy 825 has good weldability using conventional processes. AWS ERNiCrMo-3 filler metal and ENiCrMo-3 covered electrodes are commonly used. ERNiCrMo-14 or ENiCrMo-14 consumables may be considered where especially high weld-metal corrosion resistance is required, subject to the qualified welding procedure.

Alloy 825 is used in selected seawater, offshore and sour oil and gas environments, but suitability is not automatic. Chloride concentration, temperature, flow, crevices, hydrogen sulfide partial pressure, pH, elemental sulfur and the applicable ISO 15156 or NACE MR0175 limits must be reviewed.

Please provide UNS N08825, product form, dimensions, quantity, applicable ASTM or ASME standard, delivery condition, certificate requirements and destination. For corrosion review, also send the complete process chemistry, concentrations, temperature, pressure, flow conditions, drawings and inspection requirements.

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