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Nickel Alloy Grade Data Sheet

Cobalt L605-HAYNES25

Cobalt L-605, commonly identified as HAYNES® 25 alloy, is a cobalt-nickel-chromium-tungsten solid-solution-strengthened superalloy with excellent high-temperature strength, good oxidation resistance and very good sulfidation resistance. It can be conventionally formed, hot worked and welded, and offers excellent resistance to galling and cavitation. Typical applications include aerospace hot-section components, gas-turbine parts, bearing balls and races, springs, combustion hardware, missile components and high-temperature structural assemblies.

 

 

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Material Overview

Cobalt L605-HAYNES25 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

Cobalt L-605, commonly identified as HAYNES® 25 alloy, is a cobalt-nickel-chromium-tungsten solid-solution-strengthened superalloy with excellent high-temperature strength, good oxidation resistance and very good sulfidation resistance. It can be conventionally formed, hot worked and welded, and offers excellent resistance to galling and cavitation. Typical applications include aerospace hot-section components, gas-turbine parts, bearing balls and races, springs, combustion hardware, missile components and high-temperature structural assemblies.

 

 

Cobalt L605-HAYNES25

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

Cobalt L605-HAYNES25 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 Nominal Requirement, wt.% Role in HAYNES 25
Cobalt Co Balance Forms the cobalt-base matrix and supports hot strength.
Chromium Cr 20.0 Provides oxidation and hot-corrosion resistance.
Nickel Ni 10.0 Improves matrix stability, ductility and corrosion resistance.
Tungsten W 15.0 Provides strong solid-solution strengthening and creep resistance.
Iron Fe 3.0 max Controlled residual element.
Molybdenum Mo 1.0 max Controlled strengthening and residual element.
Manganese Mn 1.5 Supports processing and oxide-scale behavior.
Silicon Si 0.4 max Controlled residual element.
Carbon C 0.10 Supports carbide strengthening and grain-boundary stability.

 

 

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 / Additional Value Condition
Density 9.07 g/cm3 0.327 lb/in3 Room temperature
Melting Range 1330-1410 °C 2425-2570 °F Typical range
Electrical Resistivity 88.6 µΩ·cm 34.9 µΩ·in Room temperature
Thermal Conductivity 10.5 W/m·°C 72 Btu·in/ft2·h·°F Approximately 25 °C
Thermal Conductivity 15.9 / 19.5 / 24.5 W/m·°C At 300 / 500 / 800 °C Temperature dependent
Specific Heat 403 J/kg·°C 0.096 Btu/lb·°F Approximately 25 °C
Specific Heat 495 / 582 / 596 J/kg·°C At 500 / 700 / 900 °C Temperature dependent
Dynamic Modulus of Elasticity 225 GPa 32.6 x 106 psi Room temperature
Dynamic Modulus of Elasticity 197 / 181 / 163 GPa At 400 / 600 / 800 °C Temperature dependent
Mean Coefficient of Thermal Expansion 12.8 / 13.3 / 14.0 µm/m·°C 25-100 / 25-300 / 25-500 °C Mean values
Mean Coefficient of Thermal Expansion 14.6 / 15.1 / 15.8 µm/m·°C 25-600 / 25-700 / 25-800 °C Mean values
Mean Coefficient of Thermal Expansion 16.2 / 16.7 µm/m·°C 25-900 / 25-1000 °C Mean values

 

 

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 / Test Temperature Yield Strength, 0.2% Tensile Strength Elongation Condition / Notes
Sheet, room temperature 476 MPa 996 MPa 54.7% Solution heat treated; representative data
Plate, room temperature 474 MPa 1000 MPa 58.8% Solution heat treated; representative data
Bar, room temperature 505 MPa 1015 MPa 60% Hot rolled and solution annealed; representative data
Sheet, 649 °C 256 MPa 823 MPa 54.2% Solution heat treated; typical elevated-temperature data
Sheet, 760 °C 245 MPa 569 MPa 33.9% Solution heat treated; typical elevated-temperature data
Sheet, 871 °C 231 MPa 319 MPa 97.8% Solution heat treated; limited data
Solution-treated hardness Approximately 251 DPH / 22 HRC at room temperature Representative sheet, plate and bar hardness varies by product form
Solution-annealed bar stress rupture, 760 °C Approximately 217 MPa for 100 h; 166 MPa for 1000 h Representative initial stress to rupture
Solution-annealed bar stress rupture, 871 °C Approximately 114 MPa for 100 h; 83 MPa for 1000 h Representative initial stress to rupture
Solution-annealed bar stress rupture, 982 °C Approximately 52 MPa for 100 h; 34 MPa for 1000 h Representative initial stress to rupture
Values are typical and condition-dependent, not guaranteed minimums. Product form, section size, grain size, cold work and heat-treatment history can significantly change the results.

 

 

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 Cobalt L605-HAYNES25 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 / Requirement Common Standard Scope Buyer Note
Sheet, Plate, Strip and Foil AMS 5537 Solution heat-treated cobalt alloy flat products The current AMS revision controls thickness, condition, testing and acceptance.
Billet, Rod and Bar AMS 5759 HAYNES 25 wrought billet, rod and bar Specify size, solution treatment and required mechanical tests.
Billet, Rod, Bar and Forgings MIL-C-24252D Legacy military procurement reference for cobalt alloy products Verify contract applicability and the required revision before ordering.
Coated Electrodes AMS 5797 HAYNES 25 matching-composition covered electrodes Use a qualified welding procedure and control heat input.
Bare Welding Rods and Wire AMS 5796 Matching-composition GTAW and GMAW filler metal Available in spool, coil or straight-length formats according to diameter.
Corrosion and Sour-Gas Service NACE MR0175 / ISO 15156 Material selection reference for specified oil and gas environments Confirm environmental limits, hardness and project qualification.
Aerospace Design Data MMPDS 6.4.1 Published aerospace material design information Use the applicable edition and approved material condition.
Solution Heat Treatment Manufacturer-recommended practice 1175-1230 °C for a time based on section thickness, followed by rapid cooling or water quenching Lower-temperature intermediate anneals may precipitate carbides; a final solution treatment is normally required.
Pipe, Tube and Fittings Not listed as ordinary HAYNES 25 product specifications Custom or project-specific fabrication only Confirm manufacturing route, weld procedure, inspection and qualification before purchase.

 

 

Available Product Forms

Cobalt L605-HAYNES25 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 Custom seamless or welded dimensions to drawing Solution treated or fabricated to project requirements Special hot-gas ducts, bearing housings and aerospace assemblies View Pipe & Tube
Round Bar Small bar through large forged or rolled diameters Solution annealed, peeled, ground or machined Bearing parts, shafts, fasteners and high-temperature hardware View Round Bar
Sheet & Plate Foil and sheet through plate up to approximately 57 mm under AMS 5537 Solution heat treated, descaled, pickled or polished Combustion hardware, turbine parts, springs and aerospace structures View Sheet & Plate
Strip & Foil Precision strip and foil in custom slit widths Cold rolled, solution treated, bright or cleaned Springs, seals, flexible hot-section parts and bearing components View Strip & Foil
Wire Approximately 0.76-4.70 mm for welding and precision wire products Cold drawn, solution treated, spool, coil or straight length Welding, springs, mesh and bearing-related components View Wire
Fasteners Bolts, nuts, screws, studs and custom aerospace hardware Machined from AMS 5759 stock and finished to drawing Gas turbines, hot-section structures and high-temperature joints View Fasteners
Fittings Custom elbows, tees, reducers and connectors to drawing Fabricated, machined and inspected to project requirements Special aerospace and industrial high-temperature systems View Fittings
Flanges Forged rings and drawing-based machined flanges Solution treated, machined and inspected as specified Hot-gas systems, turbine assemblies and specialty connections View Flanges
Forgings Rings, discs, blocks, shafts and custom forgings Forged and solution heat treated to AMS 5759 or project requirements Turbine components, bearing hardware and high-temperature structures View Forgings
Welding Wire Diameter approximately 0.76-4.70 mm AMS 5796, spool, coil or 914 mm straight lengths GTAW, GMAW, dissimilar joining and qualified repair welding View Welding Wire

 

 

Material Selection Guide

When to consider Cobalt L605-HAYNES25

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.

Alloy Selection Strength Typical Position Selection Note
Cobalt L-605 / HAYNES® 25 High-temperature strength, galling resistance and good conventional fabrication Bearings, springs, gas-turbine hot-section and aerospace hardware Select when cobalt-base solid-solution strength and wear resistance are important.
HAYNES® 188 Improved oxidation resistance and better long-term thermal stability Combustion liners, transition ducts and afterburner components Often preferred over HAYNES 25 for modern hot-gas engine designs.
HAYNES® 230® Excellent oxidation resistance, thermal stability and fabricability Combustion, furnace and hot-gas containment parts Consider when environmental resistance and long exposure stability exceed the need for maximum L-605 wear strength.
Rene 41 Higher precipitation-hardened tensile and creep strength Highly stressed aerospace hot-section parts Requires more demanding heat-treatment and welding control than L-605.
Alloy 718 Excellent weldability, fabricability and strong lower-temperature performance Aircraft structures, fasteners and rotating parts below approximately 650 °C Usually easier to process, but it is not a direct replacement for L-605 at the highest temperatures.
CoCrMo-F75 Cast implant-grade corrosion and wear resistance Orthopedic and dental investment castings Choose F75 for cast medical implants; choose L-605/HAYNES 25 for wrought aerospace and bearing applications.

 

 

Why Choose Us

Supply and quality support for Cobalt L605-HAYNES25

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

Cobalt L605-HAYNES25 questions from buyers

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

Cobalt L-605, also called HAYNES 25, is used for aerospace hot-section components, gas-turbine parts, bearing balls and races, springs, combustion hardware, missile components, fasteners and assemblies requiring high strength, wear resistance and resistance to galling.

Yes. HAYNES 25 is the HAYNES International designation for the cobalt-nickel-chromium-tungsten alloy commonly known as L-605. Both are associated with UNS R30605, but the applicable AMS specification and product condition should still be stated on the purchase order.

HAYNES 25 is particularly effective for long-term high-temperature service from approximately 650 to 980 °C. The 980 °C value refers to suitable oxidation-resistant service and is not automatically an allowable design temperature. Stress, atmosphere, exposure time and geometry must be evaluated.

The alloy is normally furnished solution heat treated. A typical final treatment is 1175-1230 °C for a time based on section thickness, followed by rapid cooling or water quenching. Intermediate annealing below the final solution temperature can precipitate carbides, so a subsequent final solution treatment is normally required for optimum properties.

Yes. HAYNES 25 can be welded by GTAW, GMAW, SMAW, electron-beam and resistance welding. Matching AMS 5796 filler is commonly used, while AMS 5797 electrodes are available for shielded metal arc welding. Preheat is generally not required, interpass temperature should remain below 93 °C, and submerged arc welding is not recommended.

AMS 5537 covers sheet, plate, strip and foil; AMS 5759 and MIL-C-24252D cover billet, rod, bar and forgings; AMS 5796 covers bare welding rods and wire; AMS 5797 covers coated electrodes; and MMPDS 6.4.1 provides aerospace design data. NACE MR0175 or ISO 15156 may apply to specified sour-service projects.

We can quote sheet, plate, strip, foil, round bar, rod, wire, welding wire, forgings, fasteners and custom machined components. Pipe, tube, fittings and flanges are not listed as ordinary HAYNES 25 product specifications and should be treated as drawing-based or project-specific supply.

Please send the grade or UNS number, product form, dimensions, quantity, applicable AMS specification, solution-treatment condition, mechanical requirements, surface finish, inspection requirements, welding details and destination. Drawings are required for forgings, fasteners, fittings and custom components.

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