KC20WN / L605 / Haynes 25 Cobalt-Based Superalloy
Russian Metals supplies KC20WN Cobalt-Based Superalloy for aerospace, gas turbine, rocket engine, combustion chamber, afterburner, turbine nozzle, guide vane and hot-section applications.
KC20WN is a high-temperature cobalt alloy used where strength, oxidation resistance, corrosion resistance, wear resistance and hot-section stability are required in demanding engineering environments.
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Important Material Category Note
KC20WN is not a titanium alloy. It belongs to the cobalt-based superalloy category.
This grade is commonly connected with L605 Alloy, Haynes 25 Alloy, Alloy 25, UNS R30605 and W.Nr. 2.4964. It is a cobalt-chromium-tungsten-nickel alloy designed for high-temperature strength, oxidation resistance and aerospace hot-section performance.
Product Name Table
| Product Keyword | Equivalent Grade | Product Name | Common Product Form |
|---|---|---|---|
| KC20WN Alloy | L605 / Haynes 25 | KC20WN Cobalt-Based Superalloy | Sheet, plate, strip, bar |
| KC 20 WN Cobalt Alloy | UNS R30605 | KC 20 WN High Temperature Alloy | Sheet, plate, forging |
| KC20WN Superalloy | Alloy 25 | KC20WN Aerospace Alloy | Hot-section components |
| KC20WN Wire | L605 Wire | KC20WN Cobalt Alloy Wire | Wire and welding wire |
| KC20WN Ring | W.Nr. 2.4964 | KC20WN Forged Ring | Ring and forging |
| KC20WN Forging | Haynes 25 | KC20WN Cobalt Alloy Forging | Forging and machined blank |
Material Overview
KC20WN / L605 / Haynes 25 / Alloy 25 / UNS R30605 is a cobalt-chromium-tungsten-nickel superalloy designed for high-temperature strength, oxidation resistance, corrosion resistance and hot-section component reliability.
Russian Metals supplies KC20WN cobalt alloy in sheet, plate, strip, foil, bar, rod, wire, welding wire, forging, ring, billet and machined blank forms for aerospace engines, gas turbines, rocket engines, combustion chambers, afterburners, guide vanes and turbine nozzle applications.
Cobalt-Based Superalloy Overview
Cobalt-based superalloys are used where hot strength, oxidation resistance, wear resistance, galling resistance and metallurgical stability are important at elevated temperatures.
KC20WN / L605 is selected for applications where nickel alloys or titanium alloys may not provide the same combination of hot-section performance, sulfidation resistance and strength retention in combustion or turbine environments.
L605 / Haynes 25 / Alloy 25 Overview
KC20WN is commonly connected with L605, Haynes 25 and Alloy 25. These names are widely used for cobalt-based high-temperature alloy products made in sheet, strip, plate, bar, wire, forging and welding consumable forms.
L605 / Haynes 25 is used for aerospace engine material, turbine engine material, combustion chamber parts, afterburner parts, rocket engine components, marine components and petrochemical service where high-temperature performance is required.
UNS R30605 Overview
UNS R30605 is the international material designation commonly associated with L605 / Haynes 25 / Alloy 25 and KC20WN-related cobalt alloy material.
For purchasing, inspection and certification, Russian Metals can support product identification by KC20WN, L605, Haynes 25, Alloy 25, UNS R30605, W.Nr. 2.4964 or Co-20Cr-15W-10Ni material reference, depending on project specification.
Difference Between KC20WN and Titanium Alloys
| Point | KC20WN / L605 / Haynes 25 | Titanium Alloys |
|---|---|---|
| Material Family | Cobalt-based superalloy | Titanium-based alloy |
| Base Element | Cobalt | Titanium |
| Density | Much heavier than titanium alloys | Lightweight compared with cobalt alloys |
| Main Benefit | High-temperature strength, oxidation resistance, galling resistance | Low density, corrosion resistance and strength-to-weight ratio |
| Typical Use | Hot-section parts, turbine components, combustion chambers | Aerospace structures, marine parts, medical and industrial applications |
| Product Focus | High-temperature cobalt alloy components | Lightweight structural and corrosion-resistant components |
KC20WN is heavier than titanium alloy grades, but it can perform better in many high-temperature hot-section applications such as turbine nozzles, combustion chambers, rocket nozzles and afterburner components.
Available Product Forms
| Product Form | KC20WN / L605 Availability | Common Use |
|---|---|---|
| Sheet | Available | Combustion chambers, hot sections and aerospace fabrication |
| Plate | Available | Machined parts, high-temperature components and fabricated assemblies |
| Strip | Available | Thin-gauge fabrication and precision hot-section parts |
| Foil | Available where applicable | Thin-gauge high-temperature applications |
| Bar | Available | Machining, pins, shafts, fasteners and hot-section hardware |
| Rod | Available | Precision machining and aerospace components |
| Wire | Available | Welding, forming, aerospace hardware and special applications |
| Welding Wire | Available | L605 / Alloy 25 welding and repair applications |
| Forging | Available | High-strength and high-temperature components |
| Ring | Available | Aerospace, turbine and engineered assemblies |
| Billet | Available | Forging, rolling, machining and custom manufacturing |
| Machined Blank | Available | CNC-ready cobalt alloy parts |
KC20WN Product Specification Table
| Specification Point | KC20WN / L605 / Haynes 25 Details |
|---|---|
| Material Name | KC20WN Cobalt-Based Superalloy |
| Related Names | L605, Haynes 25, Alloy 25, UNS R30605, W.Nr. 2.4964 |
| Alloy Type | Cobalt-based superalloy |
| Alloy System | Co-Cr-W-Ni |
| Common Composition Style | Co-20Cr-15W-10Ni |
| Product Forms | Sheet, plate, strip, foil, bar, rod, wire, forging, ring, billet |
| Key Benefit | High-temperature strength and oxidation resistance |
| Typical Use | Aerospace engines, gas turbines, rocket engines and combustion parts |
| Supply Condition | Solution-annealed or project-specific condition |
| Certification | MTC, chemical analysis, mechanical testing and heat traceability |
Standards and Material Specification Reference
| Standard / Specification | Common Product Form |
|---|---|
| AMS 5537 | Sheet, strip, plate and foil |
| AMS 5759 | Bar, forging stock and ring material |
| AMS 5796 | Welding wire |
| AMS 5797 | Welding electrode / welding rod |
| UNS R30605 | International UNS designation |
| W.Nr. 2.4964 | European material designation |
| AIR KC20WN / AIR 9165 | Aeronautical heat-resistant alloy reference |
Final standard selection should be confirmed through project specification, drawing requirement, material certificate and inspection plan.
Product Form Details
KC20WN / L605 Sheet
KC20WN sheet is used for combustion chambers, hot-section assemblies, aerospace components, afterburner parts, thermal shields, high-temperature sheet fabrication and formed engine parts.
Sheet can be supplied in solution-annealed, cold-rolled or project-specific surface condition with dimensional inspection and material certificate support.
KC20WN / L605 Plate
KC20WN plate is used for machined parts, high-temperature components, fabricated assemblies, turbine engine hardware and rocket engine applications.
Plate products can be supplied cut-to-size or prepared as machined blanks according to drawing requirement and tolerance needs.
KC20WN / L605 Strip
KC20WN strip is suitable for thin-gauge fabrication, formed hot-section parts, precision components, aerospace sheet metal work and high-temperature spring-type applications.
KC20WN / L605 Foil
KC20WN foil may be supplied for thin-gauge high-temperature applications where oxidation resistance, heat stability and controlled gauge are important.
KC20WN / L605 Bar
KC20WN bar is used for machining, pins, shafts, fasteners, aerospace hardware, hot-section components and high-temperature engineered parts.
KC20WN / L605 Rod
KC20WN rod is suitable for precision machining, CNC components, aerospace parts, turbine engine hardware and high-temperature mechanical components.
KC20WN / L605 Wire
KC20WN wire is used for welding, forming, aerospace hardware, springs, special components and high-temperature service where cobalt alloy wire performance is required.
KC20WN Welding Wire
KC20WN welding wire is connected with L605 / Alloy 25 welding applications and relevant AMS wire specifications. It is used for welding, repair, joining and fabrication of compatible cobalt alloy components.
KC20WN Forging
KC20WN forgings are used for high-strength and high-temperature components such as turbine hardware, rings, nozzles, shafts, hot-section assemblies and aerospace engine parts.
KC20WN Ring
KC20WN rings are used for aerospace, turbine, combustion, sealing and engineered assemblies where high-temperature strength and oxidation resistance are required.
KC20WN Billet
KC20WN billet is supplied for forging, rolling, machining and custom manufacturing. Billet stock can be used to produce rings, bars, forgings and machined components.
KC20WN Machined Blank
KC20WN machined blanks are CNC-ready cobalt alloy pieces prepared for turning, milling, drilling, grinding and final precision engineering applications.
Surface Condition and Finish Options
| Product Type | Surface / Finish Options |
|---|---|
| Sheet and Strip | Bright, pickled, polished, cold-rolled, solution-annealed |
| Plate | Hot-rolled, pickled, ground, machined, sand-blasted |
| Bar and Rod | Bright, black, peeled, polished, ground, machined |
| Wire | Bright, clean, pickled, polished or project-specific finish |
| Welding Wire | Clean, bright, spool-packed or straightened condition |
| Forging and Ring | Black, machined, ground, shot-blasted |
| Billet | Hot-rolled, forged, peeled, machined or project-specific finish |
| Machined Blank | Machined, ground, polished or custom finish |
Dimensional Range Overview
| Product Form | Common Dimensional Details |
|---|---|
| Sheet | Thickness, width and length as per project requirement |
| Plate | Medium or heavy thickness, cut-to-size or machined blank |
| Strip | Controlled thickness and width, coil or cut-length options |
| Foil | Thin-gauge availability where applicable |
| Bar | Diameter and length according to machining requirement |
| Rod | Precision diameter and cut-length options |
| Wire | Diameter, coil, spool or straight length requirement |
| Welding Wire | Wire diameter, spool size and packing based on welding requirement |
| Forging | Drawing-based forged shape, section and weight |
| Ring | Outside diameter, inside diameter, height and machining allowance |
| Billet | Diameter, length and cut size as per forging or machining need |
| Machined Blank | Custom size, tolerance and finish based on drawing |
Chemical Composition Overview
KC20WN mainly contains cobalt, chromium, tungsten and nickel. Cobalt is the base element, chromium supports oxidation and corrosion resistance, tungsten improves high-temperature strength, and nickel supports alloy stability and toughness.
KC20WN / L605 / Haynes 25 Chemical Composition
| Element | Typical Range / Limit |
|---|---|
| Cobalt | Balance |
| Chromium | 19.0–21.0% |
| Tungsten | 14.0–16.0% |
| Nickel | 9.0–11.0% |
| Iron | Max 3.0% |
| Manganese | 1.0–2.0% |
| Carbon | 0.05–0.15% |
| Silicon | Max 0.40% |
| Phosphorus | Max 0.040% |
| Sulfur | Max 0.030% |
Cobalt Balance Note
Cobalt is the base element in KC20WN / L605 / Haynes 25. It provides the foundation for high-temperature strength, metallurgical stability, hot-section performance and cobalt-based superalloy behavior.
Role of Alloying Elements
Chromium
Chromium improves oxidation resistance, corrosion resistance and high-temperature environmental performance. It helps KC20WN perform in oxidizing combustion and turbine atmospheres.
Tungsten
Tungsten supports solid-solution strengthening and high-temperature strength. It helps the alloy maintain mechanical performance in hot-section and load-bearing service.
Nickel
Nickel improves alloy stability, toughness and high-temperature performance. It supports the overall balance of strength, ductility and processing behavior.
Carbon
Carbon is controlled because it affects carbide formation, strength, processing behavior and final mechanical properties. Correct carbon control supports consistent alloy performance.
Controlled Impurities
| Element | Control Purpose |
|---|---|
| Iron | Controlled to maintain grade chemistry and high-temperature behavior |
| Manganese | Controlled for processing and composition balance |
| Silicon | Controlled for oxidation behavior and alloy cleanliness |
| Phosphorus | Limited to support material quality |
| Sulfur | Limited to support hot workability and cleanliness |
| Other Residuals | Controlled according to MTC and applicable specification |
Mechanical Properties
| Product Form / Condition | Tensile Strength | Yield Strength | Elongation | Reduction of Area | Hardness |
|---|---|---|---|---|---|
| Solution-Annealed Sheet / Strip | Approx. 895 MPa min. | Approx. 380–550 MPa | 30–45% | As per MTC | As per MTC |
| Extruded Bar | Approx. 862 MPa | Approx. 310 MPa | Approx. 30% | As per MTC | HB 277 max. |
| Ready-for-Use Aerospace Material | Approx. 1005 MPa | Approx. 460 MPa | Approx. 45% | As per MTC | As per MTC |
| Forging / Ring / Billet | As per product form and MTC | As per MTC | As per MTC | As per MTC | As per MTC |
| Welding Wire | As per AMS / MTC | As per MTC | As per MTC | As per MTC | As per wire condition |
Tensile Strength
Tensile strength is important for KC20WN alloy because it shows how much load the material can carry before fracture. In hot-section and aerospace components, tensile strength supports safe performance under mechanical load and elevated temperature exposure.
Yield Strength
Yield strength shows resistance to permanent deformation under service load. KC20WN / L605 is used where parts must maintain shape and function under heat, stress, vibration and demanding engine conditions.
Elongation and Ductility
Elongation and ductility are important for forming, rolling, fabrication and component reliability. KC20WN can be formed and fabricated, but it work-hardens rapidly, so intermediate annealing may be required for complex forming operations.
Hardness
Hardness values depend on product form, cold work, solution annealing and final processing condition. Hardness testing supports machining control, wear resistance review and finished part inspection.
Density
KC20WN / L605 has a typical density around 9.1 g/cm³, making it much heavier than titanium alloys. This higher density is accepted in hot-section applications because the alloy provides strong high-temperature capability, oxidation resistance and cobalt alloy stability.
High-Temperature Strength
KC20WN / L605 is selected for high-temperature service where hot strength and stability are more important than weight reduction. It is used in gas turbine components, combustion liners, afterburner parts, rocket nozzles, turbine nozzles and hot-section assemblies.
The alloy is known for long-term high-temperature strength in demanding aerospace and industrial environments.
Oxidation Resistance
KC20WN offers oxidation resistance for aerospace, turbine, combustion and hot-gas environments. Chromium and cobalt-based alloy stability help the material perform in high-temperature oxidizing service.
For very severe oxidation environments above the common operating range, final selection should be checked against project requirements and current engineering standards.
Corrosion Resistance
KC20WN provides useful corrosion resistance in aerospace, marine, petrochemical and chemical environments. It is selected where cobalt alloy strength and environmental resistance are required together.
For aggressive aqueous corrosion service, the final material should be selected based on chemical media, concentration, temperature and corrosion data.
Wear and Galling Resistance
KC20WN / L605 is known for resistance to wear and metal galling. This makes it useful for moving, sliding or contact components where cobalt alloy behavior is required at elevated temperatures.
Wear and galling resistance are important for aerospace hardware, bearing-type components, contact parts and high-temperature assemblies.
Sulfidation Resistance
KC20WN provides sulfidation resistance in hot gas and aggressive high-temperature service. This is important for turbine, combustion and industrial environments where sulfur-containing gases may be present.
Heat Treatment
KC20WN / L605 is commonly supplied in solution-annealed condition unless otherwise specified. Solution annealing helps restore a balanced structure and supports strength, ductility and fabrication performance.
| Process | Purpose |
|---|---|
| Solution Annealing | Restores best balance of properties and structure |
| Rapid Cooling / Water Quenching | Helps achieve optimum properties after solution treatment |
| Stress Relieving | Reduces residual stress after forming or machining where required |
| Cold Working | Increases strength but may require intermediate annealing |
| Intermediate Annealing | Supports complex forming due to rapid work hardening |
Machinability and Formability
KC20WN can be machined, formed, forged, hot worked and cold worked using proper process control. Because cobalt alloys can work-harden rapidly, cutting tools, feeds, speeds and coolant selection are important.
Complex forming may require intermediate annealing. Hot working, cold working, rolling, bending and welding should follow approved procedures and material specification requirements.
Welding and Fabrication
KC20WN / L605 can be welded using suitable welding methods and matching or approved filler materials. Welding wire and electrode forms may be supplied according to applicable AMS references.
For critical aerospace and hot-section components, welding procedure, filler selection, heat input, restraint control and post-weld inspection should follow approved project documentation.
Applications of KC20WN / L605 / Haynes 25
| Application | KC20WN Use |
|---|---|
| Gas turbine parts | Hot-section hardware and turbine engine components |
| Combustion chambers | High-temperature sheet and fabricated parts |
| Afterburners | Heat-resistant aerospace assemblies |
| Guide vanes | Turbine and airflow control components |
| Turbine nozzles | Hot-gas path components |
| Rocket engine components | Rocket nozzle and thrust chamber material |
| Liquid propulsion engine parts | High-temperature propulsion components |
| Rocket thrust chamber alloy | Combustion and hot-section applications |
| Combustion liner alloy | Hot-section fabricated sheet components |
| Aerospace engine material | Military and commercial engine applications |
| Marine parts | Corrosion-resistant cobalt alloy components |
| Petrochemical components | High-temperature and corrosion-resistant parts |
| Bearing-type components | Galling-resistant cobalt alloy parts |
| Machined aerospace components | CNC-ready bars, plates, rings and blanks |
Testing, Certification and Packaging
Russian Metals supplies KC20WN / L605 / Haynes 25 / UNS R30605 materials with testing, certification and export packing support.
| Testing / Certification Point | Details |
|---|---|
| Chemical Analysis | Confirms Co, Cr, W, Ni, C, Fe, Mn, Si, P and S |
| Tensile Testing | Available for sheet, plate, bar, forging and ring material |
| Yield Strength Testing | Available where required by standard |
| Elongation Testing | Confirms ductility and product condition |
| Hardness Testing | Supports machining and finished part control |
| Dimensional Inspection | Thickness, width, length, diameter and tolerance checks |
| Surface Inspection | Confirms finish, cleanliness and visible surface quality |
| Ultrasonic Testing | Available for selected plates, bars, billets, forgings and rings |
| PMI Testing | Positive material identification where required |
| Material Certificate | MTC with heat number and chemical analysis |
| Heat Number | Heat-level material traceability |
| Batch Traceability | Batch identification from supply to packing |
| Grade Marking | KC20WN, L605, Haynes 25, Alloy 25 or UNS R30605 marking |
| Export Packaging | Wooden box, bundle packing, wrapped protection or project-specific packing |
Grade Comparison Table
| Grade / Name | Material Type | UNS / W.Nr. | Main Alloy System | Key Benefit | Typical Application |
|---|---|---|---|---|---|
| KC20WN | Cobalt-based superalloy | UNS R30605 / W.Nr. 2.4964 | Co-Cr-W-Ni | High-temperature strength | Aerospace and gas turbine hot-section parts |
| L605 | Cobalt base alloy | UNS R30605 | Co-20Cr-15W-10Ni | Oxidation resistance and hot strength | Combustion chambers and afterburners |
| Haynes 25 | Cobalt superalloy | UNS R30605 | Co-Cr-W-Ni | Galling and sulfidation resistance | Turbine and aerospace engine components |
| Alloy 25 | Cobalt chromium tungsten nickel alloy | UNS R30605 | Co-20Cr-15W-10Ni | Fabricability and high-temperature performance | Sheet, bar, wire, forging and ring products |
Equivalent Grade Note
KC20WN is commonly connected with L605, Haynes 25, Alloy 25, UNS R30605 and W.Nr. 2.4964. Final equivalence should always be confirmed by material certificate, chemical composition, applicable standard and project specification.
For aerospace and engine components, the required specification such as AMS 5537, AMS 5759, AMS 5796 or AMS 5797 should be clearly confirmed before production or supply.
FAQs
What is KC20WN alloy?
▾
KC20WN is a cobalt-based superalloy used for high-temperature aerospace, gas turbine, rocket engine, combustion chamber and hot-section applications.
Is KC20WN a titanium alloy?
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No. KC20WN is not a titanium alloy. It is a cobalt-based superalloy with cobalt as the base element and chromium, tungsten and nickel as major alloying elements.
What is KC20WN equivalent to?
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KC20WN is commonly connected with L605, Haynes 25, Alloy 25, UNS R30605 and W.Nr. 2.4964.
Is KC20WN the same as L605?
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KC20WN is commonly treated as a related or equivalent designation to L605, but final equivalence should be confirmed by MTC, composition and required standard.
Is KC20WN the same as Haynes 25?
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KC20WN is commonly connected with Haynes 25 / Alloy 25. Final material matching should be checked through specification, chemical composition and certificate.
What is UNS R30605?
▾
UNS R30605 is the international UNS designation commonly associated with L605 / Haynes 25 / Alloy 25 cobalt-based superalloy.
What is the chemical composition of KC20WN?
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KC20WN typically contains cobalt balance with about 19–21% chromium, 14–16% tungsten, 9–11% nickel, controlled carbon and limited iron, manganese, silicon, phosphorus and sulfur.
What are the main elements in KC20WN alloy?
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The main elements in KC20WN are cobalt, chromium, tungsten and nickel.
What are the mechanical properties of KC20WN?
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Mechanical properties depend on product form and condition. Typical solution-annealed material may show high tensile strength, useful yield strength and good elongation for high-temperature fabrication and aerospace applications.
What is KC20WN used for?
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KC20WN is used for gas turbine parts, combustion chambers, afterburners, guide vanes, turbine nozzles, rocket engine components, hot-section assemblies and high-temperature machined parts.
Is KC20WN used in aerospace applications?
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Yes, KC20WN / L605 / Haynes 25 is used in aerospace applications, especially for hot-section and gas turbine engine components.
Is KC20WN used in rocket engine components?
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Yes, KC20WN can be used for rocket engine applications such as rocket nozzles, thrust chambers, combustion parts and liquid propulsion engine components where high-temperature strength is required.
What product forms are available in KC20WN?
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Russian Metals supplies KC20WN in sheet, plate, strip, foil, bar, rod, wire, welding wire, forging, ring, billet and machined blank forms.
What standards apply to KC20WN / L605?
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Common standards and designations include AMS 5537 for sheet, strip and plate, AMS 5759 for bar and forging stock, AMS 5796 for welding wire, AMS 5797 for welding electrodes, UNS R30605 and W.Nr. 2.4964.
What is the difference between KC20WN and titanium alloys?
▾
KC20WN is cobalt-based and much denser than titanium alloys. Titanium alloys are lighter, while KC20WN offers stronger high-temperature capability, oxidation resistance and hot-section performance in many aerospace and turbine applications.
KC20WN / L605 / Haynes 25 Cobalt Superalloy with MTC and Export Support
Send the required alloy designation, product form, dimensions, quantity, standard, delivery condition, testing, certificate requirements and destination for a technically correct quotation.
KC20WN / L605 / Haynes 25 cobalt-based superalloy supply support.
Chemical, mechanical, heat-treatment and inspection documentation.
Product-form, cut-to-size, forging and drawing-based supply support.
Export packaging and international delivery assistance.