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Nickel Alloy Grade Data Sheet

Cobalt STELLITE-6B

STELLITE® 6B is a wrought cobalt-chromium-tungsten alloy with excellent resistance to abrasion, erosion, cavitation, galling and seizing. Its hot hardness, dimensional stability and corrosion resistance remain useful at elevated temperatures, while the wrought structure provides better ductility and impact resistance than comparable cast wear alloys. Typical applications include valve seats and gates, pump shafts, bushings, sleeves, bearing surfaces, erosion shields, turbine hardware, sliding wear components and parts operating where lubrication is limited.

 

 

 

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Material Overview

Cobalt STELLITE-6B 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

STELLITE® 6B is a wrought cobalt-chromium-tungsten alloy with excellent resistance to abrasion, erosion, cavitation, galling and seizing. Its hot hardness, dimensional stability and corrosion resistance remain useful at elevated temperatures, while the wrought structure provides better ductility and impact resistance than comparable cast wear alloys. Typical applications include valve seats and gates, pump shafts, bushings, sleeves, bearing surfaces, erosion shields, turbine hardware, sliding wear components and parts operating where lubrication is limited.

 

 

 

Cobalt STELLITE-6B

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 STELLITE-6B 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, wt.% Role in STELLITE 6B
Cobalt Co Balance Forms the tough cobalt-base matrix for hot wear service.
Chromium Cr 28.0-32.0 Provides corrosion resistance and contributes to hard carbide formation.
Tungsten W 3.5-5.5 Strengthens the matrix and improves hot hardness and wear resistance.
Carbon C 0.90-1.40 Forms hard chromium-tungsten carbides that resist abrasive wear.
Nickel Ni 3.0 max Controlled residual element affecting matrix stability.
Iron Fe 2.0 max Controlled residual element.
Silicon Si 2.0 max Controlled processing and residual element.
Manganese Mn Controlled residual May be present as a controlled minor element.
Molybdenum Mo Controlled residual May be present as a controlled minor element.

 

 

 

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 / Notes
Density Approximately 8.39 g/cm3 Approximately 0.303 lb/in3 Wrought STELLITE 6B
Melting Range 1265-1354 °C 2310-2470 °F Typical range
Thermal Conductivity Approximately 14.7 W/m·°C Approximately 0.147 W/cm·°C Representative room-temperature value
Elastic Modulus Approximately 220-230 GPa Approximately 32-33 x 103 ksi Representative cobalt-alloy range
Mean Coefficient of Thermal Expansion Approximately 13-15 µm/m·°C Temperature dependent Representative wrought cobalt-alloy range
Specific Heat Approximately 420-500 J/kg·°C Temperature dependent Representative range
Electrical Resistivity Approximately 0.9-1.1 µΩ·m Approximately 90-110 µΩ·cm Representative range; condition dependent
Hot Hardness Retains useful hardness at elevated temperature Exact value depends on temperature and test method One of the principal reasons for selecting 6B

 

 

 

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 / Condition Tensile Strength Yield Strength, 0.2% Elongation Reduction of Area / Hardness
Wrought sheet, plate and bar per AMS 5894 896 MPa min 483 MPa min 5% min 7% min; 33-43 HRC
Typical wrought 6B, room temperature Approximately 900-1100 MPa Approximately 480-700 MPa Approximately 5-15% Approximately 33-43 HRC
Typical wear-component condition Condition dependent Condition dependent Condition dependent Approximately 380-450 HV, depending on processing
High-temperature wear service Strength and hardness decrease progressively with temperature Carbide-strengthened wear resistance remains useful at elevated temperature
Cold-worked or locally machined component Properties depend on work hardening, section size and machining history Verify final hardness and dimensional stability on the finished component
AMS 5894 minimum values apply to specified wrought products. Actual properties are not guaranteed for every size, shape, casting, weld overlay or finished component.

 

 

 

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 STELLITE-6B 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
Wrought Sheet, Plate and Bar AMS 5894 Wrought STELLITE 6B with specified tensile, yield, elongation, reduction-of-area and hardness requirements Confirm thickness, diameter, grain structure, inspection and current revision.
Aerospace Components Boeing BMS 7-338 Customer-specific aerospace material and component requirements Verify the applicable Boeing drawing and revision.
Aerospace Components Pratt & Whitney PWA 1196 OEM material or component requirements for selected aerospace applications Use only when required by the component drawing or purchase specification.
Aerospace Components Pratt & Whitney PWA 300 / MCL / LCS Project-specific OEM references Confirm approved product form, inspection and traceability requirements.
Wrought Wear Components Manufacturer and drawing specification Machined sleeves, bushings, seats, erosion shields and other finished components Define hardness, dimensions, surface finish, runout and wear-test requirements.
Pipe, Tube and Fittings No ordinary general-purpose STELLITE 6B specification listed Custom or drawing-based components only Confirm forging, machining, joining and inspection route before ordering.
Welding and Hardfacing Project-specific qualified welding procedure Joining or repair of 6B and dissimilar cobalt, nickel or iron-base materials Do not assume a hardfacing wire or cast STELLITE 6 filler is equivalent to wrought 6B.
Inspection Purchase specification and OEM requirements Chemical analysis, tensile testing, hardness, dimensional inspection and NDE where specified Agree acceptance criteria before production of finished components.
Heat Treatment Product and drawing-specific Wrought 6B is supplied in the specified forged and heat-treated condition Do not apply an age-hardening cycle intended for precipitation-hardened alloys.

 

 

 

Available Product Forms

Cobalt STELLITE-6B 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 machined or fabricated tubular components to drawing Wrought, forged or project-specific supply Wear sleeves, valve components and specialty high-temperature assemblies View Pipe & Tube
Round Bar Approximately 7.9-152.4 mm diameter; additional sizes by inquiry Hot forged, wrought, machined or ground Bushings, sleeves, pump shafts, valve seats and wear parts View Round Bar
Sheet & Plate Approximately 0.79-25.4 mm thick, custom widths and lengths Wrought, hot forged, solution treated or cut to size Erosion shields, wear plates, valve components and sliding surfaces View Sheet & Plate
Strip & Foil Precision strip and thin stock in custom slit widths Wrought and machined to project requirements Wear shims, seals and special erosion-resistant components View Strip & Foil
Wire Custom wire and welding-wire diameters Wrought, drawn or supplied for qualified joining procedures Repair, wear strips and special fabricated parts View Wire
Fasteners Custom bolts, nuts, studs, screws and wear-resistant hardware Machined from qualified wrought stock High-temperature valves, turbine assemblies and anti-galling joints View Fasteners
Fittings Custom wear fittings, adapters and connectors to drawing Machined or fabricated from wrought stock Valve systems, pump equipment and erosive-service lines View Fittings
Flanges Custom forged rings and machined flange components Forged, machined and inspected to project requirements High-temperature piping and specialty equipment connections View Flanges
Forgings Rings, discs, blocks and custom hot forgings Hot forged, wrought and machined as specified Valve seats, turbine hardware, pump parts and wear-resistant structures View Forgings
Welding Wire Custom filler-wire diameters and straight lengths Qualified cobalt-alloy wire for repair or hardfacing procedures Joining, repair overlays and dissimilar-material fabrication View Welding Wire

 

 

 

Material Selection Guide

When to consider Cobalt STELLITE-6B

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 / Material Selection Strength Typical Position Selection Note
STELLITE® 6B Wrought structure, strong carbide wear resistance, excellent galling and cavitation resistance Valve seats, bushings, sleeves, pump shafts and sliding wear components Select when wear, dimensional stability and ductility must be balanced.
STELLITE® 6 General-purpose cast cobalt alloy with broad hardfacing availability Cast or hardfaced valve and pump components Choose cast 6 for economical hardfacing; choose 6B when wrought ductility and impact performance are required.
STELLITE® 6K Higher hardness and stronger abrasive-wear resistance Severe abrasion and high-load wear surfaces Compare toughness, impact loading and machining requirements before selection.
HAYNES® 25 / L-605 Higher ductility and hot strength with lower carbide wear hardness Bearings, springs and aerospace hot-section hardware Choose L-605 for structural hot strength; choose 6B for severe sliding, galling or erosion.
HAYNES® 188 Improved oxidation resistance and thermal stability Combustion liners and high-temperature fabricated parts Select when prolonged oxidation exposure is more important than maximum wear resistance.
Tribaloy® T-400 Excellent high-temperature sliding wear with low dependence on lubrication High-temperature bearing and tribological components Compare galling, corrosion, impact and manufacturing route for the specific application.

 

 

 

Why Choose Us

Supply and quality support for Cobalt STELLITE-6B

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.

Related Nickel Alloys

Compare nearby grades and product forms

Explore related grades and product forms for comparison.

FAQ

Cobalt STELLITE-6B questions from buyers

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

STELLITE 6B is used for valve seats and gates, pump shafts, sleeves, bushings, bearings, erosion shields, cavitation-resistant parts, sliding wear components and assemblies exposed to galling, abrasion or limited lubrication.

No. STELLITE 6B is a wrought, hot-forged product with enhanced ductility and mechanical properties. STELLITE 6 is generally supplied as a cast alloy or hardfacing material. Their chemistry is similar, but the manufacturing route, microstructure, mechanical properties and applicable specifications are different.

STELLITE 6B is commonly identified as UNS R30016 and is covered for specified wrought products by AMS 5894. The exact material certificate should state the UNS designation, product form, specification and inspection condition.

Typical AMS 5894 minimum requirements for STELLITE 6B include 896 MPa tensile strength, 483 MPa 0.2% yield strength, 5% elongation, 7% reduction of area and 33-43 HRC hardness. The applicable revision and product size control the final acceptance requirements.

STELLITE 6B can be joined or repaired with qualified cobalt-alloy welding procedures, but welding can change local hardness, carbide distribution and dimensional stability. Filler selection, heat input, preheating, interpass control and post-weld inspection must be selected for the base material and service.

STELLITE 6B retains useful hot hardness and wear resistance at elevated temperatures, with a typical melting range of 1265-1354 °C. The allowable service temperature depends on load, wear mode, oxidation, corrosion, thermal cycling and dimensional requirements; the melting range is not a design temperature.

We can quote wrought round bar, sheet, plate, fabricated shapes, forgings and machined wear components. Pipe, tube, fittings, flanges, fasteners and welding wire can be discussed as custom or drawing-based products, subject to manufacturing and inspection qualification.

Please send the grade or UNS number, product form, dimensions, quantity, applicable AMS or OEM specification, hardness and tensile requirements, wear mode, operating temperature, mating material, lubrication condition, surface finish, inspection plan and destination.

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