Cobalt-Chrome Alloy Stellite 6B
UNS R30016
Stellite 6B is the wrought counterpart of cast Stellite 6 (UNS R30016), a Co-Cr-W alloy rolled into sheet, strip and bar in solution-annealed, hot-rolled or aged conditions.
Reference datasheet — Stellite 6B is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the SA condition
Stellite 6B tempers and conditions
Stellite 6B is supplied in 3 conditions, soft to hard. SA is the default FabDigit quotes; the values on this page are for it.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SADefault Solution heat treated (mill annealed), plate/bar per AMS 5894 | Standard stocked condition: best combination of toughness and wear resistance for valve seats, wear rings and bushings. | 620 | 1,000 | 8 | 38 HRC | — |
Hot rolled | Thicker plate and bar stock for machined seat rings and wear pads where a mill-finish surface is acceptable. | 630 | 1,000 | 7 | 39 HRC | 1.9 % IACS |
Solution treated + precipitation aged | Choose when maximum hardness and abrasive wear life matter more than impact toughness or ductility. | 740 | 1,100 | 3 | 45 HRC | 2 % IACS |
Supply forms, finishes and certifications
Ways Stellite 6B is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
SHEET | Sheet/Strip | Supply form |
What is Stellite 6B?
Stellite 6B is the wrought counterpart of cast Stellite 6 (UNS R30016), a Co-Cr-W alloy rolled into sheet, strip and bar in solution-annealed, hot-rolled or aged conditions. Typical properties are 620 MPa yield, 1000 MPa tensile, 8 % elongation and 38 HRC, with service to 800 °C, so it can be sheared, gently formed and welded into rings rather than cast or overlaid. Formability is still low (rating 15) and machining is limited to grinding, EDM or slow carbide turning. Choose cast Stellite 6 or PTA overlay when a wrought form is not needed. Stellite 6B has a density of 8.38 g/cm³ (0.303 lb/in³), lighter than 61% of cobalt-chrome alloy grades. It melts at 1,265°C (2,309 °F). Stellite 6B has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 67% of cobalt-chrome alloy grades. Elongation at break is 8% and the elastic modulus is 230 GPa (33.4 Msi).
What is Stellite 6B used for?
- valve seat rings
- wear rings
- check valve components
Stellite 6B properties
Typical room-temperature values for Stellite 6B-SA; bars are the position among cobalt-chrome alloy grades.
Physical3
Stellite 6B has a density of 8.38 g/cm³ (0.303 lb/in³), lighter than 61% of cobalt-chrome alloy grades. It melts at 1,265°C (2,309 °F).
Mechanical15
Stellite 6B has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 67% of cobalt-chrome alloy grades. Elongation at break is 8% and the elastic modulus is 230 GPa (33.4 Msi).
Thermal6
Stellite 6B is rated for continuous service to 800°C (1,472 °F). It conducts heat at 14.8 W/m·K (8.55 BTU/hr·ft·°F), better than 84% of cobalt-chrome alloy grades. Thermal expansion is 12.5 µm/m·K (6.94 µin/in·°F).
Electrical3
Stellite 6B conducts electricity at 1.9 % IACS, worse than 52% of cobalt-chrome alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (72/100), worse than 61% of cobalt-chrome alloy grades.
Sustainability4
Producing a kilogram of Stellite 6B takes about 210 MJ of energy and emits 15 kg of CO₂ — more than 80% of cobalt-chrome alloy grades. Typical recycled content is 25%.
Manufacturability6
Stellite 6B's machinability is not recommended (8/100, worse than 64% of cobalt-chrome alloy grades); weldability poor (25/100); formability poor (15/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the cobalt-chrome alloy family
Yield strength against density for every cobalt-chrome alloy grade FabDigit runs. Stellite 6B is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Stellite 6B
Is Stellite 6B easy to machine?
Treat as a hardfacing alloy: grinding, EDM or waterjet preferred; if turning, use rigid setups, negative-rake carbide/CBN, low speed (5–15 m/min), heavy positive feed and flood coolant to avoid work hardening.
Can Stellite 6B be welded?
GTAW/PTA with matching Stellite 6 filler; preheat 300–500 °C, low heat input and slow cooling to limit carbide-network cracking, stress relieve after welding.
Can Stellite 6B be formed, bent or molded?
Hot form at 1050–1150 °C; cold forming limited to gentle bends in thin annealed strip with generous radii — the carbide network cracks under tight bends.
Stellite 6B chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Cforms Cr7C3/M23C6 carbides | 0.9 – 1.4 | 1.1 |
| Cr | 28 – 32 | 30 |
| W | 3.5 – 5.5 | 4.5 |
| Ni | ≤ 3 | 1.5 |
| Fe | ≤ 3 | 1.5 |
| Si | ≤ 2 | 0.7 |
| Mn | ≤ 2 | 1.4 |
| Mo | ≤ 1.5 | 0.5 |
| Cobalance, ~57–60 % | balance |
What surface finishes work on Stellite 6B?
Lapped/ground to mirror seal faces; no anodizing (non-aluminium); passivates naturally through its 30 % Cr, so plating or coating is rarely needed.
Equivalent designations
Standards and trade names that resolve to Cobalt-Chrome Alloy Stellite 6B in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- R30016
How much does Stellite 6B cost?
Stellite 6B is a high-cost cobalt-chrome alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Stellite 6B — frequently asked
What is Stellite 6B used for?
Stellite 6B is typically used for valve seat rings, wear rings and check valve components. In short: wrought, formable Stellite; ductile hardfacing alloy; sheet and strip availability.
What is the yield strength of Stellite 6B?
Stellite 6B has a typical yield strength of 620 MPa (89.9 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 67% of cobalt-chrome alloy grades. Strength varies by condition: see the 3 listed tempers.
Is Stellite 6B easy to machine?
Not especially — machinability is rated not recommended (8/100, worse than 64% of cobalt-chrome alloy grades). Treat as a hardfacing alloy: grinding, EDM or waterjet preferred; if turning, use rigid setups, negative-rake carbide/CBN, low speed (5–15 m/min), heavy positive feed and flood coolant to avoid work hardening.
Can Stellite 6B be welded?
Not readily — weldability is rated poor (25/100). GTAW/PTA with matching Stellite 6 filler; preheat 300–500 °C, low heat input and slow cooling to limit carbide-network cracking, stress relieve after welding.
What surface finishes work on Stellite 6B?
Lapped/ground to mirror seal faces; no anodizing (non-aluminium); passivates naturally through its 30 % Cr, so plating or coating is rarely needed.
Can Stellite 6B be formed, bent or molded?
Hot form at 1050–1150 °C; cold forming limited to gentle bends in thin annealed strip with generous radii — the carbide network cracks under tight bends.
What is the maximum service temperature of Stellite 6B?
Stellite 6B is rated for continuous use to about 800°C (1,472 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Stellite 6B-SA and Stellite 6B Aged?
SA is the default condition — standard stocked condition: best combination of toughness and wear resistance for valve seats, wear rings and bushings. Aged: choose when maximum hardness and abrasive wear life matter more than impact toughness or ductility. Yield strength is 620 MPa in SA versus 740 MPa in Aged.
How much does Stellite 6B cost?
Stellite 6B is a high-cost cobalt-chrome alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- AMS 5894 — Cobalt Alloy, Corrosion and Heat Resistant, Sheet, Strip, Plate and Bar (Stellite 6B, UNS R30016) — SAE International (2018)
- Stellite 6B wrought alloy technical data — Kennametal Stellite / Deloro (2021)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials (Cobalt-base wear alloys) — ASM International (1990)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.