Cobalt-Chrome Alloy Stellite 6 · supply condition
Cobalt-Chrome Alloy Stellite 6 Hot Worked
Properties of the Hot Worked condition, compared with the other Stellite 6 tempers.
Choose when some ductility and toughness are needed alongside wear resistance (bushings, blades, wear plate); carbides are broken up and aligned.
What is Stellite 6 Hot Worked?
Stellite 6 Hot Worked is Stellite 6 supplied in the Hot Worked condition — choose when some ductility and toughness are needed alongside wear resistance (bushings, blades, wear plate); carbides are broken up and aligned. Stellite 6 Hot Worked has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 59% of cobalt-chrome alloy grades. Elongation at break is 9% and the elastic modulus is 220 GPa (31.9 Msi). Stellite 6 Hot Worked has a density of 8.44 g/cm³ (0.305 lb/in³), heavier than 50% of cobalt-chrome alloy grades. It melts at 1,285°C (2,345 °F). As Cast is the default condition FabDigit quotes; Hot Worked is available on request or by drawing note.
Advantages
- Readily welded — 55/100, better than 81% of cobalt-chrome alloy grades
Stellite 6 Hot Worked properties
Typical room-temperature values for Stellite 6 Hot Worked — 13 properties are specific to this condition; the rest are grade-level values shared by every Stellite 6 temper. Each bar shows where the value sits among the cobalt-chrome alloy grades in FabDigit's library — further right is higher.
Physical3
Stellite 6 Hot Worked has a density of 8.44 g/cm³ (0.305 lb/in³), heavier than 50% of cobalt-chrome alloy grades. It melts at 1,285°C (2,345 °F).
Mechanical13
Stellite 6 Hot Worked has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 59% of cobalt-chrome alloy grades. Elongation at break is 9% and the elastic modulus is 220 GPa (31.9 Msi).
Thermal5
Stellite 6 Hot Worked 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 6 Hot Worked conducts electricity at 1.9 % IACS, worse than 54% of cobalt-chrome alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (70/100), worse than 72% of cobalt-chrome alloy grades.
Sustainability4
Producing a kilogram of Stellite 6 Hot Worked takes about 150 MJ of energy and emits 13 kg of CO₂ — less than 60% of cobalt-chrome alloy grades. Typical recycled content is 30%.
Manufacturability8
Stellite 6 Hot Worked's machinability is not recommended (10/100, better than 53% of cobalt-chrome alloy grades); weldability good (55/100); formability not recommended (10/100).
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other Stellite 6 tempers and conditions
Stellite 6 is also supplied in 5 other conditions. The full side-by-side table is on the Stellite 6 overview.
- As CastDefaultDefault supply form for valve trim, seat rings and cast wear parts; maximum carbide content, lowest ductility.541 MPa yield · 40 HRC
- Hot WorkedChoose when some ductility and toughness are needed alongside wear resistance (bushings, blades, wear plate); carbides are broken up and aligned.620 MPa yield · 38 HRC
Working with Stellite 6 Hot Worked
Is Stellite 6 easy to machine?
Treat as a grinding/EDM material — cast Stellite 6 at 40 HRC work-hardens and abrades tools; if turning, use negative-rake CBN or C2 carbide, rigid setup, low speed (10–25 m/min), heavy feed and flood coolant.
Can Stellite 6 be welded?
Deposit by GTAW, PTA, oxy-acetylene or laser cladding with 200–350 °C preheat and slow cooling; expect fine transverse check cracks (usually acceptable), and use 2+ layers or a buffer layer on carbon/low-alloy steel to limit iron dilution.
Can Stellite 6 be formed, bent or molded?
No practical cold forming — parts are cast to near-net shape, PM/HIP consolidated, printed, or hot worked above ~1100 °C in the wrought grade.
What surface finishes work on Stellite 6?
Finish by wet grinding, lapping or superfinishing for valve-seat flatness; do not anodize — surfaces are used bare or lightly passivated, and the alloy takes a mirror polish that improves erosion/sealing life.
Stellite 6 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 |
|---|---|---|
| Cr | 27 – 32 | 29 |
| W | 3.5 – 5.5 | 4.5 |
| Cforms Cr7C3 / M23C6 and W-rich carbides | 0.9 – 1.4 | 1.1 |
| Ni | ≤ 3 | 1 |
| Fe | ≤ 3 | 1.5 |
| Si | ≤ 2 | 1.1 |
| Mn | ≤ 2 | 1 |
| Mo | ≤ 1.5 | 0.5 |
| Cobalance, ~57–60 % | balance | — |
Stellite 6 Hot Worked — frequently asked
What is Stellite 6 Hot Worked used for?
Stellite 6 Hot Worked is typically used for valve seats and valve trim, hardfacing rods and welding wire, pump sleeves and wear rings, extruder and screw flight overlays, cutting knives and saw teeth and bearing bushings and thrust washers. In short: hardfacing cobalt alloy.
What is the yield strength of Stellite 6 Hot Worked?
Stellite 6 Hot Worked has a typical yield strength of 620 MPa (89.9 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 59% of cobalt-chrome alloy grades. Strength varies by condition: see the 6 listed tempers.
Is Stellite 6 Hot Worked easy to machine?
Not especially — machinability is rated not recommended (10/100, better than 53% of cobalt-chrome alloy grades). Treat as a grinding/EDM material — cast Stellite 6 at 40 HRC work-hardens and abrades tools; if turning, use negative-rake CBN or C2 carbide, rigid setup, low speed (10–25 m/min), heavy feed and flood coolant.
Can Stellite 6 Hot Worked be welded?
Yes — weldability is rated good (55/100). Deposit by GTAW, PTA, oxy-acetylene or laser cladding with 200–350 °C preheat and slow cooling; expect fine transverse check cracks (usually acceptable), and use 2+ layers or a buffer layer on carbon/low-alloy steel to limit iron dilution.
What surface finishes work on Stellite 6 Hot Worked?
Finish by wet grinding, lapping or superfinishing for valve-seat flatness; do not anodize — surfaces are used bare or lightly passivated, and the alloy takes a mirror polish that improves erosion/sealing life.
Can Stellite 6 Hot Worked be formed, bent or molded?
No practical cold forming — parts are cast to near-net shape, PM/HIP consolidated, printed, or hot worked above ~1100 °C in the wrought grade.
What is the maximum service temperature of Stellite 6 Hot Worked?
Stellite 6 Hot Worked 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 6 As Cast and Stellite 6-HIP?
As Cast is the default condition — default supply form for valve trim, seat rings and cast wear parts; maximum carbide content, lowest ductility. HIP: choose for near-net-shape parts needing uniform fine carbides, higher strength and better toughness than cast Stellite 6. Yield strength is 541 MPa in As Cast versus 680 MPa in HIP.
Can FabDigit make parts in Stellite 6 Hot Worked?
Yes — Stellite 6 Hot Worked is available for CNC machining and sheet metal with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- Stellite 6 Alloy Technical Data — Kennametal Stellite (Deloro) (2021)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials (Cobalt alloys) — ASM International (1990)
- AWS A5.21 / A5.13 — Bare and covered hardfacing electrodes (ERCCoCr-A, RCoCr-A) — AWS (2021)
- ASTM A560 / UNS R30006 cobalt-chromium-tungsten alloy castings — ASTM (2019)
- ASM Handbook Vol.19 — Fatigue and Fracture (hardfacing alloys) — ASM International (1996)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.