Cobalt and Cobalt-Based Alloys

BMI supplies a specialized range of Cobalt and Cobalt-based alloys engineered for extreme operating environments where heat, wear, and corrosion resistance are critical.

These materials maintain strength and surface stability at temperatures exceeding 1000°C, making them indispensable for gas turbines, cutting tools, prosthetic implants, and chemical process equipment.

SPECIFICATIONS FOR EVERY REQUIREMENT.

GRADES

Stellite 6 / 12 / 21
Haynes 188
L-605 (Alloy 25)
FSX-414
MP35N
T-400 / T-800
Vitallium
Mar-M 509 / 918

Specialty grades available upon request.

PRODUCT RANGE

Rods & Bars: Precision forged bars for turbine and aerospace applications
Sheets & Plates: Hot-rolled & cold-finished cobalt alloy sheets (AMS, ASTM standards)
Wires: MP35N & Vitallium wire for medical and dental use
Castings: FSX & Stellite castings for wear and high-temp service
Flanges & Fittings: Machined corrosion- and heat-resistant components
Powder Metallurgy Grades: For additive manufacturing and hardfacing

STANDARDS

L-605, Haynes 188 sheet & bar - AMS 5759 / 5796 / 5801
MP35N bar & wire - AMS 5844 / 5845
Co–Cr–Mo alloys for surgical implants - ASTM F1537
Vitallium & biomedical cobalt alloys - ASTM F90 / F75
Wrought & forged cobalt alloys - ASTM B191 / B564
Common cobalt alloy grades - UNS R30006, R30008, R30035
Co–Cr–Mo implant materials - ISO 5832-12

MAKE

We source and stock products regularly from:

Haynes International (USA) – Haynes 188, L-605, Stellite
Deloro Stellite (Canada) – Stellite series 6, 12, 21, 31
Carpenter Technology (USA) – MP35N, Elgiloy, BioDur CoCr
ATI Specialty Alloys (USA) – FSX-414, L-605
VSMPO (Russia) – Cobalt–Nickel based forged bars under GOST standards
VDM Metals GmbH (Germany) – Co–Cr–W–Mo high-temperature alloys

Specific Makes are available upon request

MTC is always provided when you choose BMI

QUALITY PARAMETERS SET BY BMI

Outstanding high-temperature and oxidation resistance
Excellent galling, wear, and corrosion resistance
Retains hardness and strength up to 1100°C
Superior biocompatibility (for Co–Cr–Mo medical alloys)
Nonmagnetic and high fatigue resistance (MP35N)
Stable in thermal cycling and oxidative atmospheres

CHEMICAL COMPOSITION

Element Stellite 6 Haynes 188 L-605 MP35N Vitallium

Cobalt (Co) Balance Balance Balance 35 Balance

Chromium (Cr) 27–30 22 20 20 27–30

Nickel (Ni) 2.5 22 10 35 —

Tungsten (W) 4.5–5.5 141 5 — —

Molybdenum (Mo) — 2 — 10 5–6

Iron (Fe) ≤3 ≤3 ≤3 1 ≤1

Carbon (C) 1.0–1.4 0.1 0.1 ≤0.025 0.25–0.35

Manganese (Mn) ≤1 ≤1.25 ≤1.5 1 ≤1

Silicon (Si) ≤1.2 ≤0.4 ≤0.4 0.15 ≤1

Others W, Mo, Fe La, W W, Fe Ti, Nb —

MECHANICAL PROPERTIES

Property Stellite 6 Haynes 188 L-605 MP35N (aged) Vitallium

Tensile Strength (MPa) 950 870 980 1790 900

Yield Strength (MPa) 500 400 410 1550 520

Elongation (%) 1-2 45 40 40 10

Hardness (HRC) 43–47 25 25 50+ 35

Density (g/cm³) 8.4 8.33 9.1 8.43 8.3

Max Service Temp (°C) 870 1100 980 450 980

INDUSTRY APPLICATIONS.

Aerospace & Gas Turbines: Combustor liners, turbine vanes, nozzle guide rings
Medical Devices: Surgical implants, stents, dental prosthetics (Vitallium, MP35N)
Power & Energy: Combustion chambers, bearings, high-temp valves
Oil & Gas: Springs, connectors, high-pressure fittings
Industrial Wear Components: Valve seats, cutting tools, pump sleeves