High Cobalt Alloys

High cobalt alloys are metal alloys primarily composed of cobalt, known for their exceptional wear resistance, corrosion resistance, and strength at elevated temperatures. These alloys are widely used in demanding industrial applications such as aerospace, medical implants, and power generation where durability and reliability under extreme conditions are critical.

Factory Generated Scrap

Sheet & plate factory rejections, prime offcuts ,Pre-cut sheets, standard half-size lots, Cuttings, punchings, small pieces.

Turnings/Borings

Machining byproducts (e.g., from turning, milling, drilling) in forms like loose, bundled, or crushed chips, generated during production

HS6B (Alloy 6B)

Features:

Exceptional wear, galling, abrasion, and erosion resistance, especially where lubrication is limited or absent
High retention of hardness and strength at elevated temperatures (approaching 1093°C/2000°F)
Maintains mechanical properties after repeated thermal cycling
Excellent corrosion and oxidation resistance in aggressive environments
Non-magnetic

Applications:
Steam and gas turbine components (e.g., blades, erosion shields), cutting tools, knives, scrapers, Pump and valve components, bearing assemblies, extrusion dies, furnace fan blades, food processing and textile industry blades

Heat Treatment:

Temperature: Heat to 2250°F (1232°C)
Process: Air cool to room temperature
Purpose: Ensures uniform microstructure, maximizes toughness, and preserves high wear and corrosion resistance. Properties are not significantly improved by cold working or age hardening—the alloy retains high hardness even after heating to “red heat” and cooling

HS6B (Cobalt Alloy 6B) is a wrought cobalt-chromium-tungsten alloy engineered for severe wear environments where seizing, galling, abrasion, and erosion are common concerns. Unlike many alloys, its impressive wear resistance is inherent to its composition and not reliant on cold working or heat treatment processes, making it highly reliable in demanding applications. HS6B maintains exceptional hardness and mechanical stability at elevated temperatures, exhibiting excellent impact, thermal shock, and cavitation erosion resistance, as well as strong resistance to oxidation and a range of corrosive media. Its low coefficient of friction helps minimize metal pickup and allows sliding contact with other alloy or metal surfaces, providing reliable performance where lubrication is impractical. Commonly used in turbine erosion shields, cutting tools, valve components, pump parts, and forming dies, HS6B is a preferred material in industries such as power generation, chemical processing, and manufacturing where durability under harsh conditions is essential.

Cobalt (Co): 60-67%

Chromium (Cr)28-32%

Tungsten (W) 4.5-5.5%

Carbon (C)1.15-1.4%

Silicon (Si) ≤1.1

Iron (Fe)≤0.03

Nickel (Ni)≤0.03

Power Generation: Steam turbine erosion shields and blades, bearing assemblies for heat treat furnaces

Chemical Processing: Valves, pumps, and nozzles exposed to corrosive media and slurry erosion, mixer blades in aggressive environments

Food Processing: Industrial scraper blades, cutting knives, and chopper blades for minimal metal loss

Oil and Gas: Pump plungers, valve stems, and nozzles in abrasive fluid environments

Wastewater Treatment: Scraper blades and knives for solids handling and abrasion resistance

Glass Manufacturing: Furnace nozzles, molding dies, conveyor rollers, and shear blades

ASTM F75 (CoCrMo)

Features:

Outstanding wear resistance and high strength
Excellent corrosion and oxidation resistance
High biocompatibility—FDA/ISO-approved for use in medical implants
Maintains structural integrity and performance in harsh physiological environments

Applications:
Orthopedic implants: hip and knee prostheses, bone plates, and screws, dental implants and prostheses, surgical tools and instrument components, biomedical devices: heart valves, stents, other critical implant devices

Heat Treatment:
ASTM F75 cobalt alloy is typically solution heat treated around 1220°C (2230°F) for about one hour followed by rapid quenching to dissolve carbides, homogenize the microstructure, and improve ductility and corrosion resistance for medical and industrial applications.

ASTM F75 is a cobalt-chromium-molybdenum alloy known for its exceptional wear resistance, corrosion resistance, and high biocompatibility, making it a preferred material for orthopedic and dental implants, surgical instruments, and other biomedical devices. Its balanced composition provides excellent mechanical strength and durability in harsh physiological environments, while maintaining a polished, corrosion-resistant surface that supports long-term implantation and performance. ASTM F75 alloy is widely used in hip and knee prostheses, dental restorations, and minimally invasive surgical tools, reflecting its critical role in medical applications where reliability and bio-inertness are paramount.

Cobalt (Co)Balance (60–65)

Chromium (Cr)27–30%

Molybdenum (Mo)5–7%

Carbon (C)Max. 0.35

Nickel (Ni)Max. 0.5

Iron (Fe)Max. 0.75

Silicon (Si)Max. 1.0

Manganese (Mn)Max. 1.0

Manganese (Mn),Tungsten (W),Nitrogen (N),Phosphorus (P),Sulfur (S),Aluminum (Al),Titanium (Ti)M,Boron (B): Min

Medical and Biomedical: Orthopedic implants: hip and knee replacements, bone plates, screws, dental implants, crowns, and bridges, surgical instruments and tools, cardiovascular devices: heart valves, stents

Aerospace: High-strength, corrosion-resistant components, Gas turbine parts and blades

Chemical Processing: Valves, pumps, and fittings exposed to corrosive fluids, heat exchangers and reactor components

Industrial Manufacturing: Cutting and wear-resistant tools, extrusion dies and forming tools, bearings and bushings for harsh environments

Energy Sector: Components in power generation equipment requiring high wear resistance, turbine discs, seals, and erosion shield

Marine Industry: Pump components and valves, marine hardware and fasteners exposed to seawater, wear-resistant parts in underwater turbines and offshore equipment

MP35N

Features:

Ultra-high tensile strength combined with excellent ductility and toughness
Exceptional corrosion resistance to chlorides, mineral acids, hydrogen sulfide, and seawater
Superior resistance to stress corrosion cracking and hydrogen embrittlement
Nonmagnetic alloy suitable for medical, aerospace, and industrial applications

Applications:
Medical implants including bone plates, screws, and orthodontic devices, springs and fasteners requiring high strength and corrosion resistance, marine components exposed to harsh seawater environments, oil and gas downhole tools and pump shafts

Heat Treatment:

Solution Annealing: Heat to 1900–1950°F (1038–1066°C) for 1 to 4 hours followed by air cooling to produce a soft, ductile structure suitable for forming and machining.
Aging Treatment: After cold working, age at 1000–1200°F (538–649°C) for about 4 hours with air cooling to enhance strength by precipitating strengthening phases; aging alone without prior cold work does not increase strength.

MP35N is an age-hardenable nickel-cobalt-chromium-molybdenum superalloy known for its exceptional combination of ultra-high strength, toughness, ductility, and outstanding corrosion resistance. It withstands harsh environments including hydrogen sulfide, seawater, and chloride solutions, making it highly resistant to crevice and stress corrosion cracking. MP35N’s strength is developed through a combination of cold working and aging heat treatments, allowing it to achieve yield strengths exceeding 260 ksi (1793 MPa) while maintaining excellent ductility. Its superior corrosion resistance and mechanical properties make it ideal for critical applications in medical implants, aerospace components, oil and gas equipment, and marine hardware. Manufactured using advanced melting processes such as vacuum induction melting and vacuum arc remelting, MP35N offers a clean microstructure free from harmful inclusions,

Nickel (Ni): 33.0 – 37.0%

Chromium (Cr): 19.0 – 21.0%

Molybdenum (Mo): 9.0 – 10.5%

Cobalt: 33- 37%

Titanium (Ti)≤1.0%

Iron (Fe)≤1.0%

Manganese (Mn)≤0.15%

Silicon (Si)≤0.15%

Carbon (C),Phosphorus (P),Sulfur (S),Boron(B)

Medical and Biomedical: Orthopedic implants: hip and knee replacements, bone plates, screws, dental implants, crowns, bridges, surgical instruments and medical devices, cardiovascular devices such as heart valves and stents

Aerospace: High-strength, corrosion-resistant turbine components and blades, springs, fasteners, and specialty aerospace hardware

Oil and Gas: Downhole tools, pump shafts, and valves exposed to corrosive fluids, components requiring stress corrosion cracking resistance

Chemical Processing: Valves, pumps, mixers, and heat exchangers in aggressive environments, wear-resistant parts subject to erosion and corrosion

Marine: Corrosion-resistant pump components and valves, marine fasteners, fittings, and underwater turbine parts

Industrial Manufacturing: Cutting tools, extrusion dies, forming tools, and wear-resistant parts, springs and fasteners for high-stress applications

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