Name: Cobalt COCRMO-F75
Brand: Cobalt Alloys

Material Overview

Cobalt COCRMO-F75 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

Cobalt CoCrMo-F75 is a cast cobalt-chromium-molybdenum alloy specified for surgical implant castings and implant-grade casting feedstock. Its high chromium content supports corrosion resistance and passivation, while molybdenum contributes to strength, wear resistance and microstructural stability. Typical applications include orthopedic joint components, dental prosthetic castings, precision medical parts, wear-resistant components and selected high-temperature engineering castings. ASTM F75 material is normally supplied as investment castings or as shot, bar and ingot for approved casting production.

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 COCRMO-F75 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	ASTM F75 Typical Requirement, wt.%	Role in CoCrMo-F75
Cobalt	Co	Balance	Forms the corrosion-resistant cobalt-base matrix.
Chromium	Cr	27.0-30.0	Forms a stable passive oxide film and improves corrosion and wear resistance.
Molybdenum	Mo	5.0-7.0	Improves solid-solution strengthening, wear resistance and localized corrosion resistance.
Nickel	Ni	0.50 max	Restricted residual element for implant-grade chemistry control.
Iron	Fe	0.75 max	Controlled residual element.
Carbon	C	0.35 max	Promotes carbide formation and contributes to cast strength and wear resistance.
Manganese	Mn	1.0 max	Controlled minor alloying element.
Silicon	Si	1.0 max	Controlled processing and residual element.
Nitrogen	N	0.25 max	Controlled interstitial element affecting strength and castability.
Tungsten	W	0.20 max	Restricted residual element.
Phosphorus	P	0.02 max	Restricted impurity for casting quality.
Sulfur	S	0.01 max	Restricted impurity for melt cleanliness and ductility.
Aluminum	Al	0.10 max	Controlled residual element.
Titanium	Ti	0.10 max	Controlled residual element.
Boron	B	0.01 max	Restricted microalloying and residual 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 8.3 g/cm3	Approximately 0.300 lb/in3	Cast alloy, representative value
Melting Range	Approximately 1350-1430 °C	Approximately 2462-2606 °F	Composition and melting practice dependent
Elastic Modulus	Approximately 210-230 GPa	Approximately 30.5-33.4 x 10³ ksi	Representative CoCrMo cast-alloy range
Mean Coefficient of Thermal Expansion	Approximately 14-15 µm/m·°C	Approximately 7.8-8.3 µin/in·°F	Near room temperature; condition dependent
Thermal Conductivity	Approximately 12-16 W/m·°C	Approximately 7-9 Btu·in/ft2·h·°F	Representative cast CoCrMo range
Specific Heat	Approximately 450-500 J/kg·°C	Approximately 0.107-0.119 Btu/lb·°F	Temperature dependent
Electrical Resistivity	Approximately 0.9-1.1 µΩ·m	Approximately 90-110 µΩ·cm	Representative room-temperature range
Magnetic Behavior	Generally low magnetic response	Permeability depends on microstructure and test field	Verify for instruments or magnetic-sensitive assemblies

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.

Material / Test Condition	Tensile Strength	Yield Strength, 0.2%	Elongation	Reduction of Area
ASTM F75 product castings, minimum	655 MPa	450 MPa	8% min	8% min
ASTM F75 casting alloy, minimum	665 MPa	450 MPa	8% min	8% min
Typical investment-cast condition	Approximately 655-800 MPa	Approximately 450-600 MPa	Approximately 8-20%	Approximately 8-20%
Heat-treated or HIP-assisted casting, typical	Approximately 700-950 MPa	Approximately 500-700 MPa	Approximately 10-25%	Condition dependent
Hardness, representative	Approximately 30-40 HRC		Not a substitute for ASTM F75 tensile acceptance
ASTM F75 and ISO 5832-4 values are acceptance requirements for specified test specimens. Finished implant properties may differ because of geometry, casting integrity, heat treatment, HIP and machining.

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 COCRMO-F75 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
Cast Surgical Implant Components	ASTM F75-23	Cobalt-28 chromium-6 molybdenum unfinished investment product castings for surgical implants	Confirm the current revision, casting class, chemistry and mechanical acceptance requirements.
Cast Surgical Implant Components	ISO 5832-4:2024	Cobalt-chromium-molybdenum casting alloy for surgical implant manufacture	ISO mechanical values are based on specified test samples and may not equal finished-product properties.
Casting Alloy Feedstock	ASTM F75-23	Shot, bar or ingot used to produce approved implant castings	Feedstock certification does not by itself certify a completed implant casting.
Medical Powder	ASTM F1377	Cobalt-28 chromium-6 molybdenum powder for medical-device applications	Use only when the purchase is specifically for qualified powder processing.
Powder-Bed-Fusion Parts	ASTM F3213	Manufacturing and finished-part requirements for CoCrMo powder-bed-fusion products	Do not treat additively manufactured parts as ASTM F75 investment castings without qualification.
Wrought CoCrMo Alloy	ASTM F1537	Wrought cobalt-28 chromium-6 molybdenum alloy for surgical implants	This is a different product route and should not be substituted for F75 cast material.
Finished Medical Device	Project-specific medical-device requirements	Surface finish, cleanliness, dimensional control, sterilization and biological evaluation	ASTM F75 does not certify the complete finished medical device or clinical suitability.
Non-Destructive Examination	ASTM F75 referenced inspection methods	Liquid penetrant, radiographic, metallographic and hardness examinations for product castings	Inspection extent and acceptance criteria must be agreed before casting production.

Available Product Forms

Cobalt COCRMO-F75 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 cast, machined or project-specific tubular components	As-cast, HIP-assisted or heat treated according to drawing	Special medical housings, wear sleeves and research components	View Pipe & Tube
Round Bar	Cast feedstock bar and machining stock in custom diameters	Clean cast, inspected and supplied for approved implant casting	Medical casting feedstock, test coupons and machined prototypes	View Round Bar
Sheet & Plate	Drawing-based cast plates and prototype blanks	As-cast or machined; not equivalent to ASTM F1537 wrought sheet	Medical prototypes, wear plates and custom research parts	View Sheet & Plate
Strip & Foil	Custom cast or processed strip for research and special components	Project-specific, with chemistry and surface inspection	Small precision parts and laboratory development work	View Strip & Foil
Wire	Custom wire or additive-manufacturing feedstock when qualified	Clean, controlled chemistry and diameter to project specification	Medical prototyping, repair development and special deposition work	View Wire
Fasteners	Custom bolts, screws, studs and fixation components	Machined from qualified CoCrMo stock; drawing-based supply	Medical instruments, implants and wear-resistant assemblies	View Fasteners
Fittings	Custom cast or machined fittings to drawing	Surface finished, inspected and documented for the intended application	Medical equipment and specialized fluid-handling assemblies	View Fittings
Flanges	Custom rings and flange-like cast components	As-cast or machined, with project-specific inspection	Research equipment, medical tooling and high-wear connections	View Flanges
Forgings	Drawing-based rings, discs and custom wrought alternatives	Specify ASTM F1537 if a wrought implant alloy is required	Medical components requiring refined wrought microstructure	View Forgings
Welding Wire	Custom CoCrMo wire for qualified repair or development procedures	Controlled chemistry and cleanliness; not automatically ASTM F75 certified	Repair trials, research welds and special fabrication	View Welding Wire

Material Selection Guide

When to consider Cobalt COCRMO-F75

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.

Material / Process	Selection Strength	Typical Position	Selection Note
CoCrMo-F75 cast alloy	Established cast implant alloy with high corrosion and wear resistance	Investment-cast orthopedic and dental components	Select when an ASTM F75 or ISO 5832-4 cast implant specification is required.
CoCrMo wrought alloy, ASTM F1537	Refined wrought microstructure and generally higher ductility	Bar, plate, wire and machined implant components	Choose when the design requires wrought material rather than investment casting.
Titanium Alloy Ti-6Al-4V, ASTM F136	Lower density and lower elastic modulus	Load-bearing orthopedic implants where weight and modulus are critical	Compare wear pairing, stiffness, fatigue, surface treatment and biological requirements.
316L Stainless Steel, ASTM F138	Lower cost and good general implant fabrication response	Temporary implants, instruments and selected fixation devices	CoCrMo-F75 is usually preferred for higher wear and corrosion demands.
Ceramic Alumina or Zirconia	Very high hardness and low wear in selected articulating pairs	Joint bearing surfaces and dental applications	Compare brittleness, fracture toughness, mating materials and impact risk.
CoCrMo additive-manufactured alloy	Complex geometry and material-efficiency advantages	Qualified medical AM components	Use ASTM F1377 or ASTM F3213 and process-specific qualification rather than assuming ASTM F75 equivalence.

Why Choose Us

Supply and quality support for Cobalt COCRMO-F75

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.

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FAQ

Cobalt COCRMO-F75 questions from buyers

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

CoCrMo-F75 is mainly used for investment-cast orthopedic implants, dental prosthetic castings, joint components, wear-resistant medical parts and approved implant-grade casting feedstock.

Yes. UNS R30075 is the standardized designation for the cast cobalt-28 chromium-6 molybdenum alloy covered by ASTM F75. The alloy is also commonly described as cast CoCrMo or Co-28Cr-6Mo.

ASTM F75 covers cast cobalt-chromium-molybdenum alloy and unfinished investment product castings for surgical implants. ASTM F1537 covers wrought cobalt-chromium-molybdenum products. They have different manufacturing routes, microstructures, dimensions and mechanical requirements.

Typical ASTM F75 minimum requirements include approximately 655 MPa tensile strength, 450 MPa 0.2% yield strength, 8% elongation and 8% reduction of area for product castings. The exact acceptance values and specimen requirements must be checked against the current ASTM F75 revision.

CoCrMo-F75 is fundamentally a cast alloy, and ASTM F75 acceptance depends on the specified casting condition. Homogenization, solution treatment, stress relief or HIP may be used for a particular casting route, but the cycle must be qualified for the alloy, geometry and medical application rather than assumed from wrought CoCrMo practice.

We can quote ASTM F75 investment castings and casting feedstock such as shot, bar and ingot. Plate, sheet, strip, wire, tube, fittings, flanges and fasteners can be discussed as custom, machined or project-specific products, but they should not be represented as ordinary ASTM F75 wrought stock.

ASTM F75-23 is the primary U.S. specification for cast CoCrMo implant alloy, while ISO 5832-4:2024 covers cobalt-chromium-molybdenum casting alloy for surgical implants. ASTM F1537 applies to wrought CoCrMo, ASTM F1377 to medical CoCrMo powder and ASTM F3213 to qualified powder-bed-fusion parts.

Please send the ASTM or ISO standard, casting type, component drawing, dimensions, quantity, alloy feedstock form, surface finish, HIP or heat-treatment requirements, radiographic and penetrant inspection requirements, mechanical test plan, cleanliness requirements and intended medical-device application.

Cobalt COCRMO-F75