Cobalt Chrome Molybdenum Bar Stock - Chrome Moly Steel - ASTM F1537 Alloy 1

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We are suppliers of Cobalt Chrome Molybdenum (ASTM F1537 Alloy 1) in round bar stock, sometimes known as chrome moly steel.  This is a cobalt-chromium-molybdenum (Co-Cr-Mo) alloy used for machining and forging stock, especially in the medical implant industry.  The molybdenum improves strength and heat resistance, while the chromium provides oxidation and corrosion resistance.  This material is highly biocompatible, making it ideal for surgical implants such as knee, hip, and shoulder replacements.  Our medical grade CCM steel bar is domestically melted and produced by a leading global US manufacturer and is universally accepted by all major medical OEMs. 

Cobalt Chrome Moly Inventory Size Ranges


0.250" - 1.250"

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Working with Cobalt Chrome Molybdenum (CCM)

This low alloy steel features high strength, hardness, toughness, and creep-resistance that also makes it difficult to machine when compared to mild carbon steels.  Tools can wear rapidly with this product, and work hardening should be minimized with sharp tools and low vibration machines and mounts.  Difficulty in machining is comparable to titanium alloyed steel.  We can supply custom precision ground sizes and tolerances upon demand.

Cobalt Chrome Moly Supply Chain Solutions

  • Get same or next day shipment from stock; mill quantities to blanket orders
  • FIRSTCUT+® Processing Services
  • Comprehensive inventory management
  • All material is melt-source traceable


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Standard Inventory Specifications

  • ASTM F1537
  • ASTM F1537 Alloy #1
  • UNS R31537

Common Trade Names

  • BioDur® Carpenter CCM® Alloy
  • CarTech® BioDur® CCM® Alloy

Common Applications of Cobalt Chrome Moly

Our CoCrMo bar stock (F1537 Alloy 1) is primarily used in the medical manufacturing industry, where its high fatigue life is appropriate for repeated movements found in joints like knees and hips.  Biocompatibility is similar to titanium, with greater mechanical strength for load bearing applications. 

  • Acetabular Cups
  • Knee replacements
  • Hip replacement implants
  • Shoulder replacement implants
  • Spinal rods, cages and disc replacement
  • Fracture fixation

Our medical grade CCM round bar is domestically melted and produced by a leading global US manufacturer and is universally accepted by all major medical OEMs.

Chemical Composition of Cobalt Chrome Moly
Element Percent by Weight
Co Cobalt 66.00 max
Cr Chromium 27 max
Ni Nickel 0.2 max
Mo Molybdenum 5.5 max
C Carbon 0.04 max
- Other -

Physical Properties of Cobalt Chrome Moly

Physical Properties


0.2990 lb/in?

Poisson?s Ratio


Modules of Elasticity

(E) 35.0 x 10³ ksi  

Modules of Rigidity

(G) 13.4 x 10³ ksi

Specific Gravity


Mechanical Properties of Cobalt Chrome Moly


0.2% Yield Strength

Ultimate Tensile Strength

% Elongation in 4D

% Reduction of Area

HRC Hardness


85 ksi

585 MPa

150 ksi

1035 MPa




Warm Worked

135 ksi

930 MPa

190 ksi

1310 MPa




Hot Worked

110 ksi

760 MPa

160 ksi

1100 MPa




United Performance Metals is Approved ISO 13485 : 2016 

*The technical data provided is for information only and not for design purposes.  It is not warranted or guaranteed.