instrument and implant grade metal alloys

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BiodurĀ® 108 (X4CrNiMoN23-21-1) Medical Alloy

Biodur® 108 is a nickel-free austenitic stainless steel which exhibits good toughness and mechanical properties, fatigue properties and corrosion resistance superior to those of Stainless Steel 316L.

Substituting the Nickel content for Manganese allows it to maintain its fully austenitic microstructure in all conditions, the Pressure-ESR remelting process ensures a fine and clean microstructure. This steel is free of all delta-ferrite and is non-magnetic, satisfying the requirements for ASTM F138.


Bone surgery implants
Joint replacement prostheses and implants
Medical, surgical and dental instruments

Typical Chemical Composition

C Si Mn P S Cr Mo Ni Cu N Fe
Min 21.00 19.00 0.50
Max 0.08 0.75 24.00 0.030 0.010 23.00 1.50 0.10 0.25 0.25 Balance

Typical Mechanical Properties

Form Tensile (Rm)
Yield (R0.2%)
A4d (%)
Bars - Annealed 970 600 ≤48
Wire - cold drawn 970-2200 600-1800 38


UNS S29108
ASTM F2229 (Implant Quality)


Biodur® 108 is available in precision ground round bar from 1.0mm diameter up to 60.0mm diameter

Disclaimer : Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.

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NOTE: Weights calculated are theoretical. Manufacturing tolerances should be allowed for and results adjusted accordingly.