instrument and implant grade metal alloys

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Stainless Steel 440C (1.4215) Medical Alloy

440C (1.4215) martensitic stainless steel is heat treatable to attain the highest levels of strength, hardness and wear resistance of all of the stainless steels. It has a higher carbon content than 440A and 440B giving it these characteristics, but at the expense of slightly reduced corrosion resistance. Typically used in applications such as bearings and rollers, its high hardness make it ideal for all types of surgical cutting instruments.


Medical instruments
Surgical instruments
Dental instruments
Cutting instruments

Typical Chemical Composition

C Si Mn P S Cr Mo Fe
Min 0.95 16.00 0.40
Max 1.20 1.00 1.00 0.04 0.03 18.00 0.75 Balance

Heat Treatment

Treatment : 1925 °F ± 25 (1052 °C ± 14), held at heat for 30 minutes ± 3, and quenched in oil.
Optional : Sub-zero cooling to -100 °F ± 20 (-73 °C ± 11), holding at that temperature for 2 hours ± 0.25, and warming in air to room temperature

Typical Mechanical Properties

Condition Tensile (Rm)
Yield (R0.2%)
Annealed 130 Max 255HB Max
Heat Treated 58 Min


EN X105CrMo17
AFNOR X105CrMo17
NF S94-090
UNS S44004
AMS 5630
AMS 5618 Vac Melt


Stainless Steel 440C (1.4215) Medical Alloy is available in wire and round bar from 0.90mm diameter up to 52.0mm 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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Metal Weight Calculator

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