instrument and implant grade metal alloys

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Stainless Steel 420A (1.4021) Medical Alloy

420A is a martensitic stainless steel best used in the hardened, fine polished an passivated conditions in order to increase its toughness levels and make it ideal for generating a good cutting edge. It can be hardened by heat-treatment and also develops a good corrosion resistance to many chloride-free environments such as soaps, solvents and organic solutions.


Medical instruments
Surgical instruments
Dental instruments

Typical Chemical Composition

C Si Mn P S Cr Mo Fe
Min 0.16 12.00
Max 0.25 1.00 1.50 0.04 0.015 14.00 Balance

Typical Mechanical Properties

Condition Tensile (Rm)
Yield (R0.2%)
A4d (%)
Reduction of
Area %
Annealed <230 HB
Heat Treated 600-875 45


ISO 7153-1 (B)
EN X20Cr13
DIN X20Cr13


Stainless Steel 420A (1.4021) Medical Alloy is available in wire and round bar from 1.00mm diameter up to 27.00mm 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

Metal Alloy



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