Stainless Steel 440A

Technical Data Sheet

Alloy 440A is a high carbon and chromium martensitic stainless steel. Alloy 440A provides properties of stainless steel together with excellent hardness and moderate corrosion resistance. Alloy 440A is used in dental and surgical instruments, cutlery, pivot pins, valve parts. 

Chemical Composition Limits
Weight% C P Si Mo Mn S Cr Fe Ni Cu
Alloy 440A
0.60-0.75 0.040 1.0 0.75 1.0 0.030 16-18 Bal 0.75 0.50

Typical Mechanical Properties


Material Condition
Yield Strength 0.2% (MPa) Ultimate Tensile Strength (MPa) Elongation 2"% Reduction of Area Brinell Hardness
Alloy 440A Hardened 1900°F, oil quench, tempered 600°F 1655 1793 5 20 512

Alloy 440A is available as Bar (Round, Flat), Wire, Rod, Strip, Billet, Forgings. For all stock availability contact Sales.

AMS 5631 Bars / wire / forgings
AMS 5632 440F Bars / forging
ASTM A276 / ASME SA276
ASTM A473 / ASME SA473
ASTM A314 / ASME SA314
ASTM A484 / ASME SA484
ASTM A580 / ASME SA580
UNS S44002

For more information about Alloy 440a for use in medical applications, visit our medical division at

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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.