One of the unique attributes of A2 is that it's optimal edge holding ability and toughness are attained at roughly the same HRC of 60 so you get a 2'fer without compromising one for the other (no need for differential heat treat in an attempt to create a long wearing edge with a softer spine for toughness).

A2 is only slightly more rust resistant than O1 but has a tendency to pit where as O1 will stain across the surface when neglected. By comparison, A2 has about half the chromium of D2. As Geedub mentioned, etching/patina/bluing etc will help with potential rust issues.


Here is some industry data on A2 compared to other steels. For clarification "AIRKOOL" is the a trade name for A2 tool steel.
https://www.hudsontoolsteel.com/technical-data/steelA2Knife

Mechanical Properties

Heat Treatment Austenitizing

Temp. HRC Impact Toughness ft.-lb. (J) Wear Resistance Adhensive


AIRKOOL 1750°F(955C) 60 40 (53) 2-3

S7 1750°F(955C) 57 125 (165) 1

D2 1850°F(1065C) 60 21 (28) 3-4

Cru-Wear 1950°F(1065C) 62 30 (40) 5-6

3V 1950°F(1065C) 60 70 (95) 7

M2 2050°F(1120C) 62 20 (27) 8-10

M4 2050°F(1120C) 62 32 (43) 20-25

10V 2150°F(1175C) 63 14 (19) 90






Last edited by SBTCO; 02/22/21.
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