1.4109 / 440A / X70CrMo15 Martensitic Stainless Steel Sheet & Coil


AISI 440A ( UNS S44002 ) stainless is a high-carbon martensitic stainless steel developed to provide

stainless properties with maximum hardness.

It is magnetic in both the annealed and hardened conditions.

Maximum hardness and corrosion resistance are available only in the hardened or hardened and stress

relieved conditions, so the alloy is not used in the annealed or annealed and tempered conditions.

Dental and surgical instruments and cutlery are frequent applications for Type 440A.



Type 440A Stainless Steel in coils and cut lengths in thicknesses 0.1mm up and widths up to and including 250mm.

440A stainless High-carbon chromium steel. Provides stainless properties with excellent hardness.

Attains a hardness of Rockwell C 56 and maximum toughness when heat-treated.

Specifications: ASTM A276, ASTM A314, ASTM A473, ASTM A580, ASTM F899, AMS 5631, QQ-S-763



Grade C Si Mn Cr Mo
440A 0.60~0.75 1.00 max 1.00 max 16.00~18.00 0.75 max
440B 0.75~0.95 1.00 max 1.00 max 16.00~18.00 0.75 max
440C 0.95~1.20 1.00 max 1.00 max 16.00~18.00 0.75 max


440A is a high carbon martensitic stainless steel, this alloy can be heat treated to extremely high hardnesses.

It has slightly less carbon than 440B and 440C giving it better machinability but less hardness.

The combination of good wear resistance and high hardness makes this alloy an excellent candidate for cutting tools and knife blades.

It also is often used for dental and surgical equipment.