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Due to the higher carbon content, AISI 440 B is a chromium steel with high hardness, wear resistance and good cutting ability. It is magnetic, stainless, contains molybdenum and vanadium. Its wear resistance and corrosion resistance make it particularly suitable for wear parts. Due to its mechanical properties, AISI 440 B is also known as knife steel.

SS 440 B is used for shaped and flat knives in the food industry, perforated discs and accessories for mincers and shaped knives for fish processing. It is also well suited for surgical cutting tools and active elements in plastics processing, as well as in the automotive sector.

AISI 440 B Special Steel

International identifiers

SAE 440B, AFNOR X89CrMoV18-1, SUS440B, UNS S44003, 1.4112

Chemical composition

AISI 440 B
C Si Mn P S Cr Mo Ni V
min. 0.85 bis bis 17.00 0.90 0.07
max. 0.95 1.00 1.00 19.00 1.30 0.12


The forging process can be carried out between 1100°C and 800°C. Slow cooling is then carried out in the furnace, in ash or in the air.


This material is unsuitable for welding. There is a risk of hardening cracks.

Corrosion resistance

AISI SS 440 B in the quenched and tempered condition is corrosion resistant to water and chemical products due to its high chromium content.

Heat treatment

Heat treatment results in high hardness and good corrosion resistance.

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Special steel from stock

From stock in US

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Karol Borycki
Phone: +1 409 2395919

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Popular steel:
aisi 4330 v, ss 17-4ph