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(UNS S43100) A martensitic stainless steel designed to provide improved corrosion resistance and toughness in a quench-hardenable stainless steel. Has excellent impact strength at high hardness levels.


Element C Mn P S Si Cr Ni
431 0.20% max. 1.00% max. 0.04% max. 0.03% max. 1.00% max. 15.00-17.00% 1.25-2.50%

Physical Constants

Density0.280 lbs/in3
Density7.75 g/cm3


Annealing1200-1250ºF cool in air
Tempering700-1050ºF cool in air
Austenize1800-1950ºF then oil quench

Viking Forging Parameters

Sleeves24" O.D. X 8" long500 lbs.
Disks24" Dia. max500 lbs.
Round Bar9.5" Dia. X 96" long2000 lbs.
Square/Rectangular Bar9.5" Square max. X 96" long2000 lbs.
Blocks11.5" X 11.5" X 11.5"500 lbs.
Shafts9.5" Dia. max X 96" long2000 lbs.

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