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Forging Materials

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(UNS K44220) Modified 4340 steel with added silicon allowing for use of a higher tempering temperature. Has high hardnenability and strength with good ductility and toughness in heavy sections. Used in the 270,000 psi to 300,000 psi tensile strength range.


Element C Mn Si Cr Ni Mo
300M 0.42% 0.75% 1.65% 0.80% 1.80% 0.40%

Physical Constants

Density0.283 lb/in^3
Density7.84 g/cm^3


Forging1950ºF-2150ºF 1700ºF minimum
Annealing1300ºF slow cool / furnace cool
Tempering500ºF-600ºF 4 hours then air cool
Normalizing1700ºF one hour then air cool
Austenize1600ºF one hour then oil quench

Viking Forging Parameters

Rings24" O.D. X 6" long500 lbs.
Sleeves16" O.D. X 12" long500 lbs.
Disks26" O.D. X 6.5" long500 lbs.
Round Bar12" Dia. X 96" long2600 lbs.
Square/Rectangular Bar12" Square X 96" long2600 lbs.
Blocks14" X 14" X 14"750 lbs.
Shafts12" Dia max. X 96" long2600 lbs.

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