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Forging Materials

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(UNS G41400) Aircraft Quality Medium carbon alloy steel with high hardenability, good fatigue strength and impact resistance.


Element C Mn P S Si Cr Mo
4140AQ 0.38-0.43% 0.75-1.0% 0.035% max 0.040% max 0.15-0.30% 0.80-1.10% 0.15-0.25%

Physical Constants

Density0.283 lbs/in3
Density7.83 g/cm3


Annealing1500ºF slow cool / furnace cool
Austenize1500ºF-1600ºF then oil quench

Viking Forging Parameters

Rings24" O.D. X 6" long500 lbs.
Sleeves16" O.D. X 12" long500 lbs.
Disks26" Dia. X 6.5" long500 lbs.
Round Bar12" Dia. X 96" long2600 lbs.
Square/Rectangular Bar12" square X 96" long2600 lbs.
Blocks14" X14" X 14"750 lbs.
Shafts12" Dia. max X 96" long2600 lbs.

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