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Forging Materials

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4340

(UNS G43400) Low alloy nickel-chromium-molybdenum steel with excellent hardenability. Quench and tempering heat treatments yield good combinations of strength and toughness.

Chemistry

Element C Mn P S Si Cr Ni Cu Mo
4340 0.38-0.43% 0.65-0.85% 0.025% max 0.025% max 0.15-0.35% 0.70-0.90% 1.65-2.00% 0.35% max 0.20-0.30%

Physical Constants

Density0.284 lbs/in3
Density7.84 g/cm3

Heating

Forging2250ºF-1950ºF
Annealing1300ºF slow cool / furnace cool
Tempering400ºF-1200ºF depending on desired strength
Normalizing1600ºF-1700ºF air cool
Austenize1475ºF-1575ºF quench in oil

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" X14" x 14"750 lbs.
Shafts12" Dia max 96" long2600 lbs.

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