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Forging Materials

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(UNS K24065) A low alloy nitriding grade of steel with moderate hardenability. Was designed to provide a high case hardness and to maintain is core strength during the nitriding cycle.


Element C Mn Si Cr Mo Al
NITRALLOY 135 0.40% 0.60% 0.30% 1.60% 0.20% 1.20%

Physical Constants

Density0.284 lb/in3
Density7.83 g/cm3


Forging2000-2025ºF 1700ºF minimum
Annealing1700ºF and slow cool
Tempering1000-1300ºF depending on desired hardness
Normalizing1800ºF hold 1 to 4 hrs then air cool
Austenize1700-1750ºF then oil or water 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 max. X 96" long2600 lbs.
Blocks14" X 14" X 14"750 lbs.
Shafts12" Dia. max. X 96" long2600 lbs.

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