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Forging Materials

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UNS K90901 Grade F91 9%Chromium, 1% Molybdenum, 0.20% Vanadium plus Columbium and Nitrogen. ASTM-A182 Standard Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings and Valves and Parts for High Temperature Service. This specification covers forged low alloy and stainless steel piping components for use in pressure systems.


Element C Mn P S Si Cr Ni Mo Co N Al Ti
F91 0.08-0.12% 0.30-0.60% 0.020% max 0.010% max 0.20-0.50% 8.0-9.5% 0.40% max 0.85-1.05% 0.06-0.10 0.03-0.07% 0.02% max 0.01% max

Physical Constants

Density0.285 lbs/in3
Density7.89 g/cm3


Normalizing1900-1975ºF air cool

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.
Shafts26" Dia. max X 96" long2600 lbs.

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