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F11 Class 1

Grade F11 Class 1,2 & 3 1.25% chromium, 0.5% molybdenum, Low Alloy Steel 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 Mo
F11 Class 1 0.050-0.15% 0.30-0.80% 0.030% max 0.030% max 0.50-1.00% 1.00-1.50% 0.44-0.65%

Physical Constants

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


Annealing1650ºF furnace cool
Normalizing1650ºF 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
Shafts12" Dia. max X 96" long2600 lbs.

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