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17-4 / 17-4PH

(UNS S17400) 17-4 is a chromium-nickel-copper precipitation hardening martensitic stainless steel with high strength and moderate corrosion resistance. High strength is maintained to about 600ºF. 17-4 is age hardened (precipitation hardened) between 900 and 1150ºF with 900ºF age yielding the highest strength.


Element C Mn P S Si Cr Ni Co
17-4 / 17-4PH 0.04% max. 0.40% max. 0.020% max. 0.005% max. 0.50% max. 15.5% 4.5% 3.50

Physical Constants

Density0.280 lbs/in3
Density7.75 g/cm3


Forging2150-2200ºF soak 1hr before forging
Solution TreatHeat at 1900ºF +/-25 ºF then air cool
Age HardenCondition H900,H925, H1025, H1074, H1100, H11

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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