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17-4 VAR

(UNS S17400) 17-4 VAR is a Vacuum Arc Remelted (VAR) chromium-nickel-copper precipitation hardening martensitic stainless steel with high strength and moderate corrosion resistance. High strength is maintained to about 600ºF. 17-4 VAR is age hardened (precipitation hardened) between 900 and 1150ºF, with a wide range of mechanical properties depending on aging temperature.


Element C Mn Si Cr Ni Cu Cb
17-4 VAR 0.04% max 0.65% max 0.35% max 15.70% max 4.70% max 3.50% max 0.30% max

Physical Constants

Density0.282 lbs/in3
Density7.80 g/cm3


Solution Treat1900ºF soak for 30-60 min air or oil cool
Age Harden900-1150ºF

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 X 96" long2600 lbs.
Blocks14" X 14" X14"750 lbs.
Shafts12" Dia X 96" long2600 Lbs.

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