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.
Chemistry
| 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
| Density | 0.282 lbs/in3 |
| Density | 7.80 g/cm3 |
Heating
| Forging | 2000-2100ºF |
| Solution Treat | 1900ºF soak for 30-60 min air or oil cool |
| Age Harden | 900-1150ºF |
Viking Forging Parameters
| Rings | 24" O.D. X 6" long | 500 lbs. |
| Sleeves | 16" O.D. X 12" long | 500 lbs. |
| Disks | 26" Dia. X 6.5" long | 500 lbs. |
| Round Bar | 12" Dia. X 96" long | 2600 lbs. |
| Square/Rectangular Bar | 12" square X 96" long | 2600 lbs. |
| Blocks | 14" X 14" X14" | 750 lbs. |
| Shafts | 12" Dia X 96" long | 2600 Lbs. |
