F91
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.
Chemistry
| 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
| Density | 0.285 lbs/in3 |
| Density | 7.89 g/cm3 |
Heating
| Tempering | 1350-1470ºF |
| Normalizing | 1900-1975ºF air cool |
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 max X 96" long | 2600 lbs. |
| Blocks | 14" X 14" X 14" | 750 lbs. |
| Shafts | 26" Dia. max X 96" long | 2600 lbs. |
