440C
(UNS S44000) A martensitic, high-carbon chromium stainless steel. Typically used as a bearing steel. Can attain hardness of 60HRc when heat treated.
Chemistry
| Element |
C |
Mn |
P |
S |
Si |
Cr |
Mo |
| 440C |
0.95-1.20% |
1.00% |
0.04% |
0.03% |
1.00% |
16.00-18.00% |
0.75% |
Physical Constants
| Density | 0.275 lbs/in3 |
| Density | 7.62 g/cm3 |
Heating
| Forging | 1900-2100ºF Finish above 1700ºF |
| Annealing | 1550-1600ºF furnace cool |
| Tempering | 300-350ºF 1 hr minimum |
| Austenize | 1850-1900ºF oil or air quench |
Viking Forging Parameters
| Rings | 24" O.D. X 8" long | 500 lbs. |
| Sleeves | 24" O.D. max | 500 lbs. |
| Disks | 24" Dia. X 4" long | 500 lbs. |
| Round Bar | 9.5" Dia. X 96" long | 2000 lbs. |
| Square/Rectangular Bar | 9.5" Square max. X 96" long | 2000 lbs. |
| Blocks | 11.5" X 11.5" X 11.5" | 500 lbs. |
| Shafts | 9.5" Dia. max. X 96" long | 2000 lbs. |
