300M
(UNS K44220) Modified 4340 steel with added silicon allowing for use of a higher tempering temperature. Has high hardnenability and strength with good ductility and toughness in heavy sections. Used in the 270,000 psi to 300,000 psi tensile strength range.
Chemistry
| Element |
C |
Mn |
Si |
Cr |
Ni |
Mo |
| 300M |
0.42% |
0.75% |
1.65% |
0.80% |
1.80% |
0.40% |
Physical Constants
| Density | 0.283 lb/in^3 |
| Density | 7.84 g/cm^3 |
Heating
| Forging | 1950ºF-2150ºF 1700ºF minimum |
| Annealing | 1300ºF slow cool / furnace cool |
| Tempering | 500ºF-600ºF 4 hours then air cool |
| Normalizing | 1700ºF one hour then air cool |
| Austenize | 1600ºF one hour then oil quench |
Viking Forging Parameters
| Rings | 24" O.D. X 6" long | 500 lbs. |
| Sleeves | 16" O.D. X 12" long | 500 lbs. |
| Disks | 26" O.D. 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" X 14" | 750 lbs. |
| Shafts | 12" Dia max. X 96" long | 2600 lbs. |
