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. |