Dynamic Metals
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Metals > Alloy Steels > 300M

ALLOY STEEL
300M  
 
Description
300M is a low alloy, vacuum melted, steel of very high strength. Essentially it is a modified AISI 4340 steel with silicon, vanadium and slightly greater carbon and molybdenum content than 4340. 300M has a very good combination of strength (1900-2100 MPA after final heat treatment), toughness, fatigue strength and good ductility. 300M is a through hardening alloy.
 
 

Specific Gravity

7.83 g/cm3
 
 
 
Typical Applications

Related Specifications
Aircraft Landing Gear
Driveshafts
High Strength bolts
Gears


AMS 6257
AMS 6417
AMS 6419
BS S155
BMS 7-26
MTL 1201
MIL S 8844
 
 
Chemical Composition (Wt %)
 
 
C
Si
Mn
P
S
S+P
Cr
Mo
Ni
V
Min
0.39
1.5
0.6
-
-
-
0.7
0.3
1.65
0.05
Max
0.44
1.8
0.9
0.015
0.015
0.025
0.95
0.45
2
0.10
 
 
Typical Mechanical Properties after heat treatment
 
 
0.2% proof Stress
Tensile Strength
Elongation
Reduction of area
 
MPA
MPA
%
%
 
Min
Min
Max
Min
Min
Longitudinal
1550
1900
2100
8
30
Transverse
1550
1900
2100
5
20
 
 
Hardness after heat treatment
534 - 601 HB

52 - 55 HRC

 
 
* Every effort has been made to ensure that our technical specifications are accurate. However, technical specifications included within Dynamic Metals Ltd should be used as a guideline only and are subject to change without notice.

 

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