300m Alloy Steel

Typical Applications

Aircraft Landing Gear

Driveshafts

High Strength bolts

Gears

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 alloy steel (AMS 6257, AMS 6417, AMS 6419) 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.

Related Products

Technical specification

Related Specifications

AMS 6257
AMS 6417
AMS 6419
BS S155
BMS 7-26
MTL 1201
MIL S 8844

Specific Gravity

7.83 g/cm3

Chemical Composition (WT %)

 
Min  
Max  
C  
0.39  
0.44  
Si  
1.5  
1.8  
Mn  
0.6  
0.9  
P  
-  
0.015  
S  
-  
0.015  
S+P  
-  
0.025  
Cr  
0.7  
0.95  
Mo  
0.3  
0.45  
Ni  
1.65  
2  
V  
0.05  
0.10  

Typical Mechanical Properties

 
-  
-  
Longitudinal
Transverse
0.2% Proof Stress  
MPA  
Min  
1550
1550
Tensile Strength  
MPA  
Min  
1900
1900
Tensile Strength  
MPA  
Max  
2100
2100
Elongation  
%  
Min  
8
5
Reduction of area  
%  
Min  
30
20

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