4340 Chemical Composition:
C
Mn
Si
Cr
Ni
Mo
S
P
Co
Other
0.38-0.43
0.75
.30
0.80
1.80
0.25
0.025 Max
0.025 Max
__
4340 Alloy Steel Physical Properties
Density
.283lb./In³(7.84 gm/cm³) @ 20°C (68°F)
Typical Mechanical Properties of 4340 Alloy Steel
Tempering Temperature
Tensile Strength
Yield Strength
Elongation in 2in %
Reduction in area %
Hardness
Izod impact energy
°C
°F
MPa
ksi
MPa
Ksi
HB
HRC
J
Ft • lbf
205
400
1980
287
1860
270
11
39
520
53
20
15
315
600
1760
255
1620
235
12
44
490
49.5
14
10
425
800
1500
217
1365
198
14
48
440
46
16
12
540
1000
1240
180
1160
168
17
53
360
39
47
35
650
1200
1020
148
860
125
20
60
290
31
100
74
705
1300
860
125
740
108
23
63
250
24
102
75
Oil quenched from 845°C (1550°F) and tempered at various temperatures
High Temperature, Aerospace , Aircraft,  and Industrial  Metals
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4340 Alloy Steel Properties