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
Your Source for Exotic and Hard To Find Aerospace and Aircraft Metals.
Home.
About Us.
Inconel Tube.
Incone Pipe.
Inconel Sheet.
Inconel Plate.
Inconel Bar.
Inconel Fittings.
Alloy Steel Bar.
Alloy Steel Plate.
Foils.
Stainless Bar.
Stainless Plate.
Aluminum Sheet.
Aluminum Plate.
Aluminum Bar.
Aluminum Tube.
Titanium Bar.
Titanium Plate.
Titanium Sheet.
Export Department.
Services.
Quality Certs.
Contact Us.
Technical Data.
ISO 900:1:2000 and AS9120:2002 Certified
Contact Us Today With Material Requirement:
Pacific Alloys Corp.
 17800 South Main Street, Suite 204
 Gardena, California 90248
 Phone: (888) 445-3196, Fax: (310) 362-8674
 Cage Code: 4WM51
 Email: sales@pacificalloys.com
 Or Complete Our Online RFQ Form
Copyright Pacific Alloys Corp © 2008 All rights reserved.
Phone: (888) 445-3196, Fax: (310) 362-8674
Pacific Alloys Corp.
4340 Alloy Steel Properties