SAE 4140 steel tube is a low alloy steel that contains chromium, molybdenum, and manganese.SAE 4140 steel tube can be used for a wide variety of applications where betterwear resistance andtoughness is needed over normal carbon steels.
The chemical composition of SAE 4140 steel tube
Element |
Content (%)
|
Iron, Fe
|
96.785 - 97.77
|
Chromium, Cr
|
0.80 - 1.10
|
Manganese, Mn
|
0.75 - 1.0
|
Carbon, C
|
0.380 - 0.430
|
Silicon, Si
|
0.15 - 0.30
|
Molybdenum, Mo
|
0.15 - 0.25
|
Sulfur, S
|
0.040
|
Phosphorous, P
|
0.035
|
Properties |
Metric
|
Imperial
|
Density
|
7.85 g/cm3
|
0.284 lb/in³
|
Melting point
|
1416°C
|
2580°F
|
Properties |
Metric
|
Imperial
|
Tensile strength
|
655 MPa
|
95000 psi
|
Yield strength
|
415 MPa
|
60200 psi
|
Bulk modulus (typical for steel)
|
140 GPa
|
20300 ksi
|
Shear modulus (typical for steel)
|
80 GPa
|
11600 ksi
|
Elastic modulus
|
190-210 GPa
|
27557-30458 ksi
|
Poisson's ratio
|
0.27-0.30
|
0.27-0.30
|
Elongation at break (in 50 mm)
|
25.70%
|
25.70%
|
Hardness, Brinell
|
197
|
197
|
Hardness, Knoop (converted from Brinell hardness)
|
219
|
219
|
Hardness, Rockwell B (converted from Brinell hardness)
|
92
|
92
|
Hardness, Rockwell C (converted from Brinell hardness. Value below normal HRC range, for comparison purposes only)
|
13
|
13
|
Hardness, Vickers (converted from Brinell hardness)
|
207
|
207
|
Machinability (based on AISI 1212 as 100 machinability)
|
65
|
65
|
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