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SAE-AISI 4340 Steel vs. Titanium 6-7

SAE-AISI 4340 steel belongs to the iron alloys classification, while titanium 6-7 belongs to the titanium alloys. There are 26 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4340 steel and the bottom bar is titanium 6-7.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
120
Elongation at Break, % 12 to 22
11
Fatigue Strength, MPa 330 to 740
530
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 73
45
Shear Strength, MPa 430 to 770
610
Tensile Strength: Ultimate (UTS), MPa 690 to 1280
1020
Tensile Strength: Yield (Proof), MPa 470 to 1150
900

Thermal Properties

Latent Heat of Fusion, J/g 250
410
Maximum Temperature: Mechanical, °C 430
300
Melting Completion (Liquidus), °C 1460
1700
Melting Onset (Solidus), °C 1420
1650
Specific Heat Capacity, J/kg-K 470
520
Thermal Expansion, µm/m-K 13
9.3

Otherwise Unclassified Properties

Base Metal Price, % relative 3.5
75
Density, g/cm3 7.8
5.1
Embodied Carbon, kg CO2/kg material 1.7
34
Embodied Energy, MJ/kg 22
540
Embodied Water, L/kg 53
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 79 to 170
110
Resilience: Unit (Modulus of Resilience), kJ/m3 590 to 3490
3460
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
32
Strength to Weight: Axial, points 24 to 45
56
Strength to Weight: Bending, points 22 to 33
44
Thermal Shock Resistance, points 20 to 38
66

Alloy Composition

Aluminum (Al), % 0
5.5 to 6.5
Carbon (C), % 0.38 to 0.43
0 to 0.080
Chromium (Cr), % 0.7 to 0.9
0
Hydrogen (H), % 0
0 to 0.0090
Iron (Fe), % 95.1 to 96.3
0 to 0.25
Manganese (Mn), % 0.6 to 0.8
0
Molybdenum (Mo), % 0.2 to 0.3
6.5 to 7.5
Nickel (Ni), % 1.7 to 2.0
0
Niobium (Nb), % 0
6.5 to 7.5
Nitrogen (N), % 0
0 to 0.050
Oxygen (O), % 0
0 to 0.2
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0.15 to 0.35
0
Sulfur (S), % 0 to 0.040
0
Tantalum (Ta), % 0
0 to 0.5
Titanium (Ti), % 0
84.9 to 88