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SAE-AISI 8660 Steel vs. Grade 6 Titanium

SAE-AISI 8660 steel belongs to the iron alloys classification, while grade 6 titanium belongs to the titanium alloys. There are 30 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 8660 steel and the bottom bar is grade 6 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
100
Elongation at Break, % 12
11
Fatigue Strength, MPa 340
290
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 73
39
Shear Strength, MPa 390
530
Tensile Strength: Ultimate (UTS), MPa 660
890
Tensile Strength: Yield (Proof), MPa 550
840

Thermal Properties

Latent Heat of Fusion, J/g 250
410
Maximum Temperature: Mechanical, °C 410
310
Melting Completion (Liquidus), °C 1450
1580
Melting Onset (Solidus), °C 1410
1530
Specific Heat Capacity, J/kg-K 470
550
Thermal Conductivity, W/m-K 39
7.8
Thermal Expansion, µm/m-K 13
9.4

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
1.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
36
Density, g/cm3 7.8
4.5
Embodied Carbon, kg CO2/kg material 1.5
30
Embodied Energy, MJ/kg 20
480
Embodied Water, L/kg 50
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 73
92
Resilience: Unit (Modulus of Resilience), kJ/m3 800
3390
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
35
Strength to Weight: Axial, points 23
55
Strength to Weight: Bending, points 21
46
Thermal Diffusivity, mm2/s 10
3.2
Thermal Shock Resistance, points 19
65

Alloy Composition

Aluminum (Al), % 0
4.0 to 6.0
Carbon (C), % 0.56 to 0.64
0 to 0.080
Chromium (Cr), % 0.4 to 0.6
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 96.4 to 97.6
0 to 0.5
Manganese (Mn), % 0.75 to 1.0
0
Molybdenum (Mo), % 0.15 to 0.25
0
Nickel (Ni), % 0.4 to 0.7
0
Nitrogen (N), % 0
0 to 0.030
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
Tin (Sn), % 0
2.0 to 3.0
Titanium (Ti), % 0
89.8 to 94
Residuals, % 0
0 to 0.4