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SAE-AISI 8740 Steel vs. AWS ERTi-7

SAE-AISI 8740 steel belongs to the iron alloys classification, while AWS ERTi-7 belongs to the titanium alloys. There are 28 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 8740 steel and the bottom bar is AWS ERTi-7.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
110
Elongation at Break, % 11 to 23
20
Fatigue Strength, MPa 270 to 350
190
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 73
40
Tensile Strength: Ultimate (UTS), MPa 580 to 670
340
Tensile Strength: Yield (Proof), MPa 380 to 570
280

Thermal Properties

Latent Heat of Fusion, J/g 250
420
Maximum Temperature: Mechanical, °C 410
320
Melting Completion (Liquidus), °C 1460
1670
Melting Onset (Solidus), °C 1420
1620
Specific Heat Capacity, J/kg-K 470
540
Thermal Conductivity, W/m-K 39
21
Thermal Expansion, µm/m-K 13
8.7

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
3.6
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
7.3

Otherwise Unclassified Properties

Density, g/cm3 7.8
4.5
Embodied Carbon, kg CO2/kg material 1.5
47
Embodied Energy, MJ/kg 20
800
Embodied Water, L/kg 50
470

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 71 to 120
64
Resilience: Unit (Modulus of Resilience), kJ/m3 390 to 850
360
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
35
Strength to Weight: Axial, points 20 to 24
21
Strength to Weight: Bending, points 20 to 22
24
Thermal Diffusivity, mm2/s 10
8.8
Thermal Shock Resistance, points 17 to 20
26

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.030
Chromium (Cr), % 0.4 to 0.6
0
Hydrogen (H), % 0
0 to 0.0080
Iron (Fe), % 96.5 to 97.7
0 to 0.12
Manganese (Mn), % 0.75 to 1.0
0
Molybdenum (Mo), % 0.2 to 0.3
0
Nickel (Ni), % 0.4 to 0.7
0
Nitrogen (N), % 0
0 to 0.015
Oxygen (O), % 0
0.080 to 0.16
Palladium (Pd), % 0
0.12 to 0.25
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0.15 to 0.35
0
Sulfur (S), % 0 to 0.040
0
Titanium (Ti), % 0
99.417 to 99.8