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ASTM B817 Type II vs. SAE-AISI 8115 Steel

ASTM B817 type II belongs to the titanium alloys classification, while SAE-AISI 8115 steel belongs to the iron alloys. There are 25 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is ASTM B817 type II and the bottom bar is SAE-AISI 8115 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 100
190
Elongation at Break, % 3.0 to 13
15
Fatigue Strength, MPa 390 to 530
320
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 40
73
Tensile Strength: Ultimate (UTS), MPa 900 to 960
610
Tensile Strength: Yield (Proof), MPa 780 to 900
500

Thermal Properties

Latent Heat of Fusion, J/g 400
250
Maximum Temperature: Mechanical, °C 350
410
Melting Completion (Liquidus), °C 1580
1460
Melting Onset (Solidus), °C 1530
1420
Specific Heat Capacity, J/kg-K 550
470
Thermal Expansion, µm/m-K 9.9
12

Otherwise Unclassified Properties

Base Metal Price, % relative 37
2.3
Density, g/cm3 4.6
7.8
Embodied Carbon, kg CO2/kg material 40
1.5
Embodied Energy, MJ/kg 650
19
Embodied Water, L/kg 220
49

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 26 to 120
86
Resilience: Unit (Modulus of Resilience), kJ/m3 2890 to 3890
660
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 34
24
Strength to Weight: Axial, points 55 to 58
21
Strength to Weight: Bending, points 45 to 47
20
Thermal Shock Resistance, points 62 to 66
19

Alloy Composition


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Aluminum (Al), % 5.0 to 6.0
0
Carbon (C), % 0 to 0.1
0.13 to 0.18
Chlorine (Cl), % 0 to 0.2
0
Chromium (Cr), % 0
0.3 to 0.5
Copper (Cu), % 0.35 to 1.0
0
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0.35 to 1.0
97.4 to 98.4
Manganese (Mn), % 0
0.7 to 0.9
Molybdenum (Mo), % 0
0.080 to 0.15
Nickel (Ni), % 0
0.2 to 0.4
Nitrogen (N), % 0 to 0.040
0
Oxygen (O), % 0 to 0.3
0
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 0.1
0.15 to 0.35
Sodium (Na), % 0 to 0.2
0
Sulfur (S), % 0
0 to 0.040
Tin (Sn), % 1.5 to 2.5
0
Titanium (Ti), % 82.1 to 87.8
0
Vanadium (V), % 5.0 to 6.0
0
Residuals, % 0 to 0.4
0