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ASTM B817 Type II vs. ACI-ASTM CF20 Steel

ASTM B817 type II belongs to the titanium alloys classification, while ACI-ASTM CF20 steel belongs to the iron alloys. There are 25 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is ASTM B817 type II and the bottom bar is ACI-ASTM CF20 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 100
200
Elongation at Break, % 3.0 to 13
50
Fatigue Strength, MPa 390 to 530
240
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 40
77
Tensile Strength: Ultimate (UTS), MPa 900 to 960
530
Tensile Strength: Yield (Proof), MPa 780 to 900
250

Thermal Properties

Latent Heat of Fusion, J/g 400
300
Maximum Temperature: Mechanical, °C 350
970
Melting Completion (Liquidus), °C 1580
1420
Melting Onset (Solidus), °C 1530
1410
Specific Heat Capacity, J/kg-K 550
480
Thermal Expansion, µm/m-K 9.9
17

Otherwise Unclassified Properties

Base Metal Price, % relative 37
16
Density, g/cm3 4.6
7.8
Embodied Carbon, kg CO2/kg material 40
3.1
Embodied Energy, MJ/kg 650
44
Embodied Water, L/kg 220
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 26 to 120
220
Resilience: Unit (Modulus of Resilience), kJ/m3 2890 to 3890
160
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 34
25
Strength to Weight: Axial, points 55 to 58
19
Strength to Weight: Bending, points 45 to 47
19
Thermal Shock Resistance, points 62 to 66
11

Alloy Composition

Aluminum (Al), % 5.0 to 6.0
0
Carbon (C), % 0 to 0.1
0 to 0.2
Chlorine (Cl), % 0 to 0.2
0
Chromium (Cr), % 0
18 to 21
Copper (Cu), % 0.35 to 1.0
0
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0.35 to 1.0
64.2 to 74
Manganese (Mn), % 0
0 to 1.5
Nickel (Ni), % 0
8.0 to 11
Nitrogen (N), % 0 to 0.040
0
Oxygen (O), % 0 to 0.3
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.1
0 to 2.0
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