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ASTM A369 Grade FP21 vs. Grade 7 Titanium

ASTM A369 grade FP21 belongs to the iron alloys classification, while grade 7 titanium belongs to the titanium alloys. There are 30 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 ASTM A369 grade FP21 and the bottom bar is grade 7 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
150
Elastic (Young's, Tensile) Modulus, GPa 190
110
Elongation at Break, % 20
24
Fatigue Strength, MPa 160
250
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 74
38
Shear Strength, MPa 300
270
Tensile Strength: Ultimate (UTS), MPa 470
420
Tensile Strength: Yield (Proof), MPa 240
340

Thermal Properties

Latent Heat of Fusion, J/g 260
420
Maximum Temperature: Mechanical, °C 470
320
Melting Completion (Liquidus), °C 1470
1660
Melting Onset (Solidus), °C 1430
1610
Specific Heat Capacity, J/kg-K 470
540
Thermal Conductivity, W/m-K 41
22
Thermal Expansion, µm/m-K 13
9.2

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.7
3.6
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
7.2

Otherwise Unclassified Properties

Density, g/cm3 7.8
4.5
Embodied Carbon, kg CO2/kg material 1.8
47
Embodied Energy, MJ/kg 23
800
Embodied Water, L/kg 61
470

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 80
95
Resilience: Unit (Modulus of Resilience), kJ/m3 150
560
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
35
Strength to Weight: Axial, points 17
26
Strength to Weight: Bending, points 17
28
Thermal Diffusivity, mm2/s 11
8.9
Thermal Shock Resistance, points 14
31

Alloy Composition

Carbon (C), % 0.050 to 0.15
0 to 0.080
Chromium (Cr), % 2.7 to 3.4
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 94.3 to 96.2
0 to 0.3
Manganese (Mn), % 0.3 to 0.6
0
Molybdenum (Mo), % 0.8 to 1.1
0
Nitrogen (N), % 0
0 to 0.030
Oxygen (O), % 0
0 to 0.25
Palladium (Pd), % 0
0.12 to 0.25
Phosphorus (P), % 0 to 0.025
0
Silicon (Si), % 0 to 0.5
0
Sulfur (S), % 0 to 0.025
0
Titanium (Ti), % 0
98.7 to 99.88
Residuals, % 0
0 to 0.4