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ASTM Grade HN Steel vs. Grade 38 Titanium

ASTM grade HN steel belongs to the iron alloys classification, while grade 38 titanium belongs to the titanium alloys. There are 23 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is ASTM grade HN steel and the bottom bar is grade 38 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
110
Elongation at Break, % 9.0
11
Poisson's Ratio 0.28
0.32
Shear Modulus, GPa 77
40
Tensile Strength: Ultimate (UTS), MPa 500
1000

Thermal Properties

Latent Heat of Fusion, J/g 310
410
Maximum Temperature: Mechanical, °C 1080
330
Melting Completion (Liquidus), °C 1400
1620
Melting Onset (Solidus), °C 1350
1570
Specific Heat Capacity, J/kg-K 480
550
Thermal Conductivity, W/m-K 13
8.0
Thermal Expansion, µm/m-K 16
9.3

Otherwise Unclassified Properties

Base Metal Price, % relative 26
36
Density, g/cm3 7.9
4.5
Embodied Carbon, kg CO2/kg material 4.6
35
Embodied Energy, MJ/kg 66
560
Embodied Water, L/kg 180
160

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
35
Strength to Weight: Axial, points 17
62
Strength to Weight: Bending, points 18
49
Thermal Diffusivity, mm2/s 3.5
3.2
Thermal Shock Resistance, points 11
72

Alloy Composition

Aluminum (Al), % 0
3.5 to 4.5
Carbon (C), % 0.2 to 0.5
0 to 0.080
Chromium (Cr), % 19 to 23
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 44.9 to 57.8
1.2 to 1.8
Manganese (Mn), % 0 to 2.0
0
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 23 to 27
0
Nitrogen (N), % 0
0 to 0.030
Oxygen (O), % 0
0.2 to 0.3
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 2.0
0
Sulfur (S), % 0 to 0.040
0
Titanium (Ti), % 0
89.9 to 93.1
Vanadium (V), % 0
2.0 to 3.0
Residuals, % 0
0 to 0.4