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SAE-AISI H21 Steel vs. ASTM B817 Type I

SAE-AISI H21 steel belongs to the iron alloys classification, while ASTM B817 type I belongs to the titanium alloys. There are 21 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI H21 steel and the bottom bar is ASTM B817 type I.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
100
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 76
40
Tensile Strength: Ultimate (UTS), MPa 720 to 1790
770 to 960

Thermal Properties

Latent Heat of Fusion, J/g 250
410
Melting Completion (Liquidus), °C 1630
1600
Melting Onset (Solidus), °C 1580
1550
Specific Heat Capacity, J/kg-K 440
560
Thermal Conductivity, W/m-K 27
7.1
Thermal Expansion, µm/m-K 11
9.6

Otherwise Unclassified Properties

Base Metal Price, % relative 23
36
Density, g/cm3 8.5
4.4
Embodied Carbon, kg CO2/kg material 4.5
38
Embodied Energy, MJ/kg 68
610
Embodied Water, L/kg 72
200

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 23
35
Strength to Weight: Axial, points 23 to 58
48 to 60
Strength to Weight: Bending, points 21 to 38
42 to 49
Thermal Diffusivity, mm2/s 7.1
2.9
Thermal Shock Resistance, points 24 to 59
54 to 68

Alloy Composition

Aluminum (Al), % 0
5.5 to 6.8
Carbon (C), % 0.28 to 0.36
0 to 0.1
Chlorine (Cl), % 0
0 to 0.2
Chromium (Cr), % 3.0 to 3.8
0
Copper (Cu), % 0 to 0.25
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 87.6 to 93.8
0 to 0.4
Manganese (Mn), % 0.15 to 0.4
0
Nickel (Ni), % 0 to 0.3
0
Nitrogen (N), % 0
0 to 0.040
Oxygen (O), % 0
0 to 0.3
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0.15 to 0.5
0 to 0.1
Sodium (Na), % 0
0 to 0.2
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
87 to 91
Tungsten (W), % 8.5 to 10
0
Vanadium (V), % 0.3 to 0.6
3.5 to 4.5
Residuals, % 0
0 to 0.4