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SAE-AISI H21 Steel vs. ACI-ASTM CF8M Steel

Both SAE-AISI H21 steel and ACI-ASTM CF8M steel are iron alloys. They have 70% of their average alloy composition in common. There are 22 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 ACI-ASTM CF8M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 76
78
Tensile Strength: Ultimate (UTS), MPa 720 to 1790
540

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Melting Completion (Liquidus), °C 1630
1440
Melting Onset (Solidus), °C 1580
1400
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 27
16
Thermal Expansion, µm/m-K 11
16

Otherwise Unclassified Properties

Base Metal Price, % relative 23
19
Density, g/cm3 8.5
7.8
Embodied Carbon, kg CO2/kg material 4.5
3.8
Embodied Energy, MJ/kg 68
53
Embodied Water, L/kg 72
160

Common Calculations

PREN (Pitting Resistance) 19
28
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 23 to 58
19
Strength to Weight: Bending, points 21 to 38
19
Thermal Diffusivity, mm2/s 7.1
4.3
Thermal Shock Resistance, points 24 to 59
12

Alloy Composition

Carbon (C), % 0.28 to 0.36
0 to 0.080
Chromium (Cr), % 3.0 to 3.8
18 to 21
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 87.6 to 93.8
60.3 to 71
Manganese (Mn), % 0.15 to 0.4
0 to 1.5
Molybdenum (Mo), % 0
2.0 to 3.0
Nickel (Ni), % 0 to 0.3
9.0 to 12
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.15 to 0.5
0 to 2.0
Sulfur (S), % 0 to 0.030
0 to 0.040
Tungsten (W), % 8.5 to 10
0
Vanadium (V), % 0.3 to 0.6
0