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SAE-AISI H21 Steel vs. ACI-ASTM CF20 Steel

Both SAE-AISI H21 steel and ACI-ASTM CF20 steel are iron alloys. They have 73% 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 CF20 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
77
Tensile Strength: Ultimate (UTS), MPa 720 to 1790
530

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Melting Completion (Liquidus), °C 1630
1420
Melting Onset (Solidus), °C 1580
1410
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 27
16
Thermal Expansion, µm/m-K 11
17

Otherwise Unclassified Properties

Base Metal Price, % relative 23
16
Density, g/cm3 8.5
7.8
Embodied Carbon, kg CO2/kg material 4.5
3.1
Embodied Energy, MJ/kg 68
44
Embodied Water, L/kg 72
150

Common Calculations

PREN (Pitting Resistance) 19
20
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
11

Alloy Composition

Carbon (C), % 0.28 to 0.36
0 to 0.2
Chromium (Cr), % 3.0 to 3.8
18 to 21
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 87.6 to 93.8
64.2 to 74
Manganese (Mn), % 0.15 to 0.4
0 to 1.5
Nickel (Ni), % 0 to 0.3
8.0 to 11
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