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ACI-ASTM CF20 Steel vs. R30556 Alloy

Both ACI-ASTM CF20 steel and R30556 alloy are iron alloys. They have 60% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CF20 steel and the bottom bar is R30556 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 50
45
Fatigue Strength, MPa 240
320
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
81
Tensile Strength: Ultimate (UTS), MPa 530
780
Tensile Strength: Yield (Proof), MPa 250
350

Thermal Properties

Latent Heat of Fusion, J/g 300
300
Maximum Temperature: Corrosion, °C 420
450
Maximum Temperature: Mechanical, °C 970
1100
Melting Completion (Liquidus), °C 1420
1420
Melting Onset (Solidus), °C 1410
1330
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 16
11
Thermal Expansion, µm/m-K 17
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 16
70
Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 3.1
8.7
Embodied Energy, MJ/kg 44
130
Embodied Water, L/kg 150
300

Common Calculations

PREN (Pitting Resistance) 20
40
Resilience: Ultimate (Unit Rupture Work), MJ/m3 220
290
Resilience: Unit (Modulus of Resilience), kJ/m3 160
290
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 19
26
Strength to Weight: Bending, points 19
22
Thermal Diffusivity, mm2/s 4.3
2.9
Thermal Shock Resistance, points 11
18

Alloy Composition

Aluminum (Al), % 0
0.1 to 0.5
Boron (B), % 0
0 to 0.020
Carbon (C), % 0 to 0.2
0.050 to 0.15
Chromium (Cr), % 18 to 21
21 to 23
Cobalt (Co), % 0
16 to 21
Iron (Fe), % 64.2 to 74
20.4 to 38.2
Lanthanum (La), % 0
0.0050 to 0.1
Manganese (Mn), % 0 to 1.5
0.5 to 2.0
Molybdenum (Mo), % 0
2.5 to 4.0
Nickel (Ni), % 8.0 to 11
19 to 22.5
Niobium (Nb), % 0
0 to 0.3
Nitrogen (N), % 0
0.1 to 0.3
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 2.0
0.2 to 0.8
Sulfur (S), % 0 to 0.040
0 to 0.015
Tantalum (Ta), % 0
0.3 to 1.3
Tungsten (W), % 0
2.0 to 3.5
Zinc (Zn), % 0
0.0010 to 0.1