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ACI-ASTM CF20 Steel vs. S44401 Stainless Steel

Both ACI-ASTM CF20 steel and S44401 stainless steel are iron alloys. They have 89% 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 S44401 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 50
21
Fatigue Strength, MPa 240
200
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
78
Tensile Strength: Ultimate (UTS), MPa 530
480
Tensile Strength: Yield (Proof), MPa 250
300

Thermal Properties

Latent Heat of Fusion, J/g 300
280
Maximum Temperature: Corrosion, °C 420
510
Maximum Temperature: Mechanical, °C 970
930
Melting Completion (Liquidus), °C 1420
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 16
22
Thermal Expansion, µm/m-K 17
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
2.6

Otherwise Unclassified Properties

Base Metal Price, % relative 16
12
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.1
2.9
Embodied Energy, MJ/kg 44
40
Embodied Water, L/kg 150
130

Common Calculations

PREN (Pitting Resistance) 20
26
Resilience: Ultimate (Unit Rupture Work), MJ/m3 220
90
Resilience: Unit (Modulus of Resilience), kJ/m3 160
230
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
17
Strength to Weight: Bending, points 19
18
Thermal Diffusivity, mm2/s 4.3
5.9
Thermal Shock Resistance, points 11
17

Alloy Composition

Carbon (C), % 0 to 0.2
0 to 0.025
Chromium (Cr), % 18 to 21
17.5 to 19.5
Iron (Fe), % 64.2 to 74
75.1 to 80.6
Manganese (Mn), % 0 to 1.5
0 to 1.0
Molybdenum (Mo), % 0
1.8 to 2.5
Nickel (Ni), % 8.0 to 11
0 to 1.0
Nitrogen (N), % 0
0 to 0.035
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 2.0
0
Sulfur (S), % 0 to 0.040
0 to 0.030
Titanium (Ti), % 0
0.2 to 0.8