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ACI-ASTM CF20 Steel vs. S42300 Stainless Steel

Both ACI-ASTM CF20 steel and S42300 stainless steel are iron alloys. Both are furnished in the heat treated (HT) condition. They have 82% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CF20 steel and the bottom bar is S42300 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
330
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 50
9.1
Fatigue Strength, MPa 240
440
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
77
Tensile Strength: Ultimate (UTS), MPa 530
1100
Tensile Strength: Yield (Proof), MPa 250
850

Thermal Properties

Latent Heat of Fusion, J/g 300
270
Maximum Temperature: Corrosion, °C 420
380
Maximum Temperature: Mechanical, °C 970
750
Melting Completion (Liquidus), °C 1420
1470
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 16
25
Thermal Expansion, µm/m-K 17
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
4.5
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
5.2

Otherwise Unclassified Properties

Base Metal Price, % relative 16
9.5
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.1
3.2
Embodied Energy, MJ/kg 44
44
Embodied Water, L/kg 150
110

Common Calculations

PREN (Pitting Resistance) 20
21
Resilience: Ultimate (Unit Rupture Work), MJ/m3 220
93
Resilience: Unit (Modulus of Resilience), kJ/m3 160
1840
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
39
Strength to Weight: Bending, points 19
30
Thermal Diffusivity, mm2/s 4.3
6.8
Thermal Shock Resistance, points 11
40

Alloy Composition

Carbon (C), % 0 to 0.2
0.27 to 0.32
Chromium (Cr), % 18 to 21
11 to 12
Iron (Fe), % 64.2 to 74
82 to 85.1
Manganese (Mn), % 0 to 1.5
1.0 to 1.4
Molybdenum (Mo), % 0
2.5 to 3.0
Nickel (Ni), % 8.0 to 11
0 to 0.5
Phosphorus (P), % 0 to 0.040
0 to 0.025
Silicon (Si), % 0 to 2.0
0 to 0.5
Sulfur (S), % 0 to 0.040
0 to 0.025
Vanadium (V), % 0
0.2 to 0.3