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ACI-ASTM CF20 Steel vs. S40910 Stainless Steel

Both ACI-ASTM CF20 steel and S40910 stainless steel are iron alloys. They have 81% of their average alloy composition in common. There are 32 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 S40910 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
160
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 50
23
Fatigue Strength, MPa 240
130
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
75
Tensile Strength: Ultimate (UTS), MPa 530
430
Tensile Strength: Yield (Proof), MPa 250
190

Thermal Properties

Latent Heat of Fusion, J/g 300
270
Maximum Temperature: Corrosion, °C 420
440
Maximum Temperature: Mechanical, °C 970
710
Melting Completion (Liquidus), °C 1420
1450
Melting Onset (Solidus), °C 1410
1410
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 16
26
Thermal Expansion, µm/m-K 17
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 16
7.0
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.1
2.0
Embodied Energy, MJ/kg 44
28
Embodied Water, L/kg 150
94

Common Calculations

PREN (Pitting Resistance) 20
11
Resilience: Ultimate (Unit Rupture Work), MJ/m3 220
80
Resilience: Unit (Modulus of Resilience), kJ/m3 160
94
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
16
Strength to Weight: Bending, points 19
16
Thermal Diffusivity, mm2/s 4.3
6.9
Thermal Shock Resistance, points 11
16

Alloy Composition

Carbon (C), % 0 to 0.2
0 to 0.030
Chromium (Cr), % 18 to 21
10.5 to 11.7
Iron (Fe), % 64.2 to 74
85 to 89.5
Manganese (Mn), % 0 to 1.5
0 to 1.0
Nickel (Ni), % 8.0 to 11
0 to 0.5
Niobium (Nb), % 0
0 to 0.17
Nitrogen (N), % 0
0 to 0.030
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 2.0
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.020
Titanium (Ti), % 0
0 to 0.5