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ACI-ASTM CA40 Steel vs. S40920 Stainless Steel

Both ACI-ASTM CA40 steel and S40920 stainless steel are iron alloys. They have a very high 97% 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 CA40 steel and the bottom bar is S40920 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 310
150
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 10
22
Fatigue Strength, MPa 460
130
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
75
Tensile Strength: Ultimate (UTS), MPa 910
430
Tensile Strength: Yield (Proof), MPa 860
190

Thermal Properties

Latent Heat of Fusion, J/g 280
270
Maximum Temperature: Corrosion, °C 390
450
Maximum Temperature: Mechanical, °C 750
710
Melting Completion (Liquidus), °C 1440
1450
Melting Onset (Solidus), °C 1500
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 25
26
Thermal Expansion, µm/m-K 10
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.0
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 3.5
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 7.5
6.5
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 2.0
2.0
Embodied Energy, MJ/kg 28
28
Embodied Water, L/kg 100
94

Common Calculations

PREN (Pitting Resistance) 14
11
Resilience: Ultimate (Unit Rupture Work), MJ/m3 89
78
Resilience: Unit (Modulus of Resilience), kJ/m3 1910
97
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 33
15
Strength to Weight: Bending, points 27
16
Thermal Diffusivity, mm2/s 6.7
6.9
Thermal Shock Resistance, points 33
15

Alloy Composition

Carbon (C), % 0.2 to 0.4
0 to 0.030
Chromium (Cr), % 11.5 to 14
10.5 to 11.7
Iron (Fe), % 81.5 to 88.3
85.1 to 89.4
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 0 to 1.0
0 to 0.5
Niobium (Nb), % 0
0 to 0.1
Nitrogen (N), % 0
0 to 0.030
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.5
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.020
Titanium (Ti), % 0
0.15 to 0.5