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ACI-ASTM CA40F Steel vs. S82121 Stainless Steel

Both ACI-ASTM CA40F steel and S82121 stainless steel are iron alloys. They have 86% 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 CA40F steel and the bottom bar is S82121 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 230
250
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 13
28
Fatigue Strength, MPa 320
370
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 76
78
Tensile Strength: Ultimate (UTS), MPa 770
730
Tensile Strength: Yield (Proof), MPa 550
510

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Maximum Temperature: Corrosion, °C 390
430
Maximum Temperature: Mechanical, °C 750
1020
Melting Completion (Liquidus), °C 1430
1430
Melting Onset (Solidus), °C 1390
1380
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 27
15
Thermal Expansion, µm/m-K 10
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.0
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 3.5
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 7.5
14
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 2.0
2.8
Embodied Energy, MJ/kg 28
40
Embodied Water, L/kg 100
150

Common Calculations

PREN (Pitting Resistance) 14
28
Resilience: Ultimate (Unit Rupture Work), MJ/m3 94
180
Resilience: Unit (Modulus of Resilience), kJ/m3 790
660
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 28
26
Strength to Weight: Bending, points 24
23
Thermal Diffusivity, mm2/s 7.2
4.0
Thermal Shock Resistance, points 28
20

Alloy Composition

Carbon (C), % 0.2 to 0.4
0 to 0.035
Chromium (Cr), % 11.5 to 14
21 to 23
Copper (Cu), % 0
0.2 to 1.2
Iron (Fe), % 81.6 to 88.3
66.7 to 75.4
Manganese (Mn), % 0 to 1.0
1.0 to 2.5
Molybdenum (Mo), % 0 to 0.5
0.3 to 1.3
Nickel (Ni), % 0 to 1.0
2.0 to 4.0
Nitrogen (N), % 0
0.15 to 0.25
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.5
0 to 1.0
Sulfur (S), % 0.2 to 0.4
0 to 0.010