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ACI-ASTM CD3MN Steel vs. S81921 Stainless Steel

Both ACI-ASTM CD3MN steel and S81921 stainless steel are iron alloys. They have a moderately high 94% of their average alloy composition in common. There are 31 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 CD3MN steel and the bottom bar is S81921 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 29
29
Fatigue Strength, MPa 340
370
Poisson's Ratio 0.27
0.28
Shear Modulus, GPa 79
79
Tensile Strength: Ultimate (UTS), MPa 710
710
Tensile Strength: Yield (Proof), MPa 460
500

Thermal Properties

Latent Heat of Fusion, J/g 300
290
Maximum Temperature: Corrosion, °C 430
430
Maximum Temperature: Mechanical, °C 1060
990
Melting Completion (Liquidus), °C 1450
1430
Melting Onset (Solidus), °C 1400
1390
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 16
15
Thermal Expansion, µm/m-K 13
13

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 18
14
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 3.6
2.9
Embodied Energy, MJ/kg 50
41
Embodied Water, L/kg 160
150

Common Calculations

PREN (Pitting Resistance) 35
28
Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
180
Resilience: Unit (Modulus of Resilience), kJ/m3 530
630
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 25
25
Strength to Weight: Bending, points 23
23
Thermal Diffusivity, mm2/s 4.3
4.0
Thermal Shock Resistance, points 20
20

Alloy Composition

Carbon (C), % 0 to 0.030
0 to 0.030
Chromium (Cr), % 21 to 23.5
19 to 22
Copper (Cu), % 0 to 1.0
0
Iron (Fe), % 62.6 to 71.9
66.7 to 75.9
Manganese (Mn), % 0 to 1.5
2.0 to 4.0
Molybdenum (Mo), % 2.5 to 3.5
1.0 to 2.0
Nickel (Ni), % 4.5 to 6.5
2.0 to 4.0
Nitrogen (N), % 0.1 to 0.3
0.14 to 0.2
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.020
0 to 0.030