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ACI-ASTM CN3MN Steel vs. S21904 Stainless Steel

Both ACI-ASTM CN3MN steel and S21904 stainless steel are iron alloys. They have 74% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CN3MN steel and the bottom bar is S21904 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
210 to 300
Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 39
17 to 51
Fatigue Strength, MPa 250
380 to 550
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 80
78
Tensile Strength: Ultimate (UTS), MPa 620
700 to 1000
Tensile Strength: Yield (Proof), MPa 300
390 to 910

Thermal Properties

Latent Heat of Fusion, J/g 310
290
Maximum Temperature: Corrosion, °C 430
430
Maximum Temperature: Mechanical, °C 1100
980
Melting Completion (Liquidus), °C 1460
1400
Melting Onset (Solidus), °C 1410
1350
Specific Heat Capacity, J/kg-K 460
480
Thermal Conductivity, W/m-K 13
14
Thermal Expansion, µm/m-K 16
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 2.0
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 33
15
Density, g/cm3 8.1
7.7
Embodied Carbon, kg CO2/kg material 6.2
3.0
Embodied Energy, MJ/kg 84
43
Embodied Water, L/kg 200
160

Common Calculations

PREN (Pitting Resistance) 46
25
Resilience: Ultimate (Unit Rupture Work), MJ/m3 200
160 to 310
Resilience: Unit (Modulus of Resilience), kJ/m3 210
380 to 2070
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 21
25 to 36
Strength to Weight: Bending, points 20
23 to 29
Thermal Diffusivity, mm2/s 3.4
3.8
Thermal Shock Resistance, points 14
15 to 21

Alloy Composition

Carbon (C), % 0 to 0.030
0 to 0.040
Chromium (Cr), % 20 to 22
19 to 21.5
Copper (Cu), % 0 to 0.75
0
Iron (Fe), % 41.4 to 50.3
59.5 to 67.4
Manganese (Mn), % 0 to 2.0
8.0 to 10
Molybdenum (Mo), % 6.0 to 7.0
0
Nickel (Ni), % 23.5 to 25.5
5.5 to 7.5
Nitrogen (N), % 0.18 to 0.26
0.15 to 0.4
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.010
0 to 0.030