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ACI-ASTM CN3M Steel vs. S21900 Stainless Steel

Both ACI-ASTM CN3M steel and S21900 stainless steel are iron alloys. They have 76% 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 CN3M steel and the bottom bar is S21900 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
220
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 34
50
Fatigue Strength, MPa 150
380
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 80
78
Tensile Strength: Ultimate (UTS), MPa 500
710
Tensile Strength: Yield (Proof), MPa 190
390

Thermal Properties

Latent Heat of Fusion, J/g 310
290
Maximum Temperature: Corrosion, °C 430
420
Maximum Temperature: Mechanical, °C 1100
980
Melting Completion (Liquidus), °C 1450
1400
Melting Onset (Solidus), °C 1400
1350
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 13
14
Thermal Expansion, µm/m-K 16
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.7
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 1.9
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 31
15
Density, g/cm3 8.1
7.7
Embodied Carbon, kg CO2/kg material 5.9
3.0
Embodied Energy, MJ/kg 80
43
Embodied Water, L/kg 200
160

Common Calculations

PREN (Pitting Resistance) 38
25
Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
300
Resilience: Unit (Modulus of Resilience), kJ/m3 89
380
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 17
26
Strength to Weight: Bending, points 17
23
Thermal Diffusivity, mm2/s 3.4
3.8
Thermal Shock Resistance, points 11
15

Alloy Composition

Carbon (C), % 0 to 0.030
0 to 0.080
Chromium (Cr), % 20 to 22
19 to 21.5
Iron (Fe), % 42.4 to 52.5
59.4 to 67.4
Manganese (Mn), % 0 to 2.0
8.0 to 10
Molybdenum (Mo), % 4.5 to 5.5
0
Nickel (Ni), % 23 to 27
5.5 to 7.5
Nitrogen (N), % 0
0.15 to 0.4
Phosphorus (P), % 0 to 0.030
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030