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ACI-ASTM CN3MN Steel vs. AISI 418 Stainless Steel

Both ACI-ASTM CN3MN steel and AISI 418 stainless steel are iron alloys. Both are furnished in the heat treated (HT) condition. They have 62% 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 CN3MN steel and the bottom bar is AISI 418 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
330
Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 39
17
Fatigue Strength, MPa 250
520
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 80
77
Tensile Strength: Ultimate (UTS), MPa 620
1100
Tensile Strength: Yield (Proof), MPa 300
850

Thermal Properties

Latent Heat of Fusion, J/g 310
270
Maximum Temperature: Corrosion, °C 430
390
Maximum Temperature: Mechanical, °C 1100
770
Melting Completion (Liquidus), °C 1460
1500
Melting Onset (Solidus), °C 1410
1460
Specific Heat Capacity, J/kg-K 460
470
Thermal Conductivity, W/m-K 13
25
Thermal Expansion, µm/m-K 16
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
2.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.0
3.1

Otherwise Unclassified Properties

Base Metal Price, % relative 33
15
Density, g/cm3 8.1
8.0
Embodied Carbon, kg CO2/kg material 6.2
2.9
Embodied Energy, MJ/kg 84
41
Embodied Water, L/kg 200
110

Common Calculations

PREN (Pitting Resistance) 46
19
Resilience: Ultimate (Unit Rupture Work), MJ/m3 200
170
Resilience: Unit (Modulus of Resilience), kJ/m3 210
1830
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 21
38
Strength to Weight: Bending, points 20
29
Thermal Diffusivity, mm2/s 3.4
6.7
Thermal Shock Resistance, points 14
40

Alloy Composition

Carbon (C), % 0 to 0.030
0.15 to 0.2
Chromium (Cr), % 20 to 22
12 to 14
Copper (Cu), % 0 to 0.75
0
Iron (Fe), % 41.4 to 50.3
78.5 to 83.6
Manganese (Mn), % 0 to 2.0
0 to 0.5
Molybdenum (Mo), % 6.0 to 7.0
0 to 0.5
Nickel (Ni), % 23.5 to 25.5
1.8 to 2.2
Nitrogen (N), % 0.18 to 0.26
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0 to 0.010
0 to 0.030
Tungsten (W), % 0
2.5 to 3.5