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AISI 418 Stainless Steel vs. ACI-ASTM CN3MN Steel

Both AISI 418 stainless steel and ACI-ASTM CN3MN 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 AISI 418 stainless steel and the bottom bar is ACI-ASTM CN3MN steel.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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