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AISI 440A Stainless Steel vs. ACI-ASTM CN3MN Steel

Both AISI 440A stainless steel and ACI-ASTM CN3MN steel are iron alloys. They have 64% of their average alloy composition in common. There are 30 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 AISI 440A stainless steel and the bottom bar is ACI-ASTM CN3MN steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 5.0 to 20
39
Fatigue Strength, MPa 270 to 790
250
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
80
Tensile Strength: Ultimate (UTS), MPa 730 to 1790
620
Tensile Strength: Yield (Proof), MPa 420 to 1650
300

Thermal Properties

Latent Heat of Fusion, J/g 280
310
Maximum Temperature: Corrosion, °C 400
430
Maximum Temperature: Mechanical, °C 760
1100
Melting Completion (Liquidus), °C 1480
1460
Melting Onset (Solidus), °C 1370
1410
Specific Heat Capacity, J/kg-K 480
460
Thermal Conductivity, W/m-K 23
13
Thermal Expansion, µm/m-K 10
16

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
33
Density, g/cm3 7.7
8.1
Embodied Carbon, kg CO2/kg material 2.2
6.2
Embodied Energy, MJ/kg 31
84
Embodied Water, L/kg 120
200

Common Calculations

PREN (Pitting Resistance) 18
46
Resilience: Ultimate (Unit Rupture Work), MJ/m3 87 to 120
200
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 26 to 65
21
Strength to Weight: Bending, points 23 to 43
20
Thermal Diffusivity, mm2/s 6.2
3.4
Thermal Shock Resistance, points 26 to 65
14

Alloy Composition

Carbon (C), % 0.6 to 0.75
0 to 0.030
Chromium (Cr), % 16 to 18
20 to 22
Copper (Cu), % 0
0 to 0.75
Iron (Fe), % 78.4 to 83.4
41.4 to 50.3
Manganese (Mn), % 0 to 1.0
0 to 2.0
Molybdenum (Mo), % 0 to 0.75
6.0 to 7.0
Nickel (Ni), % 0
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 1.0
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.010