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ACI-ASTM CN7MS Steel vs. AISI 431 Stainless Steel

Both ACI-ASTM CN7MS steel and AISI 431 stainless steel are iron alloys. They have 68% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CN7MS steel and the bottom bar is AISI 431 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
250
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 39
15 to 17
Fatigue Strength, MPa 200
430 to 610
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
77
Tensile Strength: Ultimate (UTS), MPa 540
890 to 1380
Tensile Strength: Yield (Proof), MPa 230
710 to 1040

Thermal Properties

Latent Heat of Fusion, J/g 340
280
Maximum Temperature: Corrosion, °C 420
400
Maximum Temperature: Mechanical, °C 1040
850
Melting Completion (Liquidus), °C 1400
1510
Melting Onset (Solidus), °C 1350
1450
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 12
26
Thermal Expansion, µm/m-K 16
12

Otherwise Unclassified Properties

Base Metal Price, % relative 28
9.0
Density, g/cm3 7.9
7.7
Embodied Carbon, kg CO2/kg material 5.1
2.2
Embodied Energy, MJ/kg 71
31
Embodied Water, L/kg 180
120

Common Calculations

PREN (Pitting Resistance) 28
16
Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
140 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 140
1270 to 2770
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
32 to 50
Strength to Weight: Bending, points 19
27 to 36
Thermal Diffusivity, mm2/s 3.2
7.0
Thermal Shock Resistance, points 13
28 to 43

Alloy Composition

Carbon (C), % 0 to 0.070
0 to 0.2
Chromium (Cr), % 18 to 20
15 to 17
Copper (Cu), % 1.5 to 2.0
0
Iron (Fe), % 45.4 to 53.5
78.2 to 83.8
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 2.5 to 3.0
0
Nickel (Ni), % 22 to 25
1.3 to 2.5
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 2.5 to 3.5
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030