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AISI 431 Stainless Steel vs. ACI-ASTM CN7MS Steel

Both AISI 431 stainless steel and ACI-ASTM CN7MS 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 AISI 431 stainless steel and the bottom bar is ACI-ASTM CN7MS steel.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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