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AISI 431 Stainless Steel vs. ACI-ASTM CF3 Steel

Both AISI 431 stainless steel and ACI-ASTM CF3 steel are iron alloys. They have 88% 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 431 stainless steel and the bottom bar is ACI-ASTM CF3 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 250
140
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 15 to 17
60
Fatigue Strength, MPa 430 to 610
270
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
77
Tensile Strength: Ultimate (UTS), MPa 890 to 1380
510
Tensile Strength: Yield (Proof), MPa 710 to 1040
250

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Maximum Temperature: Corrosion, °C 400
420
Maximum Temperature: Mechanical, °C 850
960
Melting Completion (Liquidus), °C 1510
1420
Melting Onset (Solidus), °C 1450
1450
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 26
16
Thermal Expansion, µm/m-K 12
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.6
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 3.0
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
16
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 2.2
3.2
Embodied Energy, MJ/kg 31
45
Embodied Water, L/kg 120
150

Common Calculations

PREN (Pitting Resistance) 16
20
Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 180
250
Resilience: Unit (Modulus of Resilience), kJ/m3 1270 to 2770
160
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 32 to 50
18
Strength to Weight: Bending, points 27 to 36
18
Thermal Diffusivity, mm2/s 7.0
4.3
Thermal Shock Resistance, points 28 to 43
11

Alloy Composition

Carbon (C), % 0 to 0.2
0 to 0.030
Chromium (Cr), % 15 to 17
17 to 21
Iron (Fe), % 78.2 to 83.8
62.9 to 75
Manganese (Mn), % 0 to 1.0
0 to 1.5
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 1.3 to 2.5
8.0 to 12
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 2.0
Sulfur (S), % 0 to 0.030
0 to 0.040