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AISI 431 Stainless Steel vs. S32808 Stainless Steel

Both AISI 431 stainless steel and S32808 stainless steel are iron alloys. They have 79% of their average alloy composition in common.

For each property being compared, the top bar is AISI 431 stainless steel and the bottom bar is S32808 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 250
270
Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 15 to 17
17
Fatigue Strength, MPa 430 to 610
350
Poisson's Ratio 0.28
0.27
Rockwell C Hardness 26
28
Shear Modulus, GPa 77
81
Shear Strength, MPa 550 to 840
480
Tensile Strength: Ultimate (UTS), MPa 890 to 1380
780
Tensile Strength: Yield (Proof), MPa 710 to 1040
570

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Maximum Temperature: Corrosion, °C 400
460
Maximum Temperature: Mechanical, °C 850
1100
Melting Completion (Liquidus), °C 1510
1470
Melting Onset (Solidus), °C 1450
1420
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 26
14
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.6
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 3.0
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
24
Density, g/cm3 7.7
7.9
Embodied Carbon, kg CO2/kg material 2.2
4.0
Embodied Energy, MJ/kg 31
57
Embodied Water, L/kg 120
180

Common Calculations

PREN (Pitting Resistance) 16
40
Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 180
120
Resilience: Unit (Modulus of Resilience), kJ/m3 1270 to 2770
790
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 32 to 50
27
Strength to Weight: Bending, points 27 to 36
24
Thermal Diffusivity, mm2/s 7.0
3.8
Thermal Shock Resistance, points 28 to 43
21

Alloy Composition

Carbon (C), % 0 to 0.2
0 to 0.030
Chromium (Cr), % 15 to 17
27 to 27.9
Iron (Fe), % 78.2 to 83.8
58.1 to 62.8
Manganese (Mn), % 0 to 1.0
0 to 1.1
Molybdenum (Mo), % 0
0.8 to 1.2
Nickel (Ni), % 1.3 to 2.5
7.0 to 8.2
Nitrogen (N), % 0
0.3 to 0.4
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.010
Tungsten (W), % 0
2.1 to 2.5