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AISI 431 Stainless Steel vs. SAE-AISI 1144 Steel

Both AISI 431 stainless steel and SAE-AISI 1144 steel are iron alloys. They have 82% of their average alloy composition in common. There are 31 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 SAE-AISI 1144 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 250
220 to 230
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 15 to 17
11 to 17
Fatigue Strength, MPa 430 to 610
280 to 430
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
72
Shear Strength, MPa 550 to 840
460 to 510
Tensile Strength: Ultimate (UTS), MPa 890 to 1380
750 to 840
Tensile Strength: Yield (Proof), MPa 710 to 1040
420 to 690

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Maximum Temperature: Mechanical, °C 850
400
Melting Completion (Liquidus), °C 1510
1450
Melting Onset (Solidus), °C 1450
1410
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 26
51
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.6
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 3.0
8.2

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
1.9
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 2.2
1.4
Embodied Energy, MJ/kg 31
19
Embodied Water, L/kg 120
47

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 180
91 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 1270 to 2770
480 to 1290
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 32 to 50
27 to 30
Strength to Weight: Bending, points 27 to 36
23 to 25
Thermal Diffusivity, mm2/s 7.0
14
Thermal Shock Resistance, points 28 to 43
22 to 24

Alloy Composition

Carbon (C), % 0 to 0.2
0.4 to 0.48
Chromium (Cr), % 15 to 17
0
Iron (Fe), % 78.2 to 83.8
97.5 to 98
Manganese (Mn), % 0 to 1.0
1.4 to 1.7
Nickel (Ni), % 1.3 to 2.5
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0
Sulfur (S), % 0 to 0.030
0.24 to 0.33