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SAE-AISI 1090 Steel vs. S20431 Stainless Steel

Both SAE-AISI 1090 steel and S20431 stainless steel are iron alloys. They have 71% 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 SAE-AISI 1090 steel and the bottom bar is S20431 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220 to 280
210
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 11
46
Fatigue Strength, MPa 320 to 380
320
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
76
Shear Strength, MPa 470 to 570
500
Tensile Strength: Ultimate (UTS), MPa 790 to 950
710
Tensile Strength: Yield (Proof), MPa 520 to 610
350

Thermal Properties

Latent Heat of Fusion, J/g 240
280
Maximum Temperature: Mechanical, °C 400
890
Melting Completion (Liquidus), °C 1450
1400
Melting Onset (Solidus), °C 1410
1360
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 50
15
Thermal Expansion, µm/m-K 12
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.1
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.2
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
12
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.4
2.5
Embodied Energy, MJ/kg 19
36
Embodied Water, L/kg 46
140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 82 to 91
270
Resilience: Unit (Modulus of Resilience), kJ/m3 730 to 1000
310
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 28 to 34
25
Strength to Weight: Bending, points 24 to 27
23
Thermal Diffusivity, mm2/s 13
4.0
Thermal Shock Resistance, points 25 to 31
15

Alloy Composition

Carbon (C), % 0.85 to 1.0
0 to 0.12
Chromium (Cr), % 0
17 to 18
Copper (Cu), % 0
1.5 to 3.5
Iron (Fe), % 98 to 98.6
66.1 to 74.4
Manganese (Mn), % 0.6 to 0.9
5.0 to 7.0
Nickel (Ni), % 0
2.0 to 4.0
Nitrogen (N), % 0
0.1 to 0.25
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0 to 0.050
0 to 0.030