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SAE-AISI 1140 Steel vs. AISI 422 Stainless Steel

Both SAE-AISI 1140 steel and AISI 422 stainless steel are iron alloys. They have 85% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 1140 steel and the bottom bar is AISI 422 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170 to 180
260 to 330
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 14 to 18
15 to 17
Fatigue Strength, MPa 230 to 370
410 to 500
Poisson's Ratio 0.29
0.28
Reduction in Area, % 39 to 46
34 to 40
Shear Modulus, GPa 72
76
Shear Strength, MPa 370 to 420
560 to 660
Tensile Strength: Ultimate (UTS), MPa 600 to 700
910 to 1080
Tensile Strength: Yield (Proof), MPa 340 to 570
670 to 870

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Maximum Temperature: Mechanical, °C 400
650
Melting Completion (Liquidus), °C 1460
1480
Melting Onset (Solidus), °C 1420
1470
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 51
24
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.0
4.7
Electrical Conductivity: Equal Weight (Specific), % IACS 8.1
5.3

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
11
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.4
3.1
Embodied Energy, MJ/kg 18
44
Embodied Water, L/kg 46
100

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 89 to 93
140 to 150
Resilience: Unit (Modulus of Resilience), kJ/m3 310 to 870
1140 to 1910
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 21 to 25
32 to 38
Strength to Weight: Bending, points 20 to 22
26 to 30
Thermal Diffusivity, mm2/s 14
6.4
Thermal Shock Resistance, points 18 to 21
33 to 39

Alloy Composition

Carbon (C), % 0.37 to 0.44
0.2 to 0.25
Chromium (Cr), % 0
11 to 12.5
Iron (Fe), % 98.4 to 98.9
81.9 to 85.8
Manganese (Mn), % 0.7 to 1.0
0.5 to 1.0
Molybdenum (Mo), % 0
0.9 to 1.3
Nickel (Ni), % 0
0.5 to 1.0
Phosphorus (P), % 0 to 0.040
0 to 0.025
Silicon (Si), % 0
0 to 0.5
Sulfur (S), % 0.080 to 0.13
0 to 0.025
Tungsten (W), % 0
0.9 to 1.3
Vanadium (V), % 0
0.2 to 0.3