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SAE-AISI 1140 Steel vs. AISI 440C Stainless Steel

Both SAE-AISI 1140 steel and AISI 440C stainless steel are iron alloys. They have 81% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (5, 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 440C stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 14 to 18
2.0 to 14
Fatigue Strength, MPa 230 to 370
260 to 840
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
76
Shear Strength, MPa 370 to 420
430 to 1120
Tensile Strength: Ultimate (UTS), MPa 600 to 700
710 to 1970
Tensile Strength: Yield (Proof), MPa 340 to 570
450 to 1900

Thermal Properties

Latent Heat of Fusion, J/g 250
280
Maximum Temperature: Mechanical, °C 400
870
Melting Completion (Liquidus), °C 1460
1480
Melting Onset (Solidus), °C 1420
1370
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 51
22
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.0
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.1
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
9.0
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.4
2.2
Embodied Energy, MJ/kg 18
31
Embodied Water, L/kg 46
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 89 to 93
39 to 88
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 21 to 25
26 to 71
Strength to Weight: Bending, points 20 to 22
23 to 46
Thermal Diffusivity, mm2/s 14
6.0
Thermal Shock Resistance, points 18 to 21
26 to 71

Alloy Composition

Carbon (C), % 0.37 to 0.44
1.0 to 1.2
Chromium (Cr), % 0
16 to 18
Iron (Fe), % 98.4 to 98.9
78 to 83.1
Manganese (Mn), % 0.7 to 1.0
0 to 1.0
Molybdenum (Mo), % 0
0 to 0.75
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0.080 to 0.13
0 to 0.015