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EN 1.4938 Stainless Steel vs. SAE-AISI 1140 Steel

Both EN 1.4938 stainless steel and SAE-AISI 1140 steel are iron alloys. They have 83% of their average alloy composition in common. There are 30 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 EN 1.4938 stainless steel and the bottom bar is SAE-AISI 1140 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 16 to 17
14 to 18
Fatigue Strength, MPa 390 to 520
230 to 370
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
72
Shear Strength, MPa 540 to 630
370 to 420
Tensile Strength: Ultimate (UTS), MPa 870 to 1030
600 to 700
Tensile Strength: Yield (Proof), MPa 640 to 870
340 to 570

Thermal Properties

Latent Heat of Fusion, J/g 270
250
Maximum Temperature: Mechanical, °C 750
400
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 30
51
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
7.0
Electrical Conductivity: Equal Weight (Specific), % IACS 3.3
8.1

Otherwise Unclassified Properties

Base Metal Price, % relative 10
1.8
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.3
1.4
Embodied Energy, MJ/kg 47
18
Embodied Water, L/kg 110
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 160
89 to 93
Resilience: Unit (Modulus of Resilience), kJ/m3 1050 to 1920
310 to 870
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 31 to 37
21 to 25
Strength to Weight: Bending, points 26 to 29
20 to 22
Thermal Diffusivity, mm2/s 8.1
14
Thermal Shock Resistance, points 30 to 35
18 to 21

Alloy Composition

Carbon (C), % 0.080 to 0.15
0.37 to 0.44
Chromium (Cr), % 11 to 12.5
0
Iron (Fe), % 80.5 to 84.8
98.4 to 98.9
Manganese (Mn), % 0.4 to 0.9
0.7 to 1.0
Molybdenum (Mo), % 1.5 to 2.0
0
Nickel (Ni), % 2.0 to 3.0
0
Nitrogen (N), % 0.020 to 0.040
0
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0 to 0.5
0
Sulfur (S), % 0 to 0.015
0.080 to 0.13
Vanadium (V), % 0.25 to 0.4
0