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EN 1.3940 Stainless Steel vs. SAE-AISI 4621 Steel

Both EN 1.3940 stainless steel and SAE-AISI 4621 steel are iron alloys. They have 71% 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 EN 1.3940 stainless steel and the bottom bar is SAE-AISI 4621 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 34
27
Fatigue Strength, MPa 190
270
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
73
Tensile Strength: Ultimate (UTS), MPa 540
500
Tensile Strength: Yield (Proof), MPa 240
360

Thermal Properties

Latent Heat of Fusion, J/g 290
250
Maximum Temperature: Mechanical, °C 930
410
Melting Completion (Liquidus), °C 1420
1460
Melting Onset (Solidus), °C 1380
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
46
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.3
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 17
3.3
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 3.3
1.6
Embodied Energy, MJ/kg 47
22
Embodied Water, L/kg 150
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 150
120
Resilience: Unit (Modulus of Resilience), kJ/m3 150
340
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 19
18
Strength to Weight: Bending, points 19
18
Thermal Diffusivity, mm2/s 4.1
12
Thermal Shock Resistance, points 16
15

Alloy Composition

Carbon (C), % 0 to 0.030
0.18 to 0.23
Chromium (Cr), % 16.5 to 18.5
0
Iron (Fe), % 64.2 to 71.4
96.1 to 97.1
Manganese (Mn), % 0 to 2.0
0.7 to 0.9
Molybdenum (Mo), % 0
0.2 to 0.3
Nickel (Ni), % 12 to 14
1.7 to 2.0
Nitrogen (N), % 0.1 to 0.2
0
Phosphorus (P), % 0 to 0.035
0 to 0.035
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.020
0 to 0.040