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EN 1.4378 Stainless Steel vs. SAE-AISI 8740 Steel

Both EN 1.4378 stainless steel and SAE-AISI 8740 steel are iron alloys. They have 67% of their average alloy composition in common. There are 27 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is EN 1.4378 stainless steel and the bottom bar is SAE-AISI 8740 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190 to 340
170 to 200
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 14 to 34
11 to 23
Fatigue Strength, MPa 340 to 550
270 to 350
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
73
Shear Strength, MPa 510 to 680
370 to 400
Tensile Strength: Ultimate (UTS), MPa 760 to 1130
580 to 670
Tensile Strength: Yield (Proof), MPa 430 to 970
380 to 570

Thermal Properties

Latent Heat of Fusion, J/g 290
250
Maximum Temperature: Mechanical, °C 910
410
Melting Completion (Liquidus), °C 1390
1460
Melting Onset (Solidus), °C 1350
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Expansion, µm/m-K 17
13

Otherwise Unclassified Properties

Base Metal Price, % relative 12
2.6
Density, g/cm3 7.6
7.8
Embodied Carbon, kg CO2/kg material 2.7
1.5
Embodied Energy, MJ/kg 39
20
Embodied Water, L/kg 150
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 150 to 220
71 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 470 to 2370
390 to 850
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 28 to 41
20 to 24
Strength to Weight: Bending, points 24 to 31
20 to 22
Thermal Shock Resistance, points 16 to 23
17 to 20

Alloy Composition

Carbon (C), % 0 to 0.080
0.38 to 0.43
Chromium (Cr), % 17 to 19
0.4 to 0.6
Iron (Fe), % 61.2 to 69
96.5 to 97.7
Manganese (Mn), % 11.5 to 14.5
0.75 to 1.0
Molybdenum (Mo), % 0
0.2 to 0.3
Nickel (Ni), % 2.3 to 3.7
0.4 to 0.7
Nitrogen (N), % 0.2 to 0.4
0
Phosphorus (P), % 0 to 0.060
0 to 0.035
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040