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EN 1.4308 Stainless Steel vs. SAE-AISI 8740 Steel

Both EN 1.4308 stainless steel and SAE-AISI 8740 steel are iron alloys. They have 72% 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 1.4308 stainless steel and the bottom bar is SAE-AISI 8740 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
170 to 200
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 34
11 to 23
Fatigue Strength, MPa 160
270 to 350
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
73
Tensile Strength: Ultimate (UTS), MPa 510
580 to 670
Tensile Strength: Yield (Proof), MPa 200
380 to 570

Thermal Properties

Latent Heat of Fusion, J/g 290
250
Maximum Temperature: Mechanical, °C 960
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
39
Thermal Expansion, µm/m-K 17
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.3
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 15
2.6
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.0
1.5
Embodied Energy, MJ/kg 43
20
Embodied Water, L/kg 150
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
71 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 100
390 to 850
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 18
20 to 24
Strength to Weight: Bending, points 18
20 to 22
Thermal Diffusivity, mm2/s 4.1
10
Thermal Shock Resistance, points 11
17 to 20

Alloy Composition

Carbon (C), % 0 to 0.070
0.38 to 0.43
Chromium (Cr), % 18 to 20
0.4 to 0.6
Iron (Fe), % 65.9 to 74
96.5 to 97.7
Manganese (Mn), % 0 to 1.5
0.75 to 1.0
Molybdenum (Mo), % 0
0.2 to 0.3
Nickel (Ni), % 8.0 to 11
0.4 to 0.7
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 1.5
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040