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EN 1.4405 Stainless Steel vs. SAE-AISI 8720 Steel

Both EN 1.4405 stainless steel and SAE-AISI 8720 steel are iron alloys. They have 79% 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 1.4405 stainless steel and the bottom bar is SAE-AISI 8720 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 17
25
Fatigue Strength, MPa 370
240
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
73
Tensile Strength: Ultimate (UTS), MPa 860
500
Tensile Strength: Yield (Proof), MPa 610
330

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Maximum Temperature: Mechanical, °C 870
410
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1400
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 17
39
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 13
2.6
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.8
1.5
Embodied Energy, MJ/kg 39
20
Embodied Water, L/kg 130
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
110
Resilience: Unit (Modulus of Resilience), kJ/m3 950
290
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 31
18
Strength to Weight: Bending, points 26
18
Thermal Diffusivity, mm2/s 4.6
10
Thermal Shock Resistance, points 29
17

Alloy Composition

Carbon (C), % 0 to 0.060
0.18 to 0.23
Chromium (Cr), % 15 to 17
0.4 to 0.6
Iron (Fe), % 73.6 to 80.3
96.8 to 98
Manganese (Mn), % 0 to 1.0
0.7 to 0.9
Molybdenum (Mo), % 0.7 to 1.5
0.2 to 0.3
Nickel (Ni), % 4.0 to 6.0
0.4 to 0.7
Phosphorus (P), % 0 to 0.035
0 to 0.035
Silicon (Si), % 0 to 0.8
0.15 to 0.35
Sulfur (S), % 0 to 0.025
0 to 0.040