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EN 1.8550 Steel vs. SAE-AISI 4320 Steel

Both EN 1.8550 steel and SAE-AISI 4320 steel are iron alloys. They have a very high 98% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is EN 1.8550 steel and the bottom bar is SAE-AISI 4320 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 300
160 to 240
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11
21 to 29
Fatigue Strength, MPa 470
320
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 600
370 to 500
Tensile Strength: Ultimate (UTS), MPa 1000
570 to 790
Tensile Strength: Yield (Proof), MPa 760
430 to 460

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 440
420
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 40
46
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
8.5

Otherwise Unclassified Properties

Base Metal Price, % relative 3.4
3.4
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.7
1.7
Embodied Energy, MJ/kg 23
22
Embodied Water, L/kg 67
52

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 100
140 to 150
Resilience: Unit (Modulus of Resilience), kJ/m3 1550
480 to 560
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 36
20 to 28
Strength to Weight: Bending, points 29
19 to 24
Thermal Diffusivity, mm2/s 11
13
Thermal Shock Resistance, points 29
19 to 27

Alloy Composition

Aluminum (Al), % 0.8 to 1.2
0
Carbon (C), % 0.3 to 0.37
0.17 to 0.22
Chromium (Cr), % 1.5 to 1.8
0.4 to 0.6
Iron (Fe), % 94.4 to 96.3
95.8 to 97
Manganese (Mn), % 0.4 to 0.7
0.45 to 0.65
Molybdenum (Mo), % 0.15 to 0.25
0.2 to 0.3
Nickel (Ni), % 0.85 to 1.2
1.7 to 2.0
Phosphorus (P), % 0 to 0.025
0 to 0.035
Silicon (Si), % 0 to 0.4
0.15 to 0.35
Sulfur (S), % 0 to 0.035
0 to 0.040