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SAE-AISI O7 Steel vs. EN 1.8550 Steel

Both SAE-AISI O7 steel and EN 1.8550 steel are iron alloys. They have a very high 97% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI O7 steel and the bottom bar is EN 1.8550 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 680 to 2110
1000

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Melting Completion (Liquidus), °C 1480
1450
Melting Onset (Solidus), °C 1430
1410
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 41
40
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 8.7
8.8

Otherwise Unclassified Properties

Base Metal Price, % relative 6.0
3.4
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 2.3
1.7
Embodied Energy, MJ/kg 33
23
Embodied Water, L/kg 52
67

Common Calculations

PREN (Pitting Resistance) 3.6
2.3
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 24 to 74
36
Strength to Weight: Bending, points 22 to 46
29
Thermal Diffusivity, mm2/s 11
11
Thermal Shock Resistance, points 23 to 70
29

Alloy Composition

Aluminum (Al), % 0
0.8 to 1.2
Carbon (C), % 1.1 to 1.3
0.3 to 0.37
Chromium (Cr), % 0.35 to 0.85
1.5 to 1.8
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 92.9 to 97.6
94.4 to 96.3
Manganese (Mn), % 0 to 1.0
0.4 to 0.7
Molybdenum (Mo), % 0 to 0.3
0.15 to 0.25
Nickel (Ni), % 0 to 0.3
0.85 to 1.2
Phosphorus (P), % 0 to 0.030
0 to 0.025
Silicon (Si), % 0 to 0.6
0 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.035
Tungsten (W), % 1.0 to 2.0
0
Vanadium (V), % 0 to 0.4
0