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SAE-AISI S7 Steel vs. EN 1.7779 Steel

Both SAE-AISI S7 steel and EN 1.7779 steel are iron alloys. They have a very high 98% 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 S7 steel and the bottom bar is EN 1.7779 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 74
73
Tensile Strength: Ultimate (UTS), MPa 670 to 2030
810

Thermal Properties

Latent Heat of Fusion, J/g 260
260
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 40
39
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
7.7
Electrical Conductivity: Equal Weight (Specific), % IACS 9.0
8.9

Otherwise Unclassified Properties

Base Metal Price, % relative 5.0
4.0
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.3
2.8
Embodied Energy, MJ/kg 31
41
Embodied Water, L/kg 65
64

Common Calculations

PREN (Pitting Resistance) 8.4
5.0
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 24 to 72
29
Strength to Weight: Bending, points 22 to 46
25
Thermal Diffusivity, mm2/s 11
11
Thermal Shock Resistance, points 22 to 66
23

Alloy Composition

Aluminum (Al), % 0
0 to 0.040
Carbon (C), % 0.45 to 0.55
0.17 to 0.23
Chromium (Cr), % 3.0 to 3.5
3.0 to 3.3
Copper (Cu), % 0 to 0.25
0 to 0.3
Iron (Fe), % 91.6 to 94.9
93.8 to 95.4
Manganese (Mn), % 0.2 to 0.9
0.3 to 0.5
Molybdenum (Mo), % 1.3 to 1.8
0.5 to 0.6
Nickel (Ni), % 0
0 to 0.3
Phosphorus (P), % 0 to 0.030
0 to 0.025
Silicon (Si), % 0.2 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.010
Vanadium (V), % 0 to 0.3
0.45 to 0.55