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EN 1.3961 Alloy vs. EN 1.7779 Steel

Both EN 1.3961 alloy and EN 1.7779 steel are iron alloys. Both are furnished in the quenched and tempered condition. They have 64% 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 EN 1.3961 alloy and the bottom bar is EN 1.7779 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 31
16
Poisson's Ratio 0.3
0.29
Shear Modulus, GPa 72
73
Shear Strength, MPa 300
500
Tensile Strength: Ultimate (UTS), MPa 450
810
Tensile Strength: Yield (Proof), MPa 310
660

Thermal Properties

Latent Heat of Fusion, J/g 270
260
Melting Completion (Liquidus), °C 1430
1460
Melting Onset (Solidus), °C 1390
1420
Specific Heat Capacity, J/kg-K 460
470
Thermal Expansion, µm/m-K 1.3
13

Otherwise Unclassified Properties

Base Metal Price, % relative 25
4.0
Density, g/cm3 8.2
7.8
Embodied Carbon, kg CO2/kg material 4.8
2.8
Embodied Energy, MJ/kg 66
41
Embodied Water, L/kg 110
64

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
120
Resilience: Unit (Modulus of Resilience), kJ/m3 250
1150
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 15
29
Strength to Weight: Bending, points 16
25
Thermal Shock Resistance, points 130
23

Alloy Composition

Aluminum (Al), % 0
0 to 0.040
Carbon (C), % 0 to 0.050
0.17 to 0.23
Chromium (Cr), % 0 to 0.25
3.0 to 3.3
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 60.7 to 65
93.8 to 95.4
Manganese (Mn), % 0 to 0.5
0.3 to 0.5
Molybdenum (Mo), % 0 to 1.0
0.5 to 0.6
Nickel (Ni), % 35 to 37
0 to 0.3
Phosphorus (P), % 0 to 0.030
0 to 0.025
Silicon (Si), % 0 to 0.5
0.15 to 0.35
Sulfur (S), % 0 to 0.020
0 to 0.010
Vanadium (V), % 0
0.45 to 0.55