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EN 1.7720 Steel vs. EN 1.0644 Steel

Both EN 1.7720 steel and EN 1.0644 steel are iron alloys. Both are furnished in the quenched and tempered condition. They have a very high 99% 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 1.7720 steel and the bottom bar is EN 1.0644 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
200
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 19
17
Fatigue Strength, MPa 230
380
Impact Strength: V-Notched Charpy, J 30
38
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 590
690
Tensile Strength: Yield (Proof), MPa 340
570

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 410
400
Melting Completion (Liquidus), °C 1470
1460
Melting Onset (Solidus), °C 1430
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 40
47
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
8.5

Otherwise Unclassified Properties

Base Metal Price, % relative 2.8
2.4
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 2.2
1.8
Embodied Energy, MJ/kg 30
24
Embodied Water, L/kg 51
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 97
110
Resilience: Unit (Modulus of Resilience), kJ/m3 300
870
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 21
24
Strength to Weight: Bending, points 20
22
Thermal Diffusivity, mm2/s 11
13
Thermal Shock Resistance, points 17
22

Alloy Composition

Aluminum (Al), % 0
0.010 to 0.050
Carbon (C), % 0.1 to 0.15
0.16 to 0.22
Chromium (Cr), % 0.3 to 0.5
0 to 0.3
Copper (Cu), % 0 to 0.3
0 to 0.3
Iron (Fe), % 96.6 to 98.6
96.1 to 98.4
Manganese (Mn), % 0.4 to 0.7
1.3 to 1.7
Molybdenum (Mo), % 0.4 to 0.6
0 to 0.080
Nickel (Ni), % 0 to 0.4
0 to 0.4
Niobium (Nb), % 0
0 to 0.070
Nitrogen (N), % 0
0 to 0.020
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0 to 0.45
0.1 to 0.5
Sulfur (S), % 0 to 0.020
0 to 0.035
Titanium (Ti), % 0
0 to 0.050
Vanadium (V), % 0.22 to 0.3
0.080 to 0.15