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EN 1.7720 Steel vs. EN 1.6957 Steel

Both EN 1.7720 steel and EN 1.6957 steel are iron alloys. Both are furnished in the quenched and tempered condition. They have a very high 95% of their average alloy composition in common. There are 32 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 1.6957 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
280
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 19
18
Fatigue Strength, MPa 230
530
Impact Strength: V-Notched Charpy, J 30
71
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 590
930
Tensile Strength: Yield (Proof), MPa 340
780

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 410
450
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
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
7.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 2.8
5.0
Density, g/cm3 7.9
7.9
Embodied Carbon, kg CO2/kg material 2.2
2.1
Embodied Energy, MJ/kg 30
29
Embodied Water, L/kg 51
60

Common Calculations

PREN (Pitting Resistance) 2.1
2.7
Resilience: Ultimate (Unit Rupture Work), MJ/m3 97
160
Resilience: Unit (Modulus of Resilience), kJ/m3 300
1630
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 21
33
Strength to Weight: Bending, points 20
27
Thermal Diffusivity, mm2/s 11
13
Thermal Shock Resistance, points 17
27

Alloy Composition

Carbon (C), % 0.1 to 0.15
0.22 to 0.32
Chromium (Cr), % 0.3 to 0.5
1.2 to 1.8
Copper (Cu), % 0 to 0.3
0
Iron (Fe), % 96.6 to 98.6
92.7 to 94.7
Manganese (Mn), % 0.4 to 0.7
0.15 to 0.4
Molybdenum (Mo), % 0.4 to 0.6
0.25 to 0.45
Nickel (Ni), % 0 to 0.4
3.4 to 4.0
Phosphorus (P), % 0 to 0.030
0 to 0.010
Silicon (Si), % 0 to 0.45
0 to 0.15
Sulfur (S), % 0 to 0.020
0 to 0.0070
Vanadium (V), % 0.22 to 0.3
0.050 to 0.15