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EN 1.7720 Steel vs. EN 1.8870 Steel

Both EN 1.7720 steel and EN 1.8870 steel are iron alloys. Both are furnished in the quenched and tempered condition. Their average alloy composition is basically identical. 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 1.8870 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
180
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 19
21
Fatigue Strength, MPa 230
310
Impact Strength: V-Notched Charpy, J 30
67
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 590
610
Tensile Strength: Yield (Proof), MPa 340
450

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 410
410
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
39
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
7.5
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 2.8
2.8
Density, g/cm3 7.9
7.9
Embodied Carbon, kg CO2/kg material 2.2
1.7
Embodied Energy, MJ/kg 30
22
Embodied Water, L/kg 51
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 97
120
Resilience: Unit (Modulus of Resilience), kJ/m3 300
530
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 21
22
Strength to Weight: Bending, points 20
20
Thermal Diffusivity, mm2/s 11
10
Thermal Shock Resistance, points 17
18

Alloy Composition

Boron (B), % 0
0 to 0.0050
Carbon (C), % 0.1 to 0.15
0 to 0.18
Chromium (Cr), % 0.3 to 0.5
0 to 0.5
Copper (Cu), % 0 to 0.3
0 to 0.3
Iron (Fe), % 96.6 to 98.6
95.1 to 100
Manganese (Mn), % 0.4 to 0.7
0 to 1.7
Molybdenum (Mo), % 0.4 to 0.6
0 to 0.5
Nickel (Ni), % 0 to 0.4
0 to 1.0
Niobium (Nb), % 0
0 to 0.050
Nitrogen (N), % 0
0 to 0.015
Phosphorus (P), % 0 to 0.030
0 to 0.025
Silicon (Si), % 0 to 0.45
0 to 0.5
Sulfur (S), % 0 to 0.020
0 to 0.010
Titanium (Ti), % 0
0 to 0.030
Vanadium (V), % 0.22 to 0.3
0 to 0.080
Zirconium (Zr), % 0
0 to 0.050