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EN 1.7720 Steel vs. R30556 Alloy

Both EN 1.7720 steel and R30556 alloy are iron alloys. They have a modest 31% of their average alloy composition in common, which, by itself, doesn't mean much. There are 30 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is EN 1.7720 steel and the bottom bar is R30556 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 19
45
Fatigue Strength, MPa 230
320
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
81
Tensile Strength: Ultimate (UTS), MPa 590
780
Tensile Strength: Yield (Proof), MPa 340
350

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Maximum Temperature: Mechanical, °C 410
1100
Melting Completion (Liquidus), °C 1470
1420
Melting Onset (Solidus), °C 1430
1330
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 40
11
Thermal Expansion, µm/m-K 13
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 2.8
70
Density, g/cm3 7.9
8.4
Embodied Carbon, kg CO2/kg material 2.2
8.7
Embodied Energy, MJ/kg 30
130
Embodied Water, L/kg 51
300

Common Calculations

PREN (Pitting Resistance) 2.1
40
Resilience: Ultimate (Unit Rupture Work), MJ/m3 97
290
Resilience: Unit (Modulus of Resilience), kJ/m3 300
290
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 21
26
Strength to Weight: Bending, points 20
22
Thermal Diffusivity, mm2/s 11
2.9
Thermal Shock Resistance, points 17
18

Alloy Composition

Aluminum (Al), % 0
0.1 to 0.5
Boron (B), % 0
0 to 0.020
Carbon (C), % 0.1 to 0.15
0.050 to 0.15
Chromium (Cr), % 0.3 to 0.5
21 to 23
Cobalt (Co), % 0
16 to 21
Copper (Cu), % 0 to 0.3
0
Iron (Fe), % 96.6 to 98.6
20.4 to 38.2
Lanthanum (La), % 0
0.0050 to 0.1
Manganese (Mn), % 0.4 to 0.7
0.5 to 2.0
Molybdenum (Mo), % 0.4 to 0.6
2.5 to 4.0
Nickel (Ni), % 0 to 0.4
19 to 22.5
Niobium (Nb), % 0
0 to 0.3
Nitrogen (N), % 0
0.1 to 0.3
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0 to 0.45
0.2 to 0.8
Sulfur (S), % 0 to 0.020
0 to 0.015
Tantalum (Ta), % 0
0.3 to 1.3
Tungsten (W), % 0
2.0 to 3.5
Vanadium (V), % 0.22 to 0.3
0
Zinc (Zn), % 0
0.0010 to 0.1