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SAE-AISI 1055 Steel vs. R30556 Alloy

Both SAE-AISI 1055 steel and R30556 alloy are iron alloys. They have a modest 30% 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 SAE-AISI 1055 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, % 11 to 14
45
Fatigue Strength, MPa 260 to 390
320
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
81
Shear Strength, MPa 440 to 450
550
Tensile Strength: Ultimate (UTS), MPa 730 to 750
780
Tensile Strength: Yield (Proof), MPa 400 to 630
350

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Maximum Temperature: Mechanical, °C 400
1100
Melting Completion (Liquidus), °C 1460
1420
Melting Onset (Solidus), °C 1420
1330
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 51
11
Thermal Expansion, µm/m-K 12
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 12
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
70
Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 1.4
8.7
Embodied Energy, MJ/kg 18
130
Embodied Water, L/kg 46
300

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 80 to 85
290
Resilience: Unit (Modulus of Resilience), kJ/m3 440 to 1070
290
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 26
26
Strength to Weight: Bending, points 23
22
Thermal Diffusivity, mm2/s 14
2.9
Thermal Shock Resistance, points 23 to 24
18

Alloy Composition

Aluminum (Al), % 0
0.1 to 0.5
Boron (B), % 0
0 to 0.020
Carbon (C), % 0.5 to 0.6
0.050 to 0.15
Chromium (Cr), % 0
21 to 23
Cobalt (Co), % 0
16 to 21
Iron (Fe), % 98.4 to 98.9
20.4 to 38.2
Lanthanum (La), % 0
0.0050 to 0.1
Manganese (Mn), % 0.6 to 0.9
0.5 to 2.0
Molybdenum (Mo), % 0
2.5 to 4.0
Nickel (Ni), % 0
19 to 22.5
Niobium (Nb), % 0
0 to 0.3
Nitrogen (N), % 0
0.1 to 0.3
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0
0.2 to 0.8
Sulfur (S), % 0 to 0.050
0 to 0.015
Tantalum (Ta), % 0
0.3 to 1.3
Tungsten (W), % 0
2.0 to 3.5
Zinc (Zn), % 0
0.0010 to 0.1