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R30556 Alloy vs. SAE-AISI O7 Steel

Both R30556 alloy and SAE-AISI O7 steel are iron alloys. They have a modest 33% of their average alloy composition in common, which, by itself, doesn't mean much. There are 24 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is R30556 alloy and the bottom bar is SAE-AISI O7 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 81
73
Tensile Strength: Ultimate (UTS), MPa 780
680 to 2110

Thermal Properties

Latent Heat of Fusion, J/g 300
250
Melting Completion (Liquidus), °C 1420
1480
Melting Onset (Solidus), °C 1330
1430
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 11
41
Thermal Expansion, µm/m-K 15
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 1.9
8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 70
6.0
Density, g/cm3 8.4
7.9
Embodied Carbon, kg CO2/kg material 8.7
2.3
Embodied Energy, MJ/kg 130
33
Embodied Water, L/kg 300
52

Common Calculations

PREN (Pitting Resistance) 40
3.6
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 26
24 to 74
Strength to Weight: Bending, points 22
22 to 46
Thermal Diffusivity, mm2/s 2.9
11
Thermal Shock Resistance, points 18
23 to 70

Alloy Composition

Aluminum (Al), % 0.1 to 0.5
0
Boron (B), % 0 to 0.020
0
Carbon (C), % 0.050 to 0.15
1.1 to 1.3
Chromium (Cr), % 21 to 23
0.35 to 0.85
Cobalt (Co), % 16 to 21
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 20.4 to 38.2
92.9 to 97.6
Lanthanum (La), % 0.0050 to 0.1
0
Manganese (Mn), % 0.5 to 2.0
0 to 1.0
Molybdenum (Mo), % 2.5 to 4.0
0 to 0.3
Nickel (Ni), % 19 to 22.5
0 to 0.3
Niobium (Nb), % 0 to 0.3
0
Nitrogen (N), % 0.1 to 0.3
0
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0.2 to 0.8
0 to 0.6
Sulfur (S), % 0 to 0.015
0 to 0.030
Tantalum (Ta), % 0.3 to 1.3
0
Tungsten (W), % 2.0 to 3.5
1.0 to 2.0
Vanadium (V), % 0
0 to 0.4
Zinc (Zn), % 0.0010 to 0.1
0