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R30556 Alloy vs. SAE-AISI P21 Steel

Both R30556 alloy and SAE-AISI P21 steel are iron alloys. They have a modest 36% of their average alloy composition in common, which, by itself, doesn't mean much. There are 23 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is R30556 alloy and the bottom bar is SAE-AISI P21 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
1130

Thermal Properties

Latent Heat of Fusion, J/g 300
250
Melting Completion (Liquidus), °C 1420
1450
Melting Onset (Solidus), °C 1330
1410
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
7.9
Electrical Conductivity: Equal Weight (Specific), % IACS 1.9
9.0

Otherwise Unclassified Properties

Base Metal Price, % relative 70
6.5
Density, g/cm3 8.4
7.9
Embodied Carbon, kg CO2/kg material 8.7
2.3
Embodied Energy, MJ/kg 130
32
Embodied Water, L/kg 300
62

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 26
40
Strength to Weight: Bending, points 22
31
Thermal Diffusivity, mm2/s 2.9
11
Thermal Shock Resistance, points 18
37

Alloy Composition

Aluminum (Al), % 0.1 to 0.5
0
Boron (B), % 0 to 0.020
0
Carbon (C), % 0.050 to 0.15
0.18 to 0.22
Chromium (Cr), % 21 to 23
0 to 0.5
Cobalt (Co), % 16 to 21
1.1 to 1.3
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 20.4 to 38.2
92.1 to 94.2
Lanthanum (La), % 0.0050 to 0.1
0
Manganese (Mn), % 0.5 to 2.0
0.35 to 0.72
Molybdenum (Mo), % 2.5 to 4.0
0
Nickel (Ni), % 19 to 22.5
3.9 to 4.3
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
0.2 to 0.4
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
0
Vanadium (V), % 0
0.15 to 0.25
Zinc (Zn), % 0.0010 to 0.1
0