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SAE-AISI H12 Steel vs. R30556 Alloy

Both SAE-AISI H12 steel and R30556 alloy are iron alloys. They have a modest 38% 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 SAE-AISI H12 steel and the bottom bar is R30556 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 75
81
Tensile Strength: Ultimate (UTS), MPa 690 to 1850
780

Thermal Properties

Latent Heat of Fusion, J/g 270
300
Melting Completion (Liquidus), °C 1480
1420
Melting Onset (Solidus), °C 1440
1330
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 36
11
Thermal Expansion, µm/m-K 12
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.3
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 9.5
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
70
Density, g/cm3 7.9
8.4
Embodied Carbon, kg CO2/kg material 2.9
8.7
Embodied Energy, MJ/kg 41
130
Embodied Water, L/kg 76
300

Common Calculations

PREN (Pitting Resistance) 12
40
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 24 to 65
26
Strength to Weight: Bending, points 22 to 42
22
Thermal Diffusivity, mm2/s 9.8
2.9
Thermal Shock Resistance, points 22 to 60
18

Alloy Composition

Aluminum (Al), % 0
0.1 to 0.5
Boron (B), % 0
0 to 0.020
Carbon (C), % 0.3 to 0.4
0.050 to 0.15
Chromium (Cr), % 4.8 to 5.5
21 to 23
Cobalt (Co), % 0
16 to 21
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 87.8 to 91.7
20.4 to 38.2
Lanthanum (La), % 0
0.0050 to 0.1
Manganese (Mn), % 0.2 to 0.5
0.5 to 2.0
Molybdenum (Mo), % 1.3 to 1.8
2.5 to 4.0
Nickel (Ni), % 0 to 0.3
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), % 0.8 to 1.2
0.2 to 0.8
Sulfur (S), % 0 to 0.030
0 to 0.015
Tantalum (Ta), % 0
0.3 to 1.3
Tungsten (W), % 1.0 to 1.7
2.0 to 3.5
Vanadium (V), % 0 to 0.5
0
Zinc (Zn), % 0
0.0010 to 0.1