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SAE-AISI M42 Steel vs. R30556 Alloy

Both SAE-AISI M42 steel and R30556 alloy are iron alloys. They have 47% of their average alloy composition in common. There are 22 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 SAE-AISI M42 steel and the bottom bar is R30556 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 78
81
Tensile Strength: Ultimate (UTS), MPa 810 to 2310
780

Thermal Properties

Latent Heat of Fusion, J/g 270
300
Melting Completion (Liquidus), °C 1540
1420
Melting Onset (Solidus), °C 1490
1330
Specific Heat Capacity, J/kg-K 450
450
Thermal Conductivity, W/m-K 20
11
Thermal Expansion, µm/m-K 12
15

Otherwise Unclassified Properties

Base Metal Price, % relative 30
70
Density, g/cm3 8.2
8.4
Embodied Carbon, kg CO2/kg material 7.4
8.7
Embodied Energy, MJ/kg 100
130
Embodied Water, L/kg 140
300

Common Calculations

PREN (Pitting Resistance) 38
40
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 28 to 79
26
Strength to Weight: Bending, points 24 to 48
22
Thermal Diffusivity, mm2/s 5.4
2.9
Thermal Shock Resistance, points 25 to 71
18

Alloy Composition

Aluminum (Al), % 0
0.1 to 0.5
Boron (B), % 0
0 to 0.020
Carbon (C), % 1.1 to 1.2
0.050 to 0.15
Chromium (Cr), % 3.5 to 4.3
21 to 23
Cobalt (Co), % 7.8 to 8.8
16 to 21
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 76.3 to 81
20.4 to 38.2
Lanthanum (La), % 0
0.0050 to 0.1
Manganese (Mn), % 0.15 to 0.4
0.5 to 2.0
Molybdenum (Mo), % 9.0 to 10
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), % 0.15 to 0.65
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), % 1.2 to 1.9
2.0 to 3.5
Vanadium (V), % 1.0 to 1.4
0
Zinc (Zn), % 0
0.0010 to 0.1