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SAE-AISI M42 Steel vs. SAE-AISI 4320 Steel

Both SAE-AISI M42 steel and SAE-AISI 4320 steel are iron alloys. They have 80% of their average alloy composition in common. There are 21 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI M42 steel and the bottom bar is SAE-AISI 4320 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 78
73
Tensile Strength: Ultimate (UTS), MPa 810 to 2310
570 to 790

Thermal Properties

Latent Heat of Fusion, J/g 270
250
Melting Completion (Liquidus), °C 1540
1460
Melting Onset (Solidus), °C 1490
1420
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 20
46
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Base Metal Price, % relative 30
3.4
Density, g/cm3 8.2
7.9
Embodied Carbon, kg CO2/kg material 7.4
1.7
Embodied Energy, MJ/kg 100
22
Embodied Water, L/kg 140
52

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 28 to 79
20 to 28
Strength to Weight: Bending, points 24 to 48
19 to 24
Thermal Diffusivity, mm2/s 5.4
13
Thermal Shock Resistance, points 25 to 71
19 to 27

Alloy Composition

Carbon (C), % 1.1 to 1.2
0.17 to 0.22
Chromium (Cr), % 3.5 to 4.3
0.4 to 0.6
Cobalt (Co), % 7.8 to 8.8
0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 76.3 to 81
95.8 to 97
Manganese (Mn), % 0.15 to 0.4
0.45 to 0.65
Molybdenum (Mo), % 9.0 to 10
0.2 to 0.3
Nickel (Ni), % 0 to 0.3
1.7 to 2.0
Phosphorus (P), % 0 to 0.030
0 to 0.035
Silicon (Si), % 0.15 to 0.65
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040
Tungsten (W), % 1.2 to 1.9
0
Vanadium (V), % 1.0 to 1.4
0

Comparable Variants