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SAE-AISI M30 Steel vs. SAE-AISI M42 Steel

Both SAE-AISI M30 steel and SAE-AISI M42 steel are iron alloys. Their average alloy composition is basically identical.

For each property being compared, the top bar is SAE-AISI M30 steel and the bottom bar is SAE-AISI M42 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 78
78
Tensile Strength: Ultimate (UTS), MPa 800 to 2170
810 to 2310

Thermal Properties

Latent Heat of Fusion, J/g 270
270
Melting Completion (Liquidus), °C 1550
1540
Melting Onset (Solidus), °C 1500
1490
Specific Heat Capacity, J/kg-K 450
450
Thermal Conductivity, W/m-K 24
20
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 26
30
Density, g/cm3 8.2
8.2
Embodied Carbon, kg CO2/kg material 7.2
7.4
Embodied Energy, MJ/kg 100
100
Embodied Water, L/kg 120
140

Common Calculations

PREN (Pitting Resistance) 35
38
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 27 to 74
28 to 79
Strength to Weight: Bending, points 24 to 46
24 to 48
Thermal Diffusivity, mm2/s 6.6
5.4
Thermal Shock Resistance, points 25 to 67
25 to 71

Alloy Composition

Carbon (C), % 0.75 to 0.85
1.1 to 1.2
Chromium (Cr), % 3.5 to 4.3
3.5 to 4.3
Cobalt (Co), % 4.5 to 5.5
7.8 to 8.8
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 75.2 to 80.9
76.3 to 81
Manganese (Mn), % 0.15 to 0.4
0.15 to 0.4
Molybdenum (Mo), % 7.8 to 9.0
9.0 to 10
Nickel (Ni), % 0 to 0.3
0 to 0.3
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0.2 to 0.45
0.15 to 0.65
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 1.3 to 2.3
1.2 to 1.9
Vanadium (V), % 1.0 to 1.4
1.0 to 1.4

Comparable Variants