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SAE-AISI M42 Steel vs. SAE-AISI A9 Steel

Both SAE-AISI M42 steel and SAE-AISI A9 steel are iron alloys. They have 87% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (2, 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 A9 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
74
Tensile Strength: Ultimate (UTS), MPa 810 to 2310
770 to 2030

Thermal Properties

Latent Heat of Fusion, J/g 270
280
Melting Completion (Liquidus), °C 1540
1460
Melting Onset (Solidus), °C 1490
1410
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 20
35
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 30
7.0
Density, g/cm3 8.2
7.8
Embodied Carbon, kg CO2/kg material 7.4
4.7
Embodied Energy, MJ/kg 100
70
Embodied Water, L/kg 140
82

Common Calculations

PREN (Pitting Resistance) 38
10
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 28 to 79
28 to 73
Strength to Weight: Bending, points 24 to 48
24 to 46
Thermal Diffusivity, mm2/s 5.4
9.6
Thermal Shock Resistance, points 25 to 71
25 to 66

Alloy Composition

Carbon (C), % 1.1 to 1.2
0.45 to 0.55
Chromium (Cr), % 3.5 to 4.3
4.8 to 5.5
Cobalt (Co), % 7.8 to 8.8
0
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 76.3 to 81
87 to 90.5
Manganese (Mn), % 0.15 to 0.4
0 to 0.5
Molybdenum (Mo), % 9.0 to 10
1.3 to 1.8
Nickel (Ni), % 0 to 0.3
1.3 to 1.8
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0.15 to 0.65
1.0 to 1.2
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 1.2 to 1.9
0
Vanadium (V), % 1.0 to 1.4
0.8 to 1.4

Comparable Variants