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SAE-AISI S7 Steel vs. SAE-AISI M42 Steel

Both SAE-AISI S7 steel and SAE-AISI M42 steel are iron alloys. They have 85% 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 S7 steel and the bottom bar is SAE-AISI M42 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
78
Tensile Strength: Ultimate (UTS), MPa 670 to 2030
810 to 2310

Thermal Properties

Latent Heat of Fusion, J/g 260
270
Melting Completion (Liquidus), °C 1460
1540
Melting Onset (Solidus), °C 1420
1490
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 40
20
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 5.0
30
Density, g/cm3 7.8
8.2
Embodied Carbon, kg CO2/kg material 2.3
7.4
Embodied Energy, MJ/kg 31
100
Embodied Water, L/kg 65
140

Common Calculations

PREN (Pitting Resistance) 8.4
38
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 24 to 72
28 to 79
Strength to Weight: Bending, points 22 to 46
24 to 48
Thermal Diffusivity, mm2/s 11
5.4
Thermal Shock Resistance, points 22 to 66
25 to 71

Alloy Composition

Carbon (C), % 0.45 to 0.55
1.1 to 1.2
Chromium (Cr), % 3.0 to 3.5
3.5 to 4.3
Cobalt (Co), % 0
7.8 to 8.8
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 91.6 to 94.9
76.3 to 81
Manganese (Mn), % 0.2 to 0.9
0.15 to 0.4
Molybdenum (Mo), % 1.3 to 1.8
9.0 to 10
Nickel (Ni), % 0
0 to 0.3
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0.2 to 1.0
0.15 to 0.65
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 0
1.2 to 1.9
Vanadium (V), % 0 to 0.3
1.0 to 1.4

Comparable Variants