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SAE-AISI S7 Steel vs. SAE-AISI M3 Class 1 Steel

Both SAE-AISI S7 steel and SAE-AISI M3 class 1 steel are iron alloys. They have 86% 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 M3 class 1 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
77
Tensile Strength: Ultimate (UTS), MPa 670 to 2030
770 to 2150

Thermal Properties

Latent Heat of Fusion, J/g 260
260
Melting Completion (Liquidus), °C 1460
1610
Melting Onset (Solidus), °C 1420
1570
Specific Heat Capacity, J/kg-K 470
440
Thermal Conductivity, W/m-K 40
26
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 5.0
25
Density, g/cm3 7.8
8.3
Embodied Carbon, kg CO2/kg material 2.3
10
Embodied Energy, MJ/kg 31
150
Embodied Water, L/kg 65
100

Common Calculations

PREN (Pitting Resistance) 8.4
33
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 24 to 72
26 to 72
Strength to Weight: Bending, points 22 to 46
22 to 44
Thermal Diffusivity, mm2/s 11
7.2
Thermal Shock Resistance, points 22 to 66
24 to 67

Alloy Composition

Carbon (C), % 0.45 to 0.55
1.0 to 1.1
Chromium (Cr), % 3.0 to 3.5
3.8 to 4.5
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 91.6 to 94.9
76.9 to 82.9
Manganese (Mn), % 0.2 to 0.9
0.15 to 0.4
Molybdenum (Mo), % 1.3 to 1.8
4.8 to 6.5
Nickel (Ni), % 0
0 to 0.3
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0.2 to 1.0
0.2 to 0.45
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 0
5.0 to 6.8
Vanadium (V), % 0 to 0.3
2.3 to 2.8

Comparable Variants