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SAE-AISI M3 Class 2 Steel vs. SAE-AISI M6 Steel

Both SAE-AISI M3 class 2 steel and SAE-AISI M6 steel are iron alloys. They have 88% of their average alloy composition in common.

For each property being compared, the top bar is SAE-AISI M3 class 2 steel and the bottom bar is SAE-AISI M6 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 77
77
Tensile Strength: Ultimate (UTS), MPa 770 to 2210
840 to 2210

Thermal Properties

Latent Heat of Fusion, J/g 260
260
Melting Completion (Liquidus), °C 1620
1560
Melting Onset (Solidus), °C 1570
1510
Specific Heat Capacity, J/kg-K 440
440
Thermal Conductivity, W/m-K 26
17
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 25
39
Density, g/cm3 8.3
8.4
Embodied Carbon, kg CO2/kg material 12
8.0
Embodied Energy, MJ/kg 180
120
Embodied Water, L/kg 110
160

Common Calculations

PREN (Pitting Resistance) 33
28
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 23
23
Strength to Weight: Axial, points 26 to 74
28 to 73
Strength to Weight: Bending, points 22 to 45
24 to 45
Thermal Diffusivity, mm2/s 7.2
4.7
Thermal Shock Resistance, points 24 to 69
26 to 68

Alloy Composition

Carbon (C), % 1.2 to 1.3
0.75 to 0.85
Chromium (Cr), % 3.8 to 4.5
3.8 to 4.5
Cobalt (Co), % 0
11 to 13
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 75.8 to 82.3
68.8 to 74.6
Manganese (Mn), % 0.15 to 0.4
0.15 to 0.4
Molybdenum (Mo), % 4.8 to 6.5
4.5 to 5.5
Nickel (Ni), % 0 to 0.3
0
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0.2 to 0.45
0.2 to 0.45
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 5.0 to 6.8
3.8 to 4.8
Vanadium (V), % 2.8 to 3.8
1.3 to 1.7

Comparable Variants