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Hardened SAE-AISI M3 Class 1 vs. Hardened SAE-AISI M50

Both hardened SAE-AISI M3 class 1 and hardened SAE-AISI M50 are iron alloys. Both are furnished in the hardened (H) condition. They have a moderately high 91% of their average alloy composition in common. There are 23 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 hardened SAE-AISI M3 class 1 and the bottom bar is hardened SAE-AISI M50.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.29
0.29
Rockwell C Hardness 66
70
Shear Modulus, GPa 77
75
Tensile Strength: Ultimate (UTS), MPa 2150
2250

Thermal Properties

Latent Heat of Fusion, J/g 260
260
Melting Completion (Liquidus), °C 1610
1480
Melting Onset (Solidus), °C 1570
1440
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 26
35
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Base Metal Price, % relative 25
9.0
Density, g/cm3 8.3
7.9
Embodied Carbon, kg CO2/kg material 10
5.1
Embodied Energy, MJ/kg 150
74
Embodied Water, L/kg 100
83

Common Calculations

PREN (Pitting Resistance) 33
19
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 72
80
Strength to Weight: Bending, points 44
49
Thermal Diffusivity, mm2/s 7.2
9.7
Thermal Shock Resistance, points 67
66

Alloy Composition

Carbon (C), % 1.0 to 1.1
0.78 to 0.88
Chromium (Cr), % 3.8 to 4.5
3.8 to 4.5
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 76.9 to 82.9
87 to 90.4
Manganese (Mn), % 0.15 to 0.4
0.15 to 0.45
Molybdenum (Mo), % 4.8 to 6.5
3.9 to 4.8
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
0.2 to 0.6
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 5.0 to 6.8
0
Vanadium (V), % 2.3 to 2.8
0.8 to 1.3