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Hardened SAE-AISI M46 vs. Hardened SAE-AISI M50

Both hardened SAE-AISI M46 and hardened SAE-AISI M50 are iron alloys. Both are furnished in the hardened (H) condition. They have 83% 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 M46 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 71
70
Shear Modulus, GPa 77
75
Tensile Strength: Ultimate (UTS), MPa 2300
2250

Thermal Properties

Latent Heat of Fusion, J/g 270
260
Melting Completion (Liquidus), °C 1540
1480
Melting Onset (Solidus), °C 1500
1440
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 18
35
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Base Metal Price, % relative 33
9.0
Density, g/cm3 8.1
7.9
Embodied Carbon, kg CO2/kg material 12
5.1
Embodied Energy, MJ/kg 180
74
Embodied Water, L/kg 150
83

Common Calculations

PREN (Pitting Resistance) 35
19
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 78
80
Strength to Weight: Bending, points 48
49
Thermal Diffusivity, mm2/s 4.9
9.7
Thermal Shock Resistance, points 71
66

Alloy Composition

Carbon (C), % 1.2 to 1.3
0.78 to 0.88
Chromium (Cr), % 3.7 to 4.2
3.8 to 4.5
Cobalt (Co), % 7.8 to 8.8
0
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 70 to 73.8
87 to 90.4
Manganese (Mn), % 0.2 to 0.4
0.15 to 0.45
Molybdenum (Mo), % 8.0 to 8.5
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), % 0.4 to 0.65
0.2 to 0.6
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 1.9 to 2.2
0
Vanadium (V), % 3.0 to 3.3
0.8 to 1.3