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Hardened SAE-AISI M2 vs. Hardened SAE-AISI P20

Both hardened SAE-AISI M2 and hardened SAE-AISI P20 are iron alloys. Both are furnished in the hardened (H) condition. They have 84% 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 M2 and the bottom bar is hardened SAE-AISI P20.

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
33
Shear Modulus, GPa 77
73
Tensile Strength: Ultimate (UTS), MPa 2150
1050

Thermal Properties

Latent Heat of Fusion, J/g 260
260
Melting Completion (Liquidus), °C 1610
1460
Melting Onset (Solidus), °C 1570
1420
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 22
45
Thermal Expansion, µm/m-K 10
12

Otherwise Unclassified Properties

Base Metal Price, % relative 24
2.8
Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.8
1.6
Embodied Energy, MJ/kg 130
21
Embodied Water, L/kg 98
52

Common Calculations

PREN (Pitting Resistance) 31
2.6
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 71
37
Strength to Weight: Bending, points 44
29
Thermal Diffusivity, mm2/s 5.9
12
Thermal Shock Resistance, points 76
35

Alloy Composition

Carbon (C), % 0.78 to 1.1
0.28 to 0.4
Chromium (Cr), % 3.8 to 4.5
0.4 to 2.0
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 78.5 to 83.4
95.2 to 98.5
Manganese (Mn), % 0.15 to 0.4
0.35 to 0.71
Molybdenum (Mo), % 4.5 to 5.5
0.3 to 0.55
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 0.8
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 5.5 to 6.8
0
Vanadium (V), % 1.8 to 2.2
0