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Hardened AISI 440C vs. Hardened SAE-AISI M52

Both hardened AISI 440C and hardened SAE-AISI M52 are iron alloys. Both are furnished in the hardened (H) condition. They have 86% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is hardened AISI 440C and the bottom bar is hardened SAE-AISI M52.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
75
Tensile Strength: Ultimate (UTS), MPa 1970
2280

Thermal Properties

Latent Heat of Fusion, J/g 280
260
Melting Completion (Liquidus), °C 1480
1510
Melting Onset (Solidus), °C 1370
1470
Specific Heat Capacity, J/kg-K 480
460
Thermal Conductivity, W/m-K 22
31
Thermal Expansion, µm/m-K 10
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
8.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.8
10

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
12
Density, g/cm3 7.7
7.9
Embodied Carbon, kg CO2/kg material 2.2
7.5
Embodied Energy, MJ/kg 31
110
Embodied Water, L/kg 120
89

Common Calculations

PREN (Pitting Resistance) 18
20
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 71
80
Strength to Weight: Bending, points 46
49
Thermal Diffusivity, mm2/s 6.0
8.4
Thermal Shock Resistance, points 71
67

Alloy Composition

Carbon (C), % 1.0 to 1.2
0.85 to 1.0
Chromium (Cr), % 16 to 18
3.5 to 4.3
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 78 to 83.1
84.4 to 88.9
Manganese (Mn), % 0 to 1.0
0.15 to 0.45
Molybdenum (Mo), % 0 to 0.75
4.0 to 4.9
Nickel (Ni), % 0
0 to 0.3
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0 to 1.0
0.2 to 0.6
Sulfur (S), % 0 to 0.015
0 to 0.030
Tungsten (W), % 0
0.75 to 1.5
Vanadium (V), % 0
1.7 to 2.3