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SAE-AISI 8645 Steel vs. SAE-AISI M44 Steel

Both SAE-AISI 8645 steel and SAE-AISI M44 steel are iron alloys. They have 70% of their average alloy composition in common. There are 21 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 8645 steel and the bottom bar is SAE-AISI M44 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
78
Tensile Strength: Ultimate (UTS), MPa 600 to 670
870 to 2290

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Melting Completion (Liquidus), °C 1460
1590
Melting Onset (Solidus), °C 1420
1540
Specific Heat Capacity, J/kg-K 470
440
Thermal Conductivity, W/m-K 39
14
Thermal Expansion, µm/m-K 13
12

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
43
Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 1.5
9.9
Embodied Energy, MJ/kg 20
150
Embodied Water, L/kg 50
170

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 21 to 24
28 to 75
Strength to Weight: Bending, points 20 to 22
24 to 46
Thermal Diffusivity, mm2/s 10
3.7
Thermal Shock Resistance, points 18 to 20
27 to 70

Alloy Composition

Carbon (C), % 0.43 to 0.48
1.1 to 1.2
Chromium (Cr), % 0.4 to 0.6
4.0 to 4.8
Cobalt (Co), % 0
11 to 12.3
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 96.5 to 97.7
65.3 to 70.6
Manganese (Mn), % 0.75 to 1.0
0.2 to 0.4
Molybdenum (Mo), % 0.15 to 0.25
6.0 to 7.0
Nickel (Ni), % 0.4 to 0.7
0 to 0.3
Phosphorus (P), % 0 to 0.035
0 to 0.030
Silicon (Si), % 0.15 to 0.35
0.3 to 0.55
Sulfur (S), % 0 to 0.040
0 to 0.030
Tungsten (W), % 0
5.0 to 5.8
Vanadium (V), % 0
1.9 to 2.2

Comparable Variants