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SAE-AISI 4621 Steel vs. SAE-AISI M7 Steel

Both SAE-AISI 4621 steel and SAE-AISI M7 steel are iron alloys. They have 83% 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 4621 steel and the bottom bar is SAE-AISI M7 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
77
Tensile Strength: Ultimate (UTS), MPa 500
760 to 2210

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Melting Completion (Liquidus), °C 1460
1560
Melting Onset (Solidus), °C 1420
1510
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 46
28
Thermal Expansion, µm/m-K 13
12

Otherwise Unclassified Properties

Base Metal Price, % relative 3.3
18
Density, g/cm3 7.9
8.1
Embodied Carbon, kg CO2/kg material 1.6
8.9
Embodied Energy, MJ/kg 22
130
Embodied Water, L/kg 50
100

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 18
26 to 76
Strength to Weight: Bending, points 18
23 to 47
Thermal Diffusivity, mm2/s 12
7.8
Thermal Shock Resistance, points 15
24 to 69

Alloy Composition

Carbon (C), % 0.18 to 0.23
1.0 to 1.1
Chromium (Cr), % 0
3.5 to 4.0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 96.1 to 97.1
79.8 to 83.8
Manganese (Mn), % 0.7 to 0.9
0.15 to 0.4
Molybdenum (Mo), % 0.2 to 0.3
8.2 to 9.2
Nickel (Ni), % 1.7 to 2.0
0 to 0.3
Phosphorus (P), % 0 to 0.035
0 to 0.030
Silicon (Si), % 0.15 to 0.35
0.2 to 0.55
Sulfur (S), % 0 to 0.040
0 to 0.030
Tungsten (W), % 0
1.4 to 2.1
Vanadium (V), % 0
1.8 to 2.3