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SAE-AISI M4 Steel vs. SAE-AISI A8 Steel

Both SAE-AISI M4 steel and SAE-AISI A8 steel are iron alloys. They have 87% of their average alloy composition in common. There are 22 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 SAE-AISI M4 steel and the bottom bar is SAE-AISI A8 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 76
74
Tensile Strength: Ultimate (UTS), MPa 770 to 2150
700 to 1920

Thermal Properties

Latent Heat of Fusion, J/g 260
270
Melting Completion (Liquidus), °C 1610
1480
Melting Onset (Solidus), °C 1560
1430
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 25
37
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 25
8.5
Density, g/cm3 8.3
7.9
Embodied Carbon, kg CO2/kg material 14
2.3
Embodied Energy, MJ/kg 210
31
Embodied Water, L/kg 110
73

Common Calculations

PREN (Pitting Resistance) 30
12
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 26 to 72
25 to 68
Strength to Weight: Bending, points 23 to 45
22 to 44
Thermal Diffusivity, mm2/s 6.9
9.9
Thermal Shock Resistance, points 24 to 68
22 to 62

Alloy Composition

Carbon (C), % 1.3 to 1.4
0.5 to 0.6
Chromium (Cr), % 3.8 to 4.8
4.8 to 5.5
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 75.9 to 81.4
88.5 to 91.9
Manganese (Mn), % 0.15 to 0.4
0 to 0.5
Molybdenum (Mo), % 4.3 to 5.5
1.2 to 1.7
Nickel (Ni), % 0 to 0.3
0 to 0.3
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0.2 to 0.45
0.75 to 1.1
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 5.3 to 6.5
1.0 to 1.5
Vanadium (V), % 3.8 to 4.5
0

Comparable Variants