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SAE-AISI M4 Steel vs. SAE-AISI 9255 Steel

Both SAE-AISI M4 steel and SAE-AISI 9255 steel are iron alloys. They have 80% 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 M4 steel and the bottom bar is SAE-AISI 9255 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
72
Tensile Strength: Ultimate (UTS), MPa 770 to 2150
680

Thermal Properties

Latent Heat of Fusion, J/g 260
280
Melting Completion (Liquidus), °C 1610
1430
Melting Onset (Solidus), °C 1560
1390
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 25
46
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Base Metal Price, % relative 25
2.0
Density, g/cm3 8.3
7.7
Embodied Carbon, kg CO2/kg material 14
1.5
Embodied Energy, MJ/kg 210
20
Embodied Water, L/kg 110
46

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 26 to 72
24
Strength to Weight: Bending, points 23 to 45
22
Thermal Diffusivity, mm2/s 6.9
13
Thermal Shock Resistance, points 24 to 68
21

Alloy Composition

Carbon (C), % 1.3 to 1.4
0.51 to 0.59
Chromium (Cr), % 3.8 to 4.8
0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 75.9 to 81.4
96.2 to 97
Manganese (Mn), % 0.15 to 0.4
0.7 to 1.0
Molybdenum (Mo), % 4.3 to 5.5
0
Nickel (Ni), % 0 to 0.3
0
Phosphorus (P), % 0 to 0.030
0 to 0.035
Silicon (Si), % 0.2 to 0.45
1.8 to 2.2
Sulfur (S), % 0 to 0.030
0 to 0.040
Tungsten (W), % 5.3 to 6.5
0
Vanadium (V), % 3.8 to 4.5
0