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SAE-AISI 9255 Steel vs. SAE-AISI M3 Class 1 Steel

Both SAE-AISI 9255 steel and SAE-AISI M3 class 1 steel are iron alloys. They have 81% 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 9255 steel and the bottom bar is SAE-AISI M3 class 1 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 72
77
Tensile Strength: Ultimate (UTS), MPa 680
770 to 2150

Thermal Properties

Latent Heat of Fusion, J/g 280
260
Melting Completion (Liquidus), °C 1430
1610
Melting Onset (Solidus), °C 1390
1570
Specific Heat Capacity, J/kg-K 480
440
Thermal Conductivity, W/m-K 46
26
Thermal Expansion, µm/m-K 13
12

Otherwise Unclassified Properties

Base Metal Price, % relative 2.0
25
Density, g/cm3 7.7
8.3
Embodied Carbon, kg CO2/kg material 1.5
10
Embodied Energy, MJ/kg 20
150
Embodied Water, L/kg 46
100

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 24
26 to 72
Strength to Weight: Bending, points 22
22 to 44
Thermal Diffusivity, mm2/s 13
7.2
Thermal Shock Resistance, points 21
24 to 67

Alloy Composition

Carbon (C), % 0.51 to 0.59
1.0 to 1.1
Chromium (Cr), % 0
3.8 to 4.5
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 96.2 to 97
76.9 to 82.9
Manganese (Mn), % 0.7 to 1.0
0.15 to 0.4
Molybdenum (Mo), % 0
4.8 to 6.5
Nickel (Ni), % 0
0 to 0.3
Phosphorus (P), % 0 to 0.035
0 to 0.030
Silicon (Si), % 1.8 to 2.2
0.2 to 0.45
Sulfur (S), % 0 to 0.040
0 to 0.030
Tungsten (W), % 0
5.0 to 6.8
Vanadium (V), % 0
2.3 to 2.8