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SAE-AISI D7 Steel vs. SAE-AISI 9255 Steel

Both SAE-AISI D7 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 D7 steel and the bottom bar is SAE-AISI 9255 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 73
72
Tensile Strength: Ultimate (UTS), MPa 800 to 2120
680

Thermal Properties

Latent Heat of Fusion, J/g 270
280
Melting Completion (Liquidus), °C 1440
1430
Melting Onset (Solidus), °C 1400
1390
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 27
46
Thermal Expansion, µm/m-K 11
13

Otherwise Unclassified Properties

Base Metal Price, % relative 10
2.0
Density, g/cm3 7.6
7.7
Embodied Carbon, kg CO2/kg material 11
1.5
Embodied Energy, MJ/kg 180
20
Embodied Water, L/kg 130
46

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 29 to 78
24
Strength to Weight: Bending, points 25 to 48
22
Thermal Diffusivity, mm2/s 7.4
13
Thermal Shock Resistance, points 27 to 72
21

Alloy Composition

Carbon (C), % 2.2 to 2.5
0.51 to 0.59
Chromium (Cr), % 11.5 to 13.5
0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 76.6 to 81.9
96.2 to 97
Manganese (Mn), % 0 to 0.6
0.7 to 1.0
Molybdenum (Mo), % 0.7 to 1.2
0
Nickel (Ni), % 0 to 0.3
0
Phosphorus (P), % 0 to 0.030
0 to 0.035
Silicon (Si), % 0 to 0.6
1.8 to 2.2
Sulfur (S), % 0 to 0.030
0 to 0.040
Vanadium (V), % 3.8 to 4.4
0