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SAE-AISI D7 Steel vs. SAE-AISI 1078 Steel

Both SAE-AISI D7 steel and SAE-AISI 1078 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 (12, 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 1078 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
730 to 780

Thermal Properties

Latent Heat of Fusion, J/g 270
250
Melting Completion (Liquidus), °C 1440
1460
Melting Onset (Solidus), °C 1400
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 27
49
Thermal Expansion, µm/m-K 11
11

Otherwise Unclassified Properties

Base Metal Price, % relative 10
1.8
Density, g/cm3 7.6
7.8
Embodied Carbon, kg CO2/kg material 11
1.4
Embodied Energy, MJ/kg 180
18
Embodied Water, L/kg 130
45

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 29 to 78
26 to 28
Strength to Weight: Bending, points 25 to 48
23 to 24
Thermal Diffusivity, mm2/s 7.4
13
Thermal Shock Resistance, points 27 to 72
25 to 26

Alloy Composition

Carbon (C), % 2.2 to 2.5
0.72 to 0.85
Chromium (Cr), % 11.5 to 13.5
0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 76.6 to 81.9
98.5 to 99
Manganese (Mn), % 0 to 0.6
0.3 to 0.6
Molybdenum (Mo), % 0.7 to 1.2
0
Nickel (Ni), % 0 to 0.3
0
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0 to 0.6
0
Sulfur (S), % 0 to 0.030
0 to 0.050
Vanadium (V), % 3.8 to 4.4
0