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SAE-AISI A7 Steel vs. SAE-AISI D4 Steel

Both SAE-AISI A7 steel and SAE-AISI D4 steel are iron alloys. They have a moderately high 93% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI A7 steel and the bottom bar is SAE-AISI D4 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
74
Tensile Strength: Ultimate (UTS), MPa 800 to 2150
760 to 2060

Thermal Properties

Latent Heat of Fusion, J/g 260
270
Melting Completion (Liquidus), °C 1470
1430
Melting Onset (Solidus), °C 1430
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 37
31
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 10
8.0
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 13
3.3
Embodied Energy, MJ/kg 200
49
Embodied Water, L/kg 100
100

Common Calculations

PREN (Pitting Resistance) 11
15
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 29 to 77
27 to 75
Strength to Weight: Bending, points 25 to 48
24 to 47
Thermal Diffusivity, mm2/s 10
8.3
Thermal Shock Resistance, points 27 to 72
23 to 63

Alloy Composition

Carbon (C), % 2.0 to 2.9
2.1 to 2.4
Chromium (Cr), % 5.0 to 5.8
11 to 13
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 81.4 to 87.7
80.6 to 86.3
Manganese (Mn), % 0 to 0.8
0 to 0.6
Molybdenum (Mo), % 0.9 to 1.4
0.7 to 1.2
Nickel (Ni), % 0 to 0.3
0 to 0.3
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0 to 0.5
0 to 0.6
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 0.5 to 1.5
0
Vanadium (V), % 3.9 to 5.2
0 to 1.0

Comparable Variants