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SAE-AISI A7 Steel vs. SAE-AISI D7 Steel

Both SAE-AISI A7 steel and SAE-AISI D7 steel are iron alloys. They have a moderately high 93% of their average alloy composition in common.

For each property being compared, the top bar is SAE-AISI A7 steel and the bottom bar is SAE-AISI D7 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
73
Tensile Strength: Ultimate (UTS), MPa 800 to 2150
800 to 2120

Thermal Properties

Latent Heat of Fusion, J/g 260
270
Melting Completion (Liquidus), °C 1470
1440
Melting Onset (Solidus), °C 1430
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 37
27
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Base Metal Price, % relative 10
10
Density, g/cm3 7.7
7.6
Embodied Carbon, kg CO2/kg material 13
11
Embodied Energy, MJ/kg 200
180
Embodied Water, L/kg 100
130

Common Calculations

PREN (Pitting Resistance) 11
16
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 29 to 77
29 to 78
Strength to Weight: Bending, points 25 to 48
25 to 48
Thermal Diffusivity, mm2/s 10
7.4
Thermal Shock Resistance, points 27 to 72
27 to 72

Alloy Composition

Carbon (C), % 2.0 to 2.9
2.2 to 2.5
Chromium (Cr), % 5.0 to 5.8
11.5 to 13.5
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 81.4 to 87.7
76.6 to 81.9
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
3.8 to 4.4

Comparable Variants