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Hardened SAE-AISI A9 vs. Hardened SAE-AISI D7

Both hardened SAE-AISI A9 and hardened SAE-AISI D7 are iron alloys. Both are furnished in the hardened (H) condition. They have 88% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is hardened SAE-AISI A9 and the bottom bar is hardened SAE-AISI D7.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.28
Rockwell C Hardness 63
65
Shear Modulus, GPa 74
73
Tensile Strength: Ultimate (UTS), MPa 2030
2120

Thermal Properties

Latent Heat of Fusion, J/g 280
270
Melting Completion (Liquidus), °C 1460
1440
Melting Onset (Solidus), °C 1410
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 35
27
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
10
Density, g/cm3 7.8
7.6
Embodied Carbon, kg CO2/kg material 4.7
11
Embodied Energy, MJ/kg 70
180
Embodied Water, L/kg 82
130

Common Calculations

PREN (Pitting Resistance) 10
16
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 73
78
Strength to Weight: Bending, points 46
48
Thermal Diffusivity, mm2/s 9.6
7.4
Thermal Shock Resistance, points 66
72

Alloy Composition

Carbon (C), % 0.45 to 0.55
2.2 to 2.5
Chromium (Cr), % 4.8 to 5.5
11.5 to 13.5
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 87 to 90.5
76.6 to 81.9
Manganese (Mn), % 0 to 0.5
0 to 0.6
Molybdenum (Mo), % 1.3 to 1.8
0.7 to 1.2
Nickel (Ni), % 1.3 to 1.8
0 to 0.3
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 1.0 to 1.2
0 to 0.6
Sulfur (S), % 0 to 0.030
0 to 0.030
Vanadium (V), % 0.8 to 1.4
3.8 to 4.4