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Annealed SAE-AISI A9 vs. Annealed SAE-AISI D2

Both annealed SAE-AISI A9 and annealed SAE-AISI D2 are iron alloys. Both are furnished in the annealed condition. They have a moderately high 92% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is annealed SAE-AISI A9 and the bottom bar is annealed SAE-AISI D2.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 230
230
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 21
16
Fatigue Strength, MPa 250
310
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 74
75
Shear Strength, MPa 480
460
Tensile Strength: Ultimate (UTS), MPa 770
760
Tensile Strength: Yield (Proof), MPa 360
470

Thermal Properties

Latent Heat of Fusion, J/g 280
270
Melting Completion (Liquidus), °C 1460
1440
Melting Onset (Solidus), °C 1410
1390
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 35
31
Thermal Expansion, µm/m-K 12
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.9
4.3
Electrical Conductivity: Equal Weight (Specific), % IACS 9.2
5.1

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
8.0
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 4.7
3.4
Embodied Energy, MJ/kg 70
50
Embodied Water, L/kg 82
100

Common Calculations

PREN (Pitting Resistance) 10
15
Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
100
Resilience: Unit (Modulus of Resilience), kJ/m3 350
570
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 28
27
Strength to Weight: Bending, points 24
24
Thermal Diffusivity, mm2/s 9.6
8.3
Thermal Shock Resistance, points 25
25

Alloy Composition

Carbon (C), % 0.45 to 0.55
1.4 to 1.6
Chromium (Cr), % 4.8 to 5.5
11 to 13
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 87 to 90.5
81.3 to 86.9
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
0 to 1.1