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Hardened SAE-AISI A9 vs. EN 1.7321 +H Steel

Both hardened SAE-AISI A9 and EN 1.7321 +H steel are iron alloys. Both are furnished in the hardened (H) condition. They have a moderately high 90% of their average alloy composition in common. There are 24 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 EN 1.7321 +H steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.29
Rockwell C Hardness 63
45
Shear Modulus, GPa 74
73
Tensile Strength: Ultimate (UTS), MPa 2030
1460

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 35
45
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.9
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 9.2
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
2.5
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 4.7
1.5
Embodied Energy, MJ/kg 70
20
Embodied Water, L/kg 82
50

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 73
52
Strength to Weight: Bending, points 46
36
Thermal Diffusivity, mm2/s 9.6
12
Thermal Shock Resistance, points 66
43

Alloy Composition

Carbon (C), % 0.45 to 0.55
0.17 to 0.23
Chromium (Cr), % 4.8 to 5.5
0.3 to 0.6
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 87 to 90.5
97.1 to 98.4
Manganese (Mn), % 0 to 0.5
0.7 to 1.0
Molybdenum (Mo), % 1.3 to 1.8
0.4 to 0.5
Nickel (Ni), % 1.3 to 1.8
0
Phosphorus (P), % 0 to 0.030
0 to 0.025
Silicon (Si), % 1.0 to 1.2
0 to 0.3
Sulfur (S), % 0 to 0.030
0 to 0.025
Vanadium (V), % 0.8 to 1.4
0