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ASTM A356 Grade 9 vs. SAE-AISI 8645 Steel

Both ASTM A356 grade 9 and SAE-AISI 8645 steel are iron alloys. They have a very high 98% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is ASTM A356 grade 9 and the bottom bar is SAE-AISI 8645 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
180 to 200
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 17
12 to 23
Fatigue Strength, MPa 310
280 to 350
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 670
600 to 670
Tensile Strength: Yield (Proof), MPa 460
390 to 560

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Maximum Temperature: Mechanical, °C 440
410
Melting Completion (Liquidus), °C 1470
1460
Melting Onset (Solidus), °C 1430
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 41
39
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.5
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 3.6
2.6
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.4
1.5
Embodied Energy, MJ/kg 33
20
Embodied Water, L/kg 56
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 100
77 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 570
420 to 840
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 24
21 to 24
Strength to Weight: Bending, points 22
20 to 22
Thermal Diffusivity, mm2/s 11
10
Thermal Shock Resistance, points 19
18 to 20

Alloy Composition

Carbon (C), % 0 to 0.2
0.43 to 0.48
Chromium (Cr), % 1.0 to 1.5
0.4 to 0.6
Iron (Fe), % 95.2 to 97.2
96.5 to 97.7
Manganese (Mn), % 0.5 to 0.9
0.75 to 1.0
Molybdenum (Mo), % 0.9 to 1.2
0.15 to 0.25
Nickel (Ni), % 0
0.4 to 0.7
Phosphorus (P), % 0 to 0.035
0 to 0.035
Silicon (Si), % 0.2 to 0.6
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040
Vanadium (V), % 0.2 to 0.35
0