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ASTM Grade LC9 Steel vs. SAE-AISI 8740 Steel

Both ASTM grade LC9 steel and SAE-AISI 8740 steel are iron alloys. They have a moderately high 91% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is ASTM grade LC9 steel and the bottom bar is SAE-AISI 8740 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
170 to 200
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 22
11 to 23
Fatigue Strength, MPa 420
270 to 350
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 660
580 to 670
Tensile Strength: Yield (Proof), MPa 590
380 to 570

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Maximum Temperature: Mechanical, °C 430
410
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.9
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 10
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 8.0
2.6
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 2.3
1.5
Embodied Energy, MJ/kg 31
20
Embodied Water, L/kg 65
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
71 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 920
390 to 850
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23
20 to 24
Strength to Weight: Bending, points 21
20 to 22
Thermal Shock Resistance, points 20
17 to 20

Alloy Composition

Carbon (C), % 0 to 0.13
0.38 to 0.43
Chromium (Cr), % 0 to 0.5
0.4 to 0.6
Copper (Cu), % 0 to 0.3
0
Iron (Fe), % 87.4 to 91.5
96.5 to 97.7
Manganese (Mn), % 0 to 0.9
0.75 to 1.0
Molybdenum (Mo), % 0 to 0.2
0.2 to 0.3
Nickel (Ni), % 8.5 to 10
0.4 to 0.7
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 0.45
0.15 to 0.35
Sulfur (S), % 0 to 0.045
0 to 0.040
Vanadium (V), % 0 to 0.030
0