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SAE-AISI 8740 Steel vs. ASTM Grade LC9 Steel

Both SAE-AISI 8740 steel and ASTM grade LC9 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 SAE-AISI 8740 steel and the bottom bar is ASTM grade LC9 steel.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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