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SAE-AISI 4340M Steel vs. ASTM Grade LC9 Steel

Both SAE-AISI 4340M steel and ASTM grade LC9 steel are iron alloys. They have a moderately high 92% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4340M steel and the bottom bar is ASTM grade LC9 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 710
200
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 6.0
22
Fatigue Strength, MPa 690
420
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
73
Tensile Strength: Ultimate (UTS), MPa 2340
660
Tensile Strength: Yield (Proof), MPa 1240
590

Thermal Properties

Latent Heat of Fusion, J/g 280
260
Maximum Temperature: Mechanical, °C 430
430
Melting Completion (Liquidus), °C 1440
1450
Melting Onset (Solidus), °C 1400
1410
Specific Heat Capacity, J/kg-K 480
470
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
8.9
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
10

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
8.0
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.9
2.3
Embodied Energy, MJ/kg 26
31
Embodied Water, L/kg 55
65

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
140
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
920
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 84
23
Strength to Weight: Bending, points 51
21
Thermal Shock Resistance, points 70
20

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.13
Chromium (Cr), % 0.7 to 1.0
0 to 0.5
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 93.3 to 94.8
87.4 to 91.5
Manganese (Mn), % 0.65 to 0.9
0 to 0.9
Molybdenum (Mo), % 0.35 to 0.45
0 to 0.2
Nickel (Ni), % 1.7 to 2.0
8.5 to 10
Phosphorus (P), % 0 to 0.012
0 to 0.040
Silicon (Si), % 1.5 to 1.8
0 to 0.45
Sulfur (S), % 0 to 0.012
0 to 0.045
Vanadium (V), % 0.050 to 0.1
0 to 0.030