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SAE-AISI 4140 Steel vs. ASTM Grade LC1 Steel

Both SAE-AISI 4140 steel and ASTM grade LC1 steel are iron alloys. They have a very high 99% of their average alloy composition in common. There are 30 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 SAE-AISI 4140 steel and the bottom bar is ASTM grade LC1 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200 to 310
160
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11 to 26
27
Fatigue Strength, MPa 360 to 650
200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 690 to 1080
540
Tensile Strength: Yield (Proof), MPa 590 to 990
270

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 420
410
Melting Completion (Liquidus), °C 1460
1470
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 43
50
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
8.2

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
2.4
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.5
1.5
Embodied Energy, MJ/kg 20
20
Embodied Water, L/kg 51
47

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 74 to 180
120
Resilience: Unit (Modulus of Resilience), kJ/m3 920 to 2590
200
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 25 to 38
19
Strength to Weight: Bending, points 22 to 30
19
Thermal Diffusivity, mm2/s 12
13
Thermal Shock Resistance, points 20 to 32
16

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.25
Chromium (Cr), % 0.8 to 1.1
0
Iron (Fe), % 96.8 to 97.8
97.6 to 99.05
Manganese (Mn), % 0.75 to 1.0
0.5 to 0.8
Molybdenum (Mo), % 0.15 to 0.25
0.45 to 0.65
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0 to 0.6
Sulfur (S), % 0 to 0.040
0 to 0.045