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SAE-AISI 4720 Steel vs. SAE-AISI 12L14 Steel

Both SAE-AISI 4720 steel and SAE-AISI 12L14 steel are iron alloys. They have a very high 98% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4720 steel and the bottom bar is SAE-AISI 12L14 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
140 to 170
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 25
11 to 25
Fatigue Strength, MPa 260
190 to 290
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
72
Shear Strength, MPa 310
280 to 370
Tensile Strength: Ultimate (UTS), MPa 490
440 to 620
Tensile Strength: Yield (Proof), MPa 350
260 to 460

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 410
400
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 39
51
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
7.1
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
8.2

Otherwise Unclassified Properties

Base Metal Price, % relative 2.9
1.8
Density, g/cm3 7.9
7.9
Embodied Carbon, kg CO2/kg material 1.6
1.4
Embodied Energy, MJ/kg 21
18
Embodied Water, L/kg 50
47

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
64 to 93
Resilience: Unit (Modulus of Resilience), kJ/m3 330
180 to 560
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 17
15 to 22
Strength to Weight: Bending, points 18
16 to 20
Thermal Diffusivity, mm2/s 10
14
Thermal Shock Resistance, points 14
14 to 20

Alloy Composition

Carbon (C), % 0.17 to 0.22
0 to 0.15
Chromium (Cr), % 0.35 to 0.55
0
Iron (Fe), % 96.7 to 97.8
97.9 to 98.7
Lead (Pb), % 0
0.15 to 0.35
Manganese (Mn), % 0.5 to 0.7
0.85 to 1.2
Molybdenum (Mo), % 0.15 to 0.25
0
Nickel (Ni), % 0.9 to 1.2
0
Phosphorus (P), % 0 to 0.035
0.040 to 0.090
Silicon (Si), % 0.15 to 0.35
0
Sulfur (S), % 0 to 0.040
0.26 to 0.35