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SAE-AISI 1039 Steel vs. SAE-AISI 4718 Steel

Both SAE-AISI 1039 steel and SAE-AISI 4718 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 1039 steel and the bottom bar is SAE-AISI 4718 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180 to 200
150
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 14 to 18
24
Fatigue Strength, MPa 230 to 370
270
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 380 to 420
330
Tensile Strength: Ultimate (UTS), MPa 610 to 690
510
Tensile Strength: Yield (Proof), MPa 340 to 580
370

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 400
420
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 51
39
Thermal Expansion, µm/m-K 12
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.0
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.1
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
3.0
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.4
1.6
Embodied Energy, MJ/kg 18
21
Embodied Water, L/kg 46
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 88 to 94
110
Resilience: Unit (Modulus of Resilience), kJ/m3 310 to 890
360
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 22 to 24
18
Strength to Weight: Bending, points 20 to 22
18
Thermal Diffusivity, mm2/s 14
10
Thermal Shock Resistance, points 19 to 22
17

Alloy Composition

Carbon (C), % 0.37 to 0.44
0.16 to 0.21
Chromium (Cr), % 0
0.35 to 0.55
Iron (Fe), % 98.5 to 98.9
96.3 to 97.4
Manganese (Mn), % 0.7 to 1.0
0.7 to 0.9
Molybdenum (Mo), % 0
0.3 to 0.4
Nickel (Ni), % 0
0.9 to 1.2
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0
0.15 to 0.35
Sulfur (S), % 0 to 0.050
0 to 0.040