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SAE-AISI 4718 Steel vs. SAE-AISI 1025 Steel

Both SAE-AISI 4718 steel and SAE-AISI 1025 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 4718 steel and the bottom bar is SAE-AISI 1025 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
130 to 140
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 24
17 to 28
Fatigue Strength, MPa 270
190 to 280
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 330
290 to 310
Tensile Strength: Ultimate (UTS), MPa 510
450 to 500
Tensile Strength: Yield (Proof), MPa 370
250 to 420

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 420
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
52
Thermal Expansion, µm/m-K 11
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
6.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
8.0

Otherwise Unclassified Properties

Base Metal Price, % relative 3.0
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 51
45

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
80 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 360
170 to 470
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 18
16 to 18
Strength to Weight: Bending, points 18
17 to 18
Thermal Diffusivity, mm2/s 10
14
Thermal Shock Resistance, points 17
14 to 16

Alloy Composition

Carbon (C), % 0.16 to 0.21
0.22 to 0.28
Chromium (Cr), % 0.35 to 0.55
0
Iron (Fe), % 96.3 to 97.4
99.03 to 99.48
Manganese (Mn), % 0.7 to 0.9
0.3 to 0.6
Molybdenum (Mo), % 0.3 to 0.4
0
Nickel (Ni), % 0.9 to 1.2
0
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0
Sulfur (S), % 0 to 0.040
0 to 0.050