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ASTM A514 Steel vs. SAE-AISI 4718 Steel

Both ASTM A514 steel and SAE-AISI 4718 steel are iron alloys.

For each property being compared, the top bar is ASTM A514 steel and the bottom bar is SAE-AISI 4718 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 240 to 250
150
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 18 to 21
24
Fatigue Strength, MPa 470 to 540
270
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 490 to 520
330
Tensile Strength: Ultimate (UTS), MPa 790 to 830
510
Tensile Strength: Yield (Proof), MPa 690 to 770
370

Thermal Properties

Latent Heat of Fusion, J/g 250 to 260
250
Maximum Temperature: Mechanical, °C 400 to 440
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 37 to 51
39
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2 to 7.6
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3 to 8.8
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 2.3 to 3.8
3.0
Density, g/cm3 7.8 to 7.9
7.9
Embodied Carbon, kg CO2/kg material 1.6 to 1.8
1.6
Embodied Energy, MJ/kg 21 to 25
21
Embodied Water, L/kg 48 to 57
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 170
110
Resilience: Unit (Modulus of Resilience), kJ/m3 1280 to 1590
360
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 28 to 29
18
Strength to Weight: Bending, points 24 to 25
18
Thermal Diffusivity, mm2/s 10 to 14
10
Thermal Shock Resistance, points 23 to 24
17