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SAE-AISI 4718 Steel vs. AISI 439 Stainless Steel

Both SAE-AISI 4718 steel and AISI 439 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 81% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4718 steel and the bottom bar is AISI 439 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
160
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 24
23
Fatigue Strength, MPa 270
170
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
77
Shear Strength, MPa 330
310
Tensile Strength: Ultimate (UTS), MPa 510
490
Tensile Strength: Yield (Proof), MPa 370
250

Thermal Properties

Latent Heat of Fusion, J/g 250
280
Maximum Temperature: Mechanical, °C 420
890
Melting Completion (Liquidus), °C 1460
1510
Melting Onset (Solidus), °C 1420
1430
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 39
25
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
3.4

Otherwise Unclassified Properties

Base Metal Price, % relative 3.0
9.0
Density, g/cm3 7.9
7.7
Embodied Carbon, kg CO2/kg material 1.6
2.3
Embodied Energy, MJ/kg 21
34
Embodied Water, L/kg 51
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
95
Resilience: Unit (Modulus of Resilience), kJ/m3 360
160
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 18
18
Strength to Weight: Bending, points 18
18
Thermal Diffusivity, mm2/s 10
6.7
Thermal Shock Resistance, points 17
16

Alloy Composition

Aluminum (Al), % 0
0 to 0.15
Carbon (C), % 0.16 to 0.21
0 to 0.030
Chromium (Cr), % 0.35 to 0.55
17 to 19
Iron (Fe), % 96.3 to 97.4
77.1 to 82.8
Manganese (Mn), % 0.7 to 0.9
0 to 1.0
Molybdenum (Mo), % 0.3 to 0.4
0
Nickel (Ni), % 0.9 to 1.2
0 to 0.5
Nitrogen (N), % 0
0 to 0.030
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.030
Titanium (Ti), % 0
0.2 to 1.1