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SAE-AISI 4718 Steel vs. AISI 301 Stainless Steel

Both SAE-AISI 4718 steel and AISI 301 stainless steel are iron alloys. They have 77% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (3, 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 301 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
190 to 440
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 24
7.4 to 46
Fatigue Strength, MPa 270
210 to 600
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
77
Shear Strength, MPa 330
410 to 860
Tensile Strength: Ultimate (UTS), MPa 510
590 to 1460
Tensile Strength: Yield (Proof), MPa 370
230 to 1080

Thermal Properties

Latent Heat of Fusion, J/g 250
280
Maximum Temperature: Mechanical, °C 420
840
Melting Completion (Liquidus), °C 1460
1420
Melting Onset (Solidus), °C 1420
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 39
16
Thermal Expansion, µm/m-K 11
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 3.0
13
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.6
2.7
Embodied Energy, MJ/kg 21
39
Embodied Water, L/kg 51
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
99 to 300
Resilience: Unit (Modulus of Resilience), kJ/m3 360
130 to 2970
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 18
21 to 52
Strength to Weight: Bending, points 18
20 to 37
Thermal Diffusivity, mm2/s 10
4.2
Thermal Shock Resistance, points 17
12 to 31

Alloy Composition

Carbon (C), % 0.16 to 0.21
0 to 0.15
Chromium (Cr), % 0.35 to 0.55
16 to 18
Iron (Fe), % 96.3 to 97.4
70.7 to 78
Manganese (Mn), % 0.7 to 0.9
0 to 2.0
Molybdenum (Mo), % 0.3 to 0.4
0
Nickel (Ni), % 0.9 to 1.2
6.0 to 8.0
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0 to 0.035
0 to 0.045
Silicon (Si), % 0.15 to 0.35
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.030