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SAE-AISI 4320 Steel vs. N08801 Stainless Steel

Both SAE-AISI 4320 steel and N08801 stainless steel are iron alloys. They have 48% of their average alloy composition in common. There are 30 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 4320 steel and the bottom bar is N08801 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 21 to 29
34
Fatigue Strength, MPa 320
260
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
77
Shear Strength, MPa 370 to 500
570
Tensile Strength: Ultimate (UTS), MPa 570 to 790
860
Tensile Strength: Yield (Proof), MPa 430 to 460
190

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Maximum Temperature: Mechanical, °C 420
1090
Melting Completion (Liquidus), °C 1460
1390
Melting Onset (Solidus), °C 1420
1360
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 46
12
Thermal Expansion, µm/m-K 11
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 8.5
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 3.4
30
Density, g/cm3 7.9
8.0
Embodied Carbon, kg CO2/kg material 1.7
5.5
Embodied Energy, MJ/kg 22
79
Embodied Water, L/kg 52
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 150
220
Resilience: Unit (Modulus of Resilience), kJ/m3 480 to 560
92
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 20 to 28
30
Strength to Weight: Bending, points 19 to 24
25
Thermal Diffusivity, mm2/s 13
3.3
Thermal Shock Resistance, points 19 to 27
20

Alloy Composition

Carbon (C), % 0.17 to 0.22
0 to 0.1
Chromium (Cr), % 0.4 to 0.6
19 to 22
Copper (Cu), % 0
0 to 0.5
Iron (Fe), % 95.8 to 97
39.5 to 50.3
Manganese (Mn), % 0.45 to 0.65
0 to 1.5
Molybdenum (Mo), % 0.2 to 0.3
0
Nickel (Ni), % 1.7 to 2.0
30 to 34
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0.15 to 0.35
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.015
Titanium (Ti), % 0
0.75 to 1.5