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SAE-AISI 4340 Steel vs. N08925 Stainless Steel

Both SAE-AISI 4340 steel and N08925 stainless steel are iron alloys. They have 50% 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 4340 steel and the bottom bar is N08925 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 12 to 22
45
Fatigue Strength, MPa 330 to 740
310
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
80
Shear Strength, MPa 430 to 770
470
Tensile Strength: Ultimate (UTS), MPa 690 to 1280
680
Tensile Strength: Yield (Proof), MPa 470 to 1150
340

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Maximum Temperature: Mechanical, °C 430
1100
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
460
Thermal Conductivity, W/m-K 44
13
Thermal Expansion, µm/m-K 13
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.5
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 3.5
33
Density, g/cm3 7.8
8.1
Embodied Carbon, kg CO2/kg material 1.7
6.2
Embodied Energy, MJ/kg 22
84
Embodied Water, L/kg 53
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 79 to 170
250
Resilience: Unit (Modulus of Resilience), kJ/m3 590 to 3490
280
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 24 to 45
23
Strength to Weight: Bending, points 22 to 33
21
Thermal Diffusivity, mm2/s 12
3.5
Thermal Shock Resistance, points 20 to 38
15

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.020
Chromium (Cr), % 0.7 to 0.9
19 to 21
Copper (Cu), % 0
0.8 to 1.5
Iron (Fe), % 95.1 to 96.3
42.7 to 50.1
Manganese (Mn), % 0.6 to 0.8
0 to 1.0
Molybdenum (Mo), % 0.2 to 0.3
6.0 to 7.0
Nickel (Ni), % 1.7 to 2.0
24 to 26
Nitrogen (N), % 0
0.1 to 0.2
Phosphorus (P), % 0 to 0.035
0 to 0.045
Silicon (Si), % 0.15 to 0.35
0 to 0.5
Sulfur (S), % 0 to 0.040
0 to 0.030