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SAE-AISI 4340M Steel vs. N08020 Stainless Steel

Both SAE-AISI 4340M steel and N08020 stainless steel are iron alloys. They have 41% 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 4340M steel and the bottom bar is N08020 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 6.0
15 to 34
Fatigue Strength, MPa 690
210 to 240
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
77
Shear Strength, MPa 1360
380 to 410
Tensile Strength: Ultimate (UTS), MPa 2340
610 to 620
Tensile Strength: Yield (Proof), MPa 1240
270 to 420

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Maximum Temperature: Mechanical, °C 430
1100
Melting Completion (Liquidus), °C 1440
1410
Melting Onset (Solidus), °C 1400
1360
Specific Heat Capacity, J/kg-K 480
460
Thermal Conductivity, W/m-K 38
12
Thermal Expansion, µm/m-K 13
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
1.6
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
1.8

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
38
Density, g/cm3 7.8
8.2
Embodied Carbon, kg CO2/kg material 1.9
6.6
Embodied Energy, MJ/kg 26
92
Embodied Water, L/kg 55
220

Common Calculations

PREN (Pitting Resistance) 2.2
28
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
83 to 170
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
180 to 440
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 84
21
Strength to Weight: Bending, points 51
20
Thermal Diffusivity, mm2/s 10
3.2
Thermal Shock Resistance, points 70
15

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.070
Chromium (Cr), % 0.7 to 1.0
19 to 21
Copper (Cu), % 0
3.0 to 4.0
Iron (Fe), % 93.3 to 94.8
29.9 to 44
Manganese (Mn), % 0.65 to 0.9
0 to 2.0
Molybdenum (Mo), % 0.35 to 0.45
2.0 to 3.0
Nickel (Ni), % 1.7 to 2.0
32 to 38
Niobium (Nb), % 0
0 to 1.0
Phosphorus (P), % 0 to 0.012
0 to 0.045
Silicon (Si), % 1.5 to 1.8
0 to 1.0
Sulfur (S), % 0 to 0.012
0 to 0.035
Vanadium (V), % 0.050 to 0.1
0