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S40910 Stainless Steel vs. SAE-AISI 4340 Steel

Both S40910 stainless steel and SAE-AISI 4340 steel are iron alloys. They have 89% 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 S40910 stainless steel and the bottom bar is SAE-AISI 4340 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
210 to 360
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 23
12 to 22
Fatigue Strength, MPa 130
330 to 740
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
73
Shear Strength, MPa 270
430 to 770
Tensile Strength: Ultimate (UTS), MPa 430
690 to 1280
Tensile Strength: Yield (Proof), MPa 190
470 to 1150

Thermal Properties

Latent Heat of Fusion, J/g 270
250
Maximum Temperature: Mechanical, °C 710
430
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 26
44
Thermal Expansion, µm/m-K 10
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
7.5
Electrical Conductivity: Equal Weight (Specific), % IACS 3.3
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
3.5
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.0
1.7
Embodied Energy, MJ/kg 28
22
Embodied Water, L/kg 94
53

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 80
79 to 170
Resilience: Unit (Modulus of Resilience), kJ/m3 94
590 to 3490
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 16
24 to 45
Strength to Weight: Bending, points 16
22 to 33
Thermal Diffusivity, mm2/s 6.9
12
Thermal Shock Resistance, points 16
20 to 38

Alloy Composition

Carbon (C), % 0 to 0.030
0.38 to 0.43
Chromium (Cr), % 10.5 to 11.7
0.7 to 0.9
Iron (Fe), % 85 to 89.5
95.1 to 96.3
Manganese (Mn), % 0 to 1.0
0.6 to 0.8
Molybdenum (Mo), % 0
0.2 to 0.3
Nickel (Ni), % 0 to 0.5
1.7 to 2.0
Niobium (Nb), % 0 to 0.17
0
Nitrogen (N), % 0 to 0.030
0
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.020
0 to 0.040
Titanium (Ti), % 0 to 0.5
0