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S44635 Stainless Steel vs. SAE-AISI 4340 Steel

Both S44635 stainless steel and SAE-AISI 4340 steel are iron alloys. They have 69% 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 S44635 stainless steel and the bottom bar is SAE-AISI 4340 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 240
210 to 360
Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 23
12 to 22
Fatigue Strength, MPa 390
330 to 740
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 81
73
Shear Strength, MPa 450
430 to 770
Tensile Strength: Ultimate (UTS), MPa 710
690 to 1280
Tensile Strength: Yield (Proof), MPa 580
470 to 1150

Thermal Properties

Latent Heat of Fusion, J/g 300
250
Maximum Temperature: Mechanical, °C 1100
430
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 16
44
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
7.5
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 22
3.5
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 4.4
1.7
Embodied Energy, MJ/kg 62
22
Embodied Water, L/kg 170
53

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 150
79 to 170
Resilience: Unit (Modulus of Resilience), kJ/m3 810
590 to 3490
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 25
24 to 45
Strength to Weight: Bending, points 23
22 to 33
Thermal Diffusivity, mm2/s 4.4
12
Thermal Shock Resistance, points 23
20 to 38

Alloy Composition

Carbon (C), % 0 to 0.025
0.38 to 0.43
Chromium (Cr), % 24.5 to 26
0.7 to 0.9
Iron (Fe), % 61.5 to 68.5
95.1 to 96.3
Manganese (Mn), % 0 to 1.0
0.6 to 0.8
Molybdenum (Mo), % 3.5 to 4.5
0.2 to 0.3
Nickel (Ni), % 3.5 to 4.5
1.7 to 2.0
Niobium (Nb), % 0.2 to 0.8
0
Nitrogen (N), % 0 to 0.035
0
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 0.75
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040
Titanium (Ti), % 0.2 to 0.8
0