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SAE-AISI 4145 Steel vs. S43932 Stainless Steel

Both SAE-AISI 4145 steel and S43932 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 82% 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 4145 steel and the bottom bar is S43932 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 310
160
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 16
25
Fatigue Strength, MPa 240
160
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
77
Shear Strength, MPa 360
300
Tensile Strength: Ultimate (UTS), MPa 580
460
Tensile Strength: Yield (Proof), MPa 360
230

Thermal Properties

Latent Heat of Fusion, J/g 250
280
Maximum Temperature: Mechanical, °C 420
890
Melting Completion (Liquidus), °C 1460
1440
Melting Onset (Solidus), °C 1420
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 42
23
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
2.7
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
3.2

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
12
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.5
2.7
Embodied Energy, MJ/kg 20
40
Embodied Water, L/kg 51
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 80
96
Resilience: Unit (Modulus of Resilience), kJ/m3 350
140
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 21
17
Strength to Weight: Bending, points 20
17
Thermal Diffusivity, mm2/s 11
6.3
Thermal Shock Resistance, points 17
16

Alloy Composition

Aluminum (Al), % 0
0 to 0.15
Carbon (C), % 0.43 to 0.48
0 to 0.030
Chromium (Cr), % 0.8 to 1.1
17 to 19
Iron (Fe), % 96.7 to 97.7
76.7 to 83
Manganese (Mn), % 0.75 to 1.0
0 to 1.0
Molybdenum (Mo), % 0.15 to 0.25
0
Nickel (Ni), % 0
0 to 0.5
Niobium (Nb), % 0
0.2 to 0.75
Nitrogen (N), % 0
0 to 0.030
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.030
Titanium (Ti), % 0
0.2 to 0.75