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SAE-AISI 4145 Steel vs. S32550 Stainless Steel

Both SAE-AISI 4145 steel and S32550 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 64% of their average alloy composition in common. There are 33 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4145 steel and the bottom bar is S32550 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 310
260
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 16
21
Fatigue Strength, MPa 240
400
Poisson's Ratio 0.29
0.27
Reduction in Area, % 46
57
Rockwell C Hardness 33
28
Shear Modulus, GPa 73
80
Shear Strength, MPa 360
540
Tensile Strength: Ultimate (UTS), MPa 580
860
Tensile Strength: Yield (Proof), MPa 360
620

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Maximum Temperature: Mechanical, °C 420
1100
Melting Completion (Liquidus), °C 1460
1440
Melting Onset (Solidus), °C 1420
1390
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 42
16
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
20
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.5
3.8
Embodied Energy, MJ/kg 20
53
Embodied Water, L/kg 51
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 80
160
Resilience: Unit (Modulus of Resilience), kJ/m3 350
940
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 21
31
Strength to Weight: Bending, points 20
26
Thermal Diffusivity, mm2/s 11
4.4
Thermal Shock Resistance, points 17
23

Alloy Composition

Carbon (C), % 0.43 to 0.48
0 to 0.040
Chromium (Cr), % 0.8 to 1.1
24 to 27
Copper (Cu), % 0
1.5 to 2.5
Iron (Fe), % 96.7 to 97.7
57.2 to 67
Manganese (Mn), % 0.75 to 1.0
0 to 1.5
Molybdenum (Mo), % 0.15 to 0.25
2.9 to 3.9
Nickel (Ni), % 0
4.5 to 6.5
Nitrogen (N), % 0
0.1 to 0.25
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