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SAE-AISI 4145 Steel vs. S82011 Stainless Steel

Both SAE-AISI 4145 steel and S82011 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 75% of their average alloy composition in common. There are 32 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 SAE-AISI 4145 steel and the bottom bar is S82011 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 310
250
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 16
34
Fatigue Strength, MPa 240
410
Poisson's Ratio 0.29
0.27
Rockwell C Hardness 33
27
Shear Modulus, GPa 73
78
Shear Strength, MPa 360
490
Tensile Strength: Ultimate (UTS), MPa 580
730
Tensile Strength: Yield (Proof), MPa 360
510

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Maximum Temperature: Mechanical, °C 420
1010
Melting Completion (Liquidus), °C 1460
1420
Melting Onset (Solidus), °C 1420
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 42
15
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
12
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.5
2.6
Embodied Energy, MJ/kg 20
37
Embodied Water, L/kg 51
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 80
220
Resilience: Unit (Modulus of Resilience), kJ/m3 350
660
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 21
27
Strength to Weight: Bending, points 20
24
Thermal Diffusivity, mm2/s 11
4.0
Thermal Shock Resistance, points 17
20

Alloy Composition

Carbon (C), % 0.43 to 0.48
0 to 0.030
Chromium (Cr), % 0.8 to 1.1
20.5 to 23.5
Copper (Cu), % 0
0 to 0.5
Iron (Fe), % 96.7 to 97.7
68.6 to 76.3
Manganese (Mn), % 0.75 to 1.0
2.0 to 3.0
Molybdenum (Mo), % 0.15 to 0.25
0.1 to 1.0
Nickel (Ni), % 0
1.0 to 2.0
Nitrogen (N), % 0
0.15 to 0.27
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 0.020