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SAE-AISI 4145 Steel vs. S35115 Stainless Steel

Both SAE-AISI 4145 steel and S35115 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 54% 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 S35115 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 310
210
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 16
46
Fatigue Strength, MPa 240
280
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
79
Shear Strength, MPa 360
470
Tensile Strength: Ultimate (UTS), MPa 580
670
Tensile Strength: Yield (Proof), MPa 360
310

Thermal Properties

Latent Heat of Fusion, J/g 250
310
Maximum Temperature: Mechanical, °C 420
1100
Melting Completion (Liquidus), °C 1460
1420
Melting Onset (Solidus), °C 1420
1370
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 42
15
Thermal Expansion, µm/m-K 13
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
26
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.5
4.8
Embodied Energy, MJ/kg 20
67
Embodied Water, L/kg 51
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 80
250
Resilience: Unit (Modulus of Resilience), kJ/m3 350
240
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 21
24
Strength to Weight: Bending, points 20
22
Thermal Diffusivity, mm2/s 11
3.9
Thermal Shock Resistance, points 17
15

Alloy Composition

Carbon (C), % 0.43 to 0.48
0 to 0.030
Chromium (Cr), % 0.8 to 1.1
23 to 25
Iron (Fe), % 96.7 to 97.7
47.6 to 55.8
Manganese (Mn), % 0.75 to 1.0
0 to 1.0
Molybdenum (Mo), % 0.15 to 0.25
1.5 to 2.5
Nickel (Ni), % 0
19 to 22
Nitrogen (N), % 0
0.2 to 0.3
Phosphorus (P), % 0 to 0.035
0 to 0.045
Silicon (Si), % 0.15 to 0.35
0.5 to 1.5
Sulfur (S), % 0 to 0.040
0 to 0.015