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SAE-AISI 4145 Steel vs. S32615 Stainless Steel

Both SAE-AISI 4145 steel and S32615 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 54% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4145 steel and the bottom bar is S32615 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 310
170
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 16
28
Fatigue Strength, MPa 240
180
Poisson's Ratio 0.29
0.28
Reduction in Area, % 46
46
Shear Modulus, GPa 73
75
Shear Strength, MPa 360
400
Tensile Strength: Ultimate (UTS), MPa 580
620
Tensile Strength: Yield (Proof), MPa 360
250

Thermal Properties

Latent Heat of Fusion, J/g 250
370
Maximum Temperature: Mechanical, °C 420
990
Melting Completion (Liquidus), °C 1460
1350
Melting Onset (Solidus), °C 1420
1310
Specific Heat Capacity, J/kg-K 470
500
Thermal Expansion, µm/m-K 13
15

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
24
Density, g/cm3 7.8
7.6
Embodied Carbon, kg CO2/kg material 1.5
4.4
Embodied Energy, MJ/kg 20
63
Embodied Water, L/kg 51
170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 80
140
Resilience: Unit (Modulus of Resilience), kJ/m3 350
160
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 21
23
Strength to Weight: Bending, points 20
21
Thermal Shock Resistance, points 17
15

Alloy Composition

Carbon (C), % 0.43 to 0.48
0 to 0.070
Chromium (Cr), % 0.8 to 1.1
16.5 to 19.5
Copper (Cu), % 0
1.5 to 2.5
Iron (Fe), % 96.7 to 97.7
46.4 to 57.9
Manganese (Mn), % 0.75 to 1.0
0 to 2.0
Molybdenum (Mo), % 0.15 to 0.25
0.3 to 1.5
Nickel (Ni), % 0
19 to 22
Phosphorus (P), % 0 to 0.035
0 to 0.045
Silicon (Si), % 0.15 to 0.35
4.8 to 6.0
Sulfur (S), % 0 to 0.040
0 to 0.030