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AISI 308 Stainless Steel vs. SAE-AISI 4145 Steel

Both AISI 308 stainless steel and SAE-AISI 4145 steel are iron alloys. Both are furnished in the annealed condition. They have 70% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is AISI 308 stainless steel and the bottom bar is SAE-AISI 4145 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
310
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 45
16
Fatigue Strength, MPa 210
240
Poisson's Ratio 0.28
0.29
Reduction in Area, % 57
46
Shear Modulus, GPa 78
73
Shear Strength, MPa 410
360
Tensile Strength: Ultimate (UTS), MPa 590
580
Tensile Strength: Yield (Proof), MPa 230
360

Thermal Properties

Latent Heat of Fusion, J/g 290
250
Maximum Temperature: Mechanical, °C 990
420
Melting Completion (Liquidus), °C 1420
1460
Melting Onset (Solidus), °C 1380
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
42
Thermal Expansion, µm/m-K 16
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.8
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 17
2.4
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.2
1.5
Embodied Energy, MJ/kg 46
20
Embodied Water, L/kg 150
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 210
80
Resilience: Unit (Modulus of Resilience), kJ/m3 140
350
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 21
21
Strength to Weight: Bending, points 20
20
Thermal Diffusivity, mm2/s 4.1
11
Thermal Shock Resistance, points 13
17

Alloy Composition

Carbon (C), % 0 to 0.080
0.43 to 0.48
Chromium (Cr), % 19 to 21
0.8 to 1.1
Iron (Fe), % 64.1 to 71
96.7 to 97.7
Manganese (Mn), % 0 to 2.0
0.75 to 1.0
Molybdenum (Mo), % 0
0.15 to 0.25
Nickel (Ni), % 10 to 12
0
Phosphorus (P), % 0 to 0.045
0 to 0.035
Silicon (Si), % 0 to 0.75
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040