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SAE-AISI 4145 Steel vs. S28200 Stainless Steel

Both SAE-AISI 4145 steel and S28200 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 63% 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 S28200 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 310
260
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 16
45
Fatigue Strength, MPa 240
430
Poisson's Ratio 0.29
0.28
Reduction in Area, % 46
57
Shear Modulus, GPa 73
77
Shear Strength, MPa 360
610
Tensile Strength: Ultimate (UTS), MPa 580
870
Tensile Strength: Yield (Proof), MPa 360
460

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Maximum Temperature: Mechanical, °C 420
900
Melting Completion (Liquidus), °C 1460
1380
Melting Onset (Solidus), °C 1420
1330
Specific Heat Capacity, J/kg-K 470
480
Thermal Expansion, µm/m-K 13
18

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
12
Density, g/cm3 7.8
7.6
Embodied Carbon, kg CO2/kg material 1.5
2.8
Embodied Energy, MJ/kg 20
41
Embodied Water, L/kg 51
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 80
330
Resilience: Unit (Modulus of Resilience), kJ/m3 350
540
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
26
Strength to Weight: Axial, points 21
32
Strength to Weight: Bending, points 20
27
Thermal Shock Resistance, points 17
17

Alloy Composition

Carbon (C), % 0.43 to 0.48
0 to 0.15
Chromium (Cr), % 0.8 to 1.1
17 to 19
Copper (Cu), % 0
0.75 to 1.3
Iron (Fe), % 96.7 to 97.7
57.7 to 64.1
Manganese (Mn), % 0.75 to 1.0
17 to 19
Molybdenum (Mo), % 0.15 to 0.25
0.75 to 1.3
Nitrogen (N), % 0
0.4 to 0.6
Phosphorus (P), % 0 to 0.035
0 to 0.045
Silicon (Si), % 0.15 to 0.35
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.030