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SAE-AISI 1020 Steel vs. SAE-AISI 4145 Steel

Both SAE-AISI 1020 steel and SAE-AISI 4145 steel are iron alloys. They have a very high 98% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 1020 steel and the bottom bar is SAE-AISI 4145 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 120 to 130
310
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 17 to 28
16
Fatigue Strength, MPa 180 to 250
240
Poisson's Ratio 0.29
0.29
Reduction in Area, % 45 to 57
46
Shear Modulus, GPa 73
73
Shear Strength, MPa 280
360
Tensile Strength: Ultimate (UTS), MPa 430 to 460
580
Tensile Strength: Yield (Proof), MPa 240 to 380
360

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 400
420
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 52
42
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 12
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
2.4
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.4
1.5
Embodied Energy, MJ/kg 18
20
Embodied Water, L/kg 45
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 72 to 100
80
Resilience: Unit (Modulus of Resilience), kJ/m3 150 to 380
350
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 15 to 16
21
Strength to Weight: Bending, points 16 to 17
20
Thermal Diffusivity, mm2/s 14
11
Thermal Shock Resistance, points 13 to 14
17

Alloy Composition

Carbon (C), % 0.18 to 0.23
0.43 to 0.48
Chromium (Cr), % 0
0.8 to 1.1
Iron (Fe), % 99.08 to 99.52
96.7 to 97.7
Manganese (Mn), % 0.3 to 0.6
0.75 to 1.0
Molybdenum (Mo), % 0
0.15 to 0.25
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0
0.15 to 0.35
Sulfur (S), % 0 to 0.050
0 to 0.040