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Quenched And Tempered SAE-AISI 4150 vs. EN 1.7218 +QT Steel

Both quenched and tempered SAE-AISI 4150 and EN 1.7218 +QT steel are iron alloys. Both are furnished in the quenched and tempered condition. Their average alloy composition is basically identical. There are 31 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is quenched and tempered SAE-AISI 4150 and the bottom bar is EN 1.7218 +QT steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 380
230
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 14
16
Fatigue Strength, MPa 780
350
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 800
470
Tensile Strength: Ultimate (UTS), MPa 1310
760
Tensile Strength: Yield (Proof), MPa 1220
530

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 420
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 42
44
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
8.5

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
2.6
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.5
1.5
Embodied Energy, MJ/kg 20
20
Embodied Water, L/kg 51
52

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
110
Resilience: Unit (Modulus of Resilience), kJ/m3 3930
740
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 47
27
Strength to Weight: Bending, points 34
24
Thermal Diffusivity, mm2/s 11
12
Thermal Shock Resistance, points 39
22

Alloy Composition

Aluminum (Al), % 0
0 to 0.040
Carbon (C), % 0.48 to 0.53
0.22 to 0.29
Chromium (Cr), % 0.8 to 1.1
0.9 to 1.2
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 96.7 to 97.7
96.2 to 98.1
Manganese (Mn), % 0.75 to 1.0
0.6 to 0.9
Molybdenum (Mo), % 0.15 to 0.25
0.15 to 0.3
Nickel (Ni), % 0
0 to 0.3
Phosphorus (P), % 0 to 0.035
0 to 0.035
Silicon (Si), % 0.15 to 0.35
0 to 0.4
Sulfur (S), % 0 to 0.040
0 to 0.035