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EN 1.1221 Steel vs. SAE-AISI 5145 Steel

Both EN 1.1221 steel and SAE-AISI 5145 steel are iron alloys. Their average alloy composition is basically identical.

For each property being compared, the top bar is EN 1.1221 steel and the bottom bar is SAE-AISI 5145 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 250
170
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 10 to 21
20
Fatigue Strength, MPa 240 to 340
250
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
73
Shear Strength, MPa 450 to 520
350
Tensile Strength: Ultimate (UTS), MPa 730 to 870
560
Tensile Strength: Yield (Proof), MPa 390 to 550
370

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 1410
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 48
47
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 2.1
2.1
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.5
1.4
Embodied Energy, MJ/kg 19
19
Embodied Water, L/kg 47
49

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 67 to 130
100
Resilience: Unit (Modulus of Resilience), kJ/m3 410 to 800
360
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 26 to 31
20
Strength to Weight: Bending, points 23 to 26
19
Thermal Diffusivity, mm2/s 13
13
Thermal Shock Resistance, points 23 to 28
17

Alloy Composition

Carbon (C), % 0.57 to 0.65
0.43 to 0.48
Chromium (Cr), % 0 to 0.4
0.7 to 0.9
Iron (Fe), % 97.1 to 98.8
97.3 to 98
Manganese (Mn), % 0.6 to 0.9
0.7 to 0.9
Molybdenum (Mo), % 0 to 0.1
0
Nickel (Ni), % 0 to 0.4
0
Phosphorus (P), % 0 to 0.035
0 to 0.035
Silicon (Si), % 0 to 0.4
0.15 to 0.35
Sulfur (S), % 0 to 0.035
0 to 0.040