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SAE-AISI 5155 Steel vs. EN 1.1203 Steel

Both SAE-AISI 5155 steel and EN 1.1203 steel are iron alloys. Their average alloy composition is basically identical.

For each property being compared, the top bar is SAE-AISI 5155 steel and the bottom bar is EN 1.1203 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
200 to 230
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 21
12 to 15
Fatigue Strength, MPa 260
210 to 310
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
72
Shear Strength, MPa 390
420 to 480
Tensile Strength: Ultimate (UTS), MPa 620
690 to 780
Tensile Strength: Yield (Proof), MPa 380
340 to 480

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 420
400
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 49
48
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 1.4
1.4
Embodied Energy, MJ/kg 19
19
Embodied Water, L/kg 49
47

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
69 to 100
Resilience: Unit (Modulus of Resilience), kJ/m3 380
310 to 610
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 22
25 to 28
Strength to Weight: Bending, points 21
22 to 24
Thermal Diffusivity, mm2/s 13
13
Thermal Shock Resistance, points 20
22 to 25

Alloy Composition

Carbon (C), % 0.51 to 0.59
0.52 to 0.6
Chromium (Cr), % 0.7 to 0.9
0 to 0.4
Iron (Fe), % 97.2 to 97.9
97.1 to 98.9
Manganese (Mn), % 0.7 to 0.9
0.6 to 0.9
Molybdenum (Mo), % 0
0 to 0.1
Nickel (Ni), % 0
0 to 0.4
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