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EN 1.6553 Steel vs. EN 1.7231 Steel

Both EN 1.6553 steel and EN 1.7231 steel are iron alloys. Their average alloy composition is basically identical.

For each property being compared, the top bar is EN 1.6553 steel and the bottom bar is EN 1.7231 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 240
240 to 280
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 19 to 21
11 to 12
Fatigue Strength, MPa 330 to 460
360 to 500
Impact Strength: V-Notched Charpy, J 30
28 to 30
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 710 to 800
790 to 930
Tensile Strength: Yield (Proof), MPa 470 to 670
570 to 800

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 39
46
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.5
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 2.7
2.5
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.6
1.5
Embodied Energy, MJ/kg 21
20
Embodied Water, L/kg 51
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 130 to 150
87 to 100
Resilience: Unit (Modulus of Resilience), kJ/m3 600 to 1190
870 to 1700
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 25 to 28
28 to 33
Strength to Weight: Bending, points 23 to 24
24 to 27
Thermal Diffusivity, mm2/s 10
12
Thermal Shock Resistance, points 21 to 23
23 to 27

Alloy Composition

Carbon (C), % 0.23 to 0.28
0.38 to 0.45
Chromium (Cr), % 0.4 to 0.8
0.8 to 1.2
Copper (Cu), % 0 to 0.3
0
Iron (Fe), % 95.6 to 98.2
96.4 to 98.1
Manganese (Mn), % 0.6 to 1.0
0.6 to 1.0
Molybdenum (Mo), % 0.15 to 0.3
0.15 to 0.3
Nickel (Ni), % 0.4 to 0.8
0
Phosphorus (P), % 0 to 0.030
0 to 0.025
Silicon (Si), % 0 to 0.8
0 to 0.6
Sulfur (S), % 0 to 0.025
0 to 0.030
Vanadium (V), % 0 to 0.030
0