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EN 1.8550 Steel vs. EN 1.7231 Steel

Both EN 1.8550 steel and EN 1.7231 steel are iron alloys. They have a very high 98% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is EN 1.8550 steel and the bottom bar is EN 1.7231 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 300
240 to 280
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11
11 to 12
Fatigue Strength, MPa 470
360 to 500
Impact Strength: V-Notched Charpy, J 34
28 to 30
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 1000
790 to 930
Tensile Strength: Yield (Proof), MPa 760
570 to 800

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 440
420
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 40
46
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 3.4
2.5
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.7
1.5
Embodied Energy, MJ/kg 23
20
Embodied Water, L/kg 67
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 100
87 to 100
Resilience: Unit (Modulus of Resilience), kJ/m3 1550
870 to 1700
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 36
28 to 33
Strength to Weight: Bending, points 29
24 to 27
Thermal Diffusivity, mm2/s 11
12
Thermal Shock Resistance, points 29
23 to 27

Alloy Composition

Aluminum (Al), % 0.8 to 1.2
0
Carbon (C), % 0.3 to 0.37
0.38 to 0.45
Chromium (Cr), % 1.5 to 1.8
0.8 to 1.2
Iron (Fe), % 94.4 to 96.3
96.4 to 98.1
Manganese (Mn), % 0.4 to 0.7
0.6 to 1.0
Molybdenum (Mo), % 0.15 to 0.25
0.15 to 0.3
Nickel (Ni), % 0.85 to 1.2
0
Phosphorus (P), % 0 to 0.025
0 to 0.025
Silicon (Si), % 0 to 0.4
0 to 0.6
Sulfur (S), % 0 to 0.035
0 to 0.030