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EN 1.7231 Steel vs. EN 1.7230 Steel

Both EN 1.7231 steel and EN 1.7230 steel are iron alloys. Their average alloy composition is basically identical.

For each property being compared, the top bar is EN 1.7231 steel and the bottom bar is EN 1.7230 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 240 to 280
220 to 270
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11 to 12
11 to 12
Fatigue Strength, MPa 360 to 500
320 to 460
Impact Strength: V-Notched Charpy, J 28 to 30
29 to 30
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 790 to 930
720 to 910
Tensile Strength: Yield (Proof), MPa 570 to 800
510 to 740

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 46
44
Thermal Expansion, µm/m-K 13
13

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 2.5
2.4
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
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 87 to 100
79 to 97
Resilience: Unit (Modulus of Resilience), kJ/m3 870 to 1700
700 to 1460
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 28 to 33
26 to 32
Strength to Weight: Bending, points 24 to 27
23 to 27
Thermal Diffusivity, mm2/s 12
12
Thermal Shock Resistance, points 23 to 27
21 to 27

Alloy Composition

Carbon (C), % 0.38 to 0.45
0.3 to 0.37
Chromium (Cr), % 0.8 to 1.2
0.8 to 1.2
Iron (Fe), % 96.4 to 98.1
96.7 to 98.3
Manganese (Mn), % 0.6 to 1.0
0.5 to 0.8
Molybdenum (Mo), % 0.15 to 0.3
0.15 to 0.3
Phosphorus (P), % 0 to 0.025
0 to 0.025
Silicon (Si), % 0 to 0.6
0 to 0.6
Sulfur (S), % 0 to 0.030
0 to 0.030