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EN 1.8550 Steel vs. EN 1.7725 Steel

Both EN 1.8550 steel and EN 1.7725 steel are iron alloys. They have a very high 98% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (1, 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 1.7725 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 300
250 to 300
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11
14
Fatigue Strength, MPa 470
390 to 550
Impact Strength: V-Notched Charpy, J 34
34 to 35
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 1000
830 to 1000
Tensile Strength: Yield (Proof), MPa 760
610 to 860

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 440
440
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
39
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 3.4
2.9
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.7
1.8
Embodied Energy, MJ/kg 23
24
Embodied Water, L/kg 67
54

Common Calculations

PREN (Pitting Resistance) 2.3
2.8
Resilience: Ultimate (Unit Rupture Work), MJ/m3 100
110 to 130
Resilience: Unit (Modulus of Resilience), kJ/m3 1550
980 to 1940
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 36
29 to 35
Strength to Weight: Bending, points 29
25 to 28
Thermal Diffusivity, mm2/s 11
11
Thermal Shock Resistance, points 29
24 to 29

Alloy Composition

Aluminum (Al), % 0.8 to 1.2
0
Carbon (C), % 0.3 to 0.37
0.27 to 0.34
Chromium (Cr), % 1.5 to 1.8
1.3 to 1.7
Iron (Fe), % 94.4 to 96.3
95.7 to 97.5
Manganese (Mn), % 0.4 to 0.7
0.6 to 1.0
Molybdenum (Mo), % 0.15 to 0.25
0.3 to 0.5
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
Vanadium (V), % 0
0.050 to 0.15