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EN 1.8550 Steel vs. EN 1.8509 Steel

Both EN 1.8550 steel and EN 1.8509 steel are iron alloys. Both are furnished in the quenched and tempered condition. Their average alloy composition is basically identical.

For each property being compared, the top bar is EN 1.8550 steel and the bottom bar is EN 1.8509 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 300
340
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11
11
Fatigue Strength, MPa 470
580
Impact Strength: V-Notched Charpy, J 34
29
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 600
680
Tensile Strength: Ultimate (UTS), MPa 1000
1130
Tensile Strength: Yield (Proof), MPa 760
940

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 440
440
Melting Completion (Liquidus), °C 1450
1450
Melting Onset (Solidus), °C 1410
1410
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 40
39
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
7.5
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 3.4
2.8
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.7
1.6
Embodied Energy, MJ/kg 23
22
Embodied Water, L/kg 67
65

Common Calculations

PREN (Pitting Resistance) 2.3
2.6
Resilience: Ultimate (Unit Rupture Work), MJ/m3 100
120
Resilience: Unit (Modulus of Resilience), kJ/m3 1550
2340
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 36
40
Strength to Weight: Bending, points 29
31
Thermal Diffusivity, mm2/s 11
10
Thermal Shock Resistance, points 29
33

Alloy Composition

Aluminum (Al), % 0.8 to 1.2
0.8 to 1.2
Carbon (C), % 0.3 to 0.37
0.38 to 0.45
Chromium (Cr), % 1.5 to 1.8
1.5 to 1.8
Iron (Fe), % 94.4 to 96.3
95.5 to 97.1
Manganese (Mn), % 0.4 to 0.7
0.4 to 0.7
Molybdenum (Mo), % 0.15 to 0.25
0.2 to 0.35
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 0.4
Sulfur (S), % 0 to 0.035
0 to 0.035