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EN 1.8527 Steel vs. EN 1.8550 Steel

Both EN 1.8527 steel and EN 1.8550 steel are iron alloys. Both are furnished in the quenched and tempered condition. They have a very high 97% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.8527 steel and the bottom bar is EN 1.8550 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 270
300
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 16
11
Fatigue Strength, MPa 520
470
Impact Strength: V-Notched Charpy, J 39
34
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
73
Shear Strength, MPa 550
600
Tensile Strength: Ultimate (UTS), MPa 900
1000
Tensile Strength: Yield (Proof), MPa 800
760

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Maximum Temperature: Mechanical, °C 490
440
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 41
40
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 9.0
8.8

Otherwise Unclassified Properties

Base Metal Price, % relative 4.0
3.4
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.7
1.7
Embodied Energy, MJ/kg 23
23
Embodied Water, L/kg 66
67

Common Calculations

PREN (Pitting Resistance) 5.7
2.3
Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
100
Resilience: Unit (Modulus of Resilience), kJ/m3 1670
1550
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 32
36
Strength to Weight: Bending, points 26
29
Thermal Diffusivity, mm2/s 11
11
Thermal Shock Resistance, points 26
29

Alloy Composition

Aluminum (Al), % 0
0.8 to 1.2
Carbon (C), % 0.040 to 0.12
0.3 to 0.37
Chromium (Cr), % 3.7 to 4.3
1.5 to 1.8
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 93.2 to 95.1
94.4 to 96.3
Manganese (Mn), % 0.85 to 1.2
0.4 to 0.7
Molybdenum (Mo), % 0.4 to 0.6
0.15 to 0.25
Nickel (Ni), % 0
0.85 to 1.2
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