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EN 1.8550 Steel vs. EN 1.7386 Steel

Both EN 1.8550 steel and EN 1.7386 steel are iron alloys. They have a moderately high 91% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.8550 steel and the bottom bar is EN 1.7386 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 300
170 to 200
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11
18 to 21
Fatigue Strength, MPa 470
170 to 290
Impact Strength: V-Notched Charpy, J 34
38
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
75
Shear Strength, MPa 600
340 to 410
Tensile Strength: Ultimate (UTS), MPa 1000
550 to 670
Tensile Strength: Yield (Proof), MPa 760
240 to 440

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Maximum Temperature: Mechanical, °C 440
600
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
26
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
9.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
10

Otherwise Unclassified Properties

Base Metal Price, % relative 3.4
6.5
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.7
2.0
Embodied Energy, MJ/kg 23
28
Embodied Water, L/kg 67
88

Common Calculations

PREN (Pitting Resistance) 2.3
12
Resilience: Ultimate (Unit Rupture Work), MJ/m3 100
92 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 1550
150 to 490
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 36
20 to 24
Strength to Weight: Bending, points 29
19 to 22
Thermal Diffusivity, mm2/s 11
6.9
Thermal Shock Resistance, points 29
15 to 18

Alloy Composition

Aluminum (Al), % 0.8 to 1.2
0 to 0.040
Carbon (C), % 0.3 to 0.37
0.080 to 0.15
Chromium (Cr), % 1.5 to 1.8
8.0 to 10
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 94.4 to 96.3
86.8 to 90.5
Manganese (Mn), % 0.4 to 0.7
0.3 to 0.6
Molybdenum (Mo), % 0.15 to 0.25
0.9 to 1.1
Nickel (Ni), % 0.85 to 1.2
0
Phosphorus (P), % 0 to 0.025
0 to 0.025
Silicon (Si), % 0 to 0.4
0.25 to 1.0
Sulfur (S), % 0 to 0.035
0 to 0.010