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EN 1.7380 Steel vs. EN 1.8550 Steel

Both EN 1.7380 steel and EN 1.8550 steel are iron alloys. They have a very high 98% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.7380 steel and the bottom bar is EN 1.8550 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 170
300
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 19 to 20
11
Fatigue Strength, MPa 200 to 230
470
Impact Strength: V-Notched Charpy, J 31 to 35
34
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
73
Shear Strength, MPa 330 to 350
600
Tensile Strength: Ultimate (UTS), MPa 540 to 550
1000
Tensile Strength: Yield (Proof), MPa 290 to 330
760

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Maximum Temperature: Mechanical, °C 460
440
Melting Completion (Liquidus), °C 1470
1450
Melting Onset (Solidus), °C 1430
1410
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 39
40
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 8.7
8.8

Otherwise Unclassified Properties

Base Metal Price, % relative 3.8
3.4
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.8
1.7
Embodied Energy, MJ/kg 23
23
Embodied Water, L/kg 59
67

Common Calculations

PREN (Pitting Resistance) 5.6
2.3
Resilience: Ultimate (Unit Rupture Work), MJ/m3 87 to 98
100
Resilience: Unit (Modulus of Resilience), kJ/m3 230 to 280
1550
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 19 to 20
36
Strength to Weight: Bending, points 19
29
Thermal Diffusivity, mm2/s 11
11
Thermal Shock Resistance, points 15 to 16
29

Alloy Composition

Aluminum (Al), % 0
0.8 to 1.2
Carbon (C), % 0.080 to 0.14
0.3 to 0.37
Chromium (Cr), % 2.0 to 2.5
1.5 to 1.8
Copper (Cu), % 0 to 0.3
0
Iron (Fe), % 94.6 to 96.6
94.4 to 96.3
Manganese (Mn), % 0.4 to 0.8
0.4 to 0.7
Molybdenum (Mo), % 0.9 to 1.1
0.15 to 0.25
Nickel (Ni), % 0
0.85 to 1.2
Nitrogen (N), % 0 to 0.012
0
Phosphorus (P), % 0 to 0.020
0 to 0.025
Silicon (Si), % 0 to 0.5
0 to 0.4
Sulfur (S), % 0 to 0.010
0 to 0.035