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EN 1.6771 Steel vs. EN 1.7379 Steel

Both EN 1.6771 steel and EN 1.7379 steel are iron alloys. They have a very high 96% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.6771 steel and the bottom bar is EN 1.7379 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 280 to 350
200
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 8.0 to 8.7
21
Fatigue Strength, MPa 440 to 680
320
Impact Strength: V-Notched Charpy, J 20 to 32
45
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
74
Tensile Strength: Ultimate (UTS), MPa 930 to 1180
670
Tensile Strength: Yield (Proof), MPa 740 to 1140
460

Thermal Properties

Latent Heat of Fusion, J/g 250
260
Maximum Temperature: Mechanical, °C 440
460
Melting Completion (Liquidus), °C 1460
1470
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 46
39
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.0
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 9.2
8.8

Otherwise Unclassified Properties

Base Metal Price, % relative 5.0
3.8
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.9
1.8
Embodied Energy, MJ/kg 25
23
Embodied Water, L/kg 58
59

Common Calculations

PREN (Pitting Resistance) 2.5
5.7
Resilience: Ultimate (Unit Rupture Work), MJ/m3 75 to 93
120
Resilience: Unit (Modulus of Resilience), kJ/m3 1460 to 3450
550
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 33 to 41
24
Strength to Weight: Bending, points 27 to 31
22
Thermal Diffusivity, mm2/s 13
11
Thermal Shock Resistance, points 27 to 35
19

Alloy Composition

Carbon (C), % 0.27 to 0.33
0.13 to 0.2
Chromium (Cr), % 0.8 to 1.2
2.0 to 2.5
Iron (Fe), % 92.2 to 95
94.5 to 96.5
Manganese (Mn), % 0.6 to 1.0
0.5 to 0.9
Molybdenum (Mo), % 0.3 to 0.6
0.9 to 1.2
Nickel (Ni), % 3.0 to 4.0
0
Phosphorus (P), % 0 to 0.030
0 to 0.025
Silicon (Si), % 0 to 0.6
0 to 0.6
Sulfur (S), % 0 to 0.020
0 to 0.030