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EN 1.7715 Steel vs. EN 1.7779 Steel

Both EN 1.7715 steel and EN 1.7779 steel are iron alloys. They have a very high 97% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.7715 steel and the bottom bar is EN 1.7779 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
240
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 21
16
Fatigue Strength, MPa 240
430
Impact Strength: V-Notched Charpy, J 34
38
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 340
500
Tensile Strength: Ultimate (UTS), MPa 540
810
Tensile Strength: Yield (Proof), MPa 340
660

Thermal Properties

Latent Heat of Fusion, J/g 250
260
Maximum Temperature: Mechanical, °C 420
470
Melting Completion (Liquidus), °C 1470
1460
Melting Onset (Solidus), °C 1430
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 40
39
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
7.7
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
8.9

Otherwise Unclassified Properties

Base Metal Price, % relative 2.9
4.0
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 2.2
2.8
Embodied Energy, MJ/kg 30
41
Embodied Water, L/kg 52
64

Common Calculations

PREN (Pitting Resistance) 2.4
5.0
Resilience: Ultimate (Unit Rupture Work), MJ/m3 99
120
Resilience: Unit (Modulus of Resilience), kJ/m3 320
1150
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 19
29
Strength to Weight: Bending, points 19
25
Thermal Diffusivity, mm2/s 11
11
Thermal Shock Resistance, points 16
23

Alloy Composition

Aluminum (Al), % 0 to 0.040
0 to 0.040
Carbon (C), % 0.1 to 0.15
0.17 to 0.23
Chromium (Cr), % 0.3 to 0.6
3.0 to 3.3
Copper (Cu), % 0 to 0.3
0 to 0.3
Iron (Fe), % 96.5 to 98.3
93.8 to 95.4
Manganese (Mn), % 0.4 to 0.7
0.3 to 0.5
Molybdenum (Mo), % 0.5 to 0.7
0.5 to 0.6
Nickel (Ni), % 0 to 0.3
0 to 0.3
Phosphorus (P), % 0 to 0.025
0 to 0.025
Silicon (Si), % 0.15 to 0.35
0.15 to 0.35
Sulfur (S), % 0 to 0.010
0 to 0.010
Vanadium (V), % 0.22 to 0.28
0.45 to 0.55