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EN 1.8515 Steel vs. EN 1.7779 Steel

Both EN 1.8515 steel and EN 1.7779 steel are iron alloys. Both are furnished in the quenched and tempered condition. Their average alloy composition is basically identical.

For each property being compared, the top bar is EN 1.8515 steel and the bottom bar is EN 1.7779 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 340
240
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11
16
Fatigue Strength, MPa 580
430
Impact Strength: V-Notched Charpy, J 29
38
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
73
Shear Strength, MPa 680
500
Tensile Strength: Ultimate (UTS), MPa 1130
810
Tensile Strength: Yield (Proof), MPa 940
660

Thermal Properties

Latent Heat of Fusion, J/g 250
260
Maximum Temperature: Mechanical, °C 470
470
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
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 7.6
7.7
Electrical Conductivity: Equal Weight (Specific), % IACS 8.7
8.9

Otherwise Unclassified Properties

Base Metal Price, % relative 3.5
4.0
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.6
2.8
Embodied Energy, MJ/kg 22
41
Embodied Water, L/kg 60
64

Common Calculations

PREN (Pitting Resistance) 4.4
5.0
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
120
Resilience: Unit (Modulus of Resilience), kJ/m3 2310
1150
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 40
29
Strength to Weight: Bending, points 31
25
Thermal Diffusivity, mm2/s 11
11
Thermal Shock Resistance, points 33
23

Alloy Composition

Aluminum (Al), % 0
0 to 0.040
Carbon (C), % 0.28 to 0.35
0.17 to 0.23
Chromium (Cr), % 2.8 to 3.3
3.0 to 3.3
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 94.7 to 96.5
93.8 to 95.4
Manganese (Mn), % 0.4 to 0.7
0.3 to 0.5
Molybdenum (Mo), % 0.3 to 0.5
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 to 0.4
0.15 to 0.35
Sulfur (S), % 0 to 0.035
0 to 0.010
Vanadium (V), % 0
0.45 to 0.55