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EN 1.7365 Steel vs. EN 1.7779 Steel

Both EN 1.7365 steel and EN 1.7779 steel are iron alloys. Both are furnished in the quenched and tempered condition. They have a very high 98% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is EN 1.7365 steel and the bottom bar is EN 1.7779 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
240
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 18
16
Fatigue Strength, MPa 320
430
Impact Strength: V-Notched Charpy, J 31
38
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
73
Tensile Strength: Ultimate (UTS), MPa 700
810
Tensile Strength: Yield (Proof), MPa 470
660

Thermal Properties

Latent Heat of Fusion, J/g 260
260
Maximum Temperature: Mechanical, °C 510
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 8.2
7.7
Electrical Conductivity: Equal Weight (Specific), % IACS 9.4
8.9

Otherwise Unclassified Properties

Base Metal Price, % relative 4.4
4.0
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.8
2.8
Embodied Energy, MJ/kg 24
41
Embodied Water, L/kg 70
64

Common Calculations

PREN (Pitting Resistance) 6.8
5.0
Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
120
Resilience: Unit (Modulus of Resilience), kJ/m3 580
1150
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 25
29
Strength to Weight: Bending, points 22
25
Thermal Diffusivity, mm2/s 11
11
Thermal Shock Resistance, points 20
23

Alloy Composition

Aluminum (Al), % 0
0 to 0.040
Carbon (C), % 0.12 to 0.19
0.17 to 0.23
Chromium (Cr), % 4.0 to 6.0
3.0 to 3.3
Copper (Cu), % 0 to 0.3
0 to 0.3
Iron (Fe), % 91.2 to 94.9
93.8 to 95.4
Manganese (Mn), % 0.5 to 0.8
0.3 to 0.5
Molybdenum (Mo), % 0.45 to 0.65
0.5 to 0.6
Nickel (Ni), % 0
0 to 0.3
Phosphorus (P), % 0 to 0.025
0 to 0.025
Silicon (Si), % 0 to 0.8
0.15 to 0.35
Sulfur (S), % 0 to 0.025
0 to 0.010
Vanadium (V), % 0 to 0.050
0.45 to 0.55