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EN 1.7365 Steel vs. EN 1.7720 Steel

Both EN 1.7365 steel and EN 1.7720 steel are iron alloys. Both are furnished in the quenched and tempered condition. They have a very high 95% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.7365 steel and the bottom bar is EN 1.7720 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
180
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 18
19
Fatigue Strength, MPa 320
230
Impact Strength: V-Notched Charpy, J 31
30
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
73
Tensile Strength: Ultimate (UTS), MPa 700
590
Tensile Strength: Yield (Proof), MPa 470
340

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Maximum Temperature: Mechanical, °C 510
410
Melting Completion (Liquidus), °C 1460
1470
Melting Onset (Solidus), °C 1420
1430
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 40
40
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.2
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 9.4
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 4.4
2.8
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.8
2.2
Embodied Energy, MJ/kg 24
30
Embodied Water, L/kg 70
51

Common Calculations

PREN (Pitting Resistance) 6.8
2.1
Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
97
Resilience: Unit (Modulus of Resilience), kJ/m3 580
300
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 25
21
Strength to Weight: Bending, points 22
20
Thermal Diffusivity, mm2/s 11
11
Thermal Shock Resistance, points 20
17

Alloy Composition

Carbon (C), % 0.12 to 0.19
0.1 to 0.15
Chromium (Cr), % 4.0 to 6.0
0.3 to 0.5
Copper (Cu), % 0 to 0.3
0 to 0.3
Iron (Fe), % 91.2 to 94.9
96.6 to 98.6
Manganese (Mn), % 0.5 to 0.8
0.4 to 0.7
Molybdenum (Mo), % 0.45 to 0.65
0.4 to 0.6
Nickel (Ni), % 0
0 to 0.4
Phosphorus (P), % 0 to 0.025
0 to 0.030
Silicon (Si), % 0 to 0.8
0 to 0.45
Sulfur (S), % 0 to 0.025
0 to 0.020
Vanadium (V), % 0 to 0.050
0.22 to 0.3