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EN 1.8505 Steel vs. EN 1.7707 Steel

Both EN 1.8505 steel and EN 1.7707 steel are iron alloys. Both are furnished in the quenched and tempered condition. They have a very high 99% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.8505 steel and the bottom bar is EN 1.7707 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 320
300
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 13
11
Fatigue Strength, MPa 540
500
Impact Strength: V-Notched Charpy, J 28
31
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 630
600
Tensile Strength: Ultimate (UTS), MPa 1050
1010
Tensile Strength: Yield (Proof), MPa 860
800

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 440
460
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 39
39
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.5
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 8.7
8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 2.8
3.3
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.6
1.9
Embodied Energy, MJ/kg 22
27
Embodied Water, L/kg 65
58

Common Calculations

PREN (Pitting Resistance) 2.6
3.2
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
110
Resilience: Unit (Modulus of Resilience), kJ/m3 1950
1690
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 37
36
Strength to Weight: Bending, points 30
29
Thermal Diffusivity, mm2/s 11
11
Thermal Shock Resistance, points 31
29

Alloy Composition

Aluminum (Al), % 0.8 to 1.2
0
Carbon (C), % 0.28 to 0.35
0.26 to 0.34
Chromium (Cr), % 1.5 to 1.8
2.3 to 2.7
Iron (Fe), % 95.4 to 97.1
94.7 to 96.8
Manganese (Mn), % 0.4 to 0.7
0.4 to 0.7
Molybdenum (Mo), % 0.2 to 0.4
0.15 to 0.25
Nickel (Ni), % 0
0 to 0.6
Phosphorus (P), % 0 to 0.025
0 to 0.035
Silicon (Si), % 0 to 0.4
0 to 0.4
Sulfur (S), % 0 to 0.035
0 to 0.035
Vanadium (V), % 0
0.1 to 0.2