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EN 1.7707 Steel vs. EN 1.8503 Steel

Both EN 1.7707 steel and EN 1.8503 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.

For each property being compared, the top bar is EN 1.7707 steel and the bottom bar is EN 1.8503 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 300
300
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11
16
Fatigue Strength, MPa 500
600
Impact Strength: V-Notched Charpy, J 31
39
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 600
610
Tensile Strength: Ultimate (UTS), MPa 1010
1000
Tensile Strength: Yield (Proof), MPa 800
910

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 460
440
Melting Completion (Liquidus), °C 1460
1470
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 39
41
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.7
8.5

Otherwise Unclassified Properties

Base Metal Price, % relative 3.3
3.3
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.9
2.3
Embodied Energy, MJ/kg 27
33
Embodied Water, L/kg 58
57

Common Calculations

PREN (Pitting Resistance) 3.2
3.7
Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
150
Resilience: Unit (Modulus of Resilience), kJ/m3 1690
2200
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 36
35
Strength to Weight: Bending, points 29
28
Thermal Diffusivity, mm2/s 11
11
Thermal Shock Resistance, points 29
29

Alloy Composition

Aluminum (Al), % 0
0 to 0.3
Carbon (C), % 0.26 to 0.34
0.16 to 0.24
Chromium (Cr), % 2.3 to 2.7
1.2 to 1.5
Iron (Fe), % 94.7 to 96.8
95.8 to 97.5
Manganese (Mn), % 0.4 to 0.7
0.4 to 0.8
Molybdenum (Mo), % 0.15 to 0.25
0.65 to 0.8
Nickel (Ni), % 0 to 0.6
0
Phosphorus (P), % 0 to 0.035
0 to 0.025
Silicon (Si), % 0 to 0.4
0 to 0.4
Sulfur (S), % 0 to 0.035
0 to 0.035
Vanadium (V), % 0.1 to 0.2
0.25 to 0.35