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EN 1.7710 Steel vs. EN 1.6579 Steel

Both EN 1.7710 steel and EN 1.6579 steel are iron alloys. They have a very high 98% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.7710 steel and the bottom bar is EN 1.6579 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 280 to 320
260 to 290
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 6.8 to 11
11 to 14
Fatigue Strength, MPa 500 to 620
380 to 570
Impact Strength: V-Notched Charpy, J 30
35 to 41
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 930 to 1070
850 to 980
Tensile Strength: Yield (Proof), MPa 800 to 1060
600 to 910

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Maximum Temperature: Mechanical, °C 440
440
Melting Completion (Liquidus), °C 1470
1460
Melting Onset (Solidus), °C 1430
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 41
39
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.5
7.7
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
8.8

Otherwise Unclassified Properties

Base Metal Price, % relative 3.5
3.7
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.2
1.7
Embodied Energy, MJ/kg 30
22
Embodied Water, L/kg 57
56

Common Calculations

PREN (Pitting Resistance) 4.5
2.4
Resilience: Ultimate (Unit Rupture Work), MJ/m3 73 to 100
100 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 1680 to 2970
950 to 2210
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 33 to 38
30 to 35
Strength to Weight: Bending, points 27 to 30
25 to 28
Thermal Diffusivity, mm2/s 11
11
Thermal Shock Resistance, points 27 to 31
25 to 29

Alloy Composition

Carbon (C), % 0.12 to 0.18
0.32 to 0.38
Chromium (Cr), % 1.3 to 1.8
1.4 to 1.7
Iron (Fe), % 95.1 to 97
94.2 to 96.1
Manganese (Mn), % 0.6 to 1.0
0.6 to 1.0
Molybdenum (Mo), % 0.8 to 1.0
0.15 to 0.35
Nickel (Ni), % 0
1.4 to 1.7
Phosphorus (P), % 0 to 0.025
0 to 0.025
Silicon (Si), % 0 to 0.6
0 to 0.6
Sulfur (S), % 0 to 0.030
0 to 0.030
Vanadium (V), % 0.15 to 0.25
0