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EN 1.7706 Steel vs. EN 1.6771 Steel

Both EN 1.7706 steel and EN 1.6771 steel are iron alloys. They have a very high 96% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.7706 steel and the bottom bar is EN 1.6771 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
280 to 350
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 17
8.0 to 8.7
Fatigue Strength, MPa 330
440 to 680
Impact Strength: V-Notched Charpy, J 30
20 to 32
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 690
930 to 1180
Tensile Strength: Yield (Proof), MPa 500
740 to 1140

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
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 40
46
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
8.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.7
9.2

Otherwise Unclassified Properties

Base Metal Price, % relative 3.7
5.0
Density, g/cm3 7.9
7.9
Embodied Carbon, kg CO2/kg material 2.3
1.9
Embodied Energy, MJ/kg 32
25
Embodied Water, L/kg 57
58

Common Calculations

PREN (Pitting Resistance) 4.7
2.5
Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
75 to 93
Resilience: Unit (Modulus of Resilience), kJ/m3 670
1460 to 3450
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 24
33 to 41
Strength to Weight: Bending, points 22
27 to 31
Thermal Diffusivity, mm2/s 11
13
Thermal Shock Resistance, points 20
27 to 35

Alloy Composition

Carbon (C), % 0.15 to 0.2
0.27 to 0.33
Chromium (Cr), % 1.2 to 1.5
0.8 to 1.2
Copper (Cu), % 0 to 0.3
0
Iron (Fe), % 94.7 to 97.1
92.2 to 95
Manganese (Mn), % 0.5 to 0.9
0.6 to 1.0
Molybdenum (Mo), % 0.9 to 1.1
0.3 to 0.6
Nickel (Ni), % 0 to 0.4
3.0 to 4.0
Phosphorus (P), % 0 to 0.020
0 to 0.030
Silicon (Si), % 0 to 0.6
0 to 0.6
Sulfur (S), % 0 to 0.015
0 to 0.020
Vanadium (V), % 0.2 to 0.3
0