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EN 1.7729 Steel vs. EN 1.5681 Steel

Both EN 1.7729 steel and EN 1.5681 steel are iron alloys. Both are furnished in the quenched and tempered condition. They have a moderately high 95% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is EN 1.7729 steel and the bottom bar is EN 1.5681 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 270
190
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 17
20
Fatigue Strength, MPa 500
300
Impact Strength: V-Notched Charpy, J 46
110
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 910
630
Tensile Strength: Yield (Proof), MPa 750
430

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 430
420
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
48
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
7.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.7
9.0

Otherwise Unclassified Properties

Base Metal Price, % relative 3.8
5.0
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 3.3
1.9
Embodied Energy, MJ/kg 49
25
Embodied Water, L/kg 59
55

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 150
110
Resilience: Unit (Modulus of Resilience), kJ/m3 1500
490
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 32
22
Strength to Weight: Bending, points 27
21
Thermal Diffusivity, mm2/s 11
13
Thermal Shock Resistance, points 27
19

Alloy Composition

Aluminum (Al), % 0.015 to 0.080
0
Arsenic (As), % 0 to 0.020
0
Boron (B), % 0.0010 to 0.010
0
Carbon (C), % 0.17 to 0.23
0.060 to 0.12
Chromium (Cr), % 0.9 to 1.2
0
Copper (Cu), % 0 to 0.2
0
Iron (Fe), % 94.8 to 97
92.9 to 94.9
Manganese (Mn), % 0.35 to 0.75
0.5 to 0.8
Molybdenum (Mo), % 0.9 to 1.1
0
Nickel (Ni), % 0 to 0.2
4.5 to 5.5
Phosphorus (P), % 0 to 0.020
0 to 0.020
Silicon (Si), % 0 to 0.4
0 to 0.6
Sulfur (S), % 0 to 0.015
0 to 0.020
Tin (Sn), % 0 to 0.020
0
Titanium (Ti), % 0.070 to 0.15
0
Vanadium (V), % 0.6 to 0.8
0