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EN 1.1181 Steel vs. EN 1.7729 Steel

Both EN 1.1181 steel and EN 1.7729 steel are iron alloys. They have a very high 97% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is EN 1.1181 steel and the bottom bar is EN 1.7729 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 180
270
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 19 to 20
17
Fatigue Strength, MPa 190 to 260
500
Impact Strength: V-Notched Charpy, J 23 to 38
46
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 350 to 390
560
Tensile Strength: Ultimate (UTS), MPa 560 to 620
910
Tensile Strength: Yield (Proof), MPa 280 to 380
750

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 400
430
Melting Completion (Liquidus), °C 1460
1470
Melting Onset (Solidus), °C 1420
1430
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 42
40
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 2.1
3.8
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
3.3
Embodied Energy, MJ/kg 19
49
Embodied Water, L/kg 47
59

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 90 to 110
150
Resilience: Unit (Modulus of Resilience), kJ/m3 210 to 380
1500
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 20 to 22
32
Strength to Weight: Bending, points 19 to 21
27
Thermal Diffusivity, mm2/s 11
11
Thermal Shock Resistance, points 19 to 21
27

Alloy Composition

Aluminum (Al), % 0
0.015 to 0.080
Arsenic (As), % 0
0 to 0.020
Boron (B), % 0
0.0010 to 0.010
Carbon (C), % 0.32 to 0.39
0.17 to 0.23
Chromium (Cr), % 0 to 0.4
0.9 to 1.2
Copper (Cu), % 0
0 to 0.2
Iron (Fe), % 97.4 to 99.18
94.8 to 97
Manganese (Mn), % 0.5 to 0.8
0.35 to 0.75
Molybdenum (Mo), % 0 to 0.1
0.9 to 1.1
Nickel (Ni), % 0 to 0.4
0 to 0.2
Phosphorus (P), % 0 to 0.035
0 to 0.020
Silicon (Si), % 0 to 0.4
0 to 0.4
Sulfur (S), % 0 to 0.035
0 to 0.015
Tin (Sn), % 0
0 to 0.020
Titanium (Ti), % 0
0.070 to 0.15
Vanadium (V), % 0
0.6 to 0.8