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EN 1.1181 +QT Steel vs. EN 1.8159 +QT Steel

Both EN 1.1181 +QT steel and EN 1.8159 +QT steel are iron alloys. Both are furnished in the quenched and tempered condition. They have a very high 99% of their average alloy composition in common. There are 33 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 +QT steel and the bottom bar is EN 1.8159 +QT steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
360
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 20
11
Fatigue Strength, MPa 260
620
Impact Strength: V-Notched Charpy, J 38
26
Poisson's Ratio 0.29
0.29
Reduction in Area, % 51
34
Shear Modulus, GPa 73
73
Shear Strength, MPa 390
710
Tensile Strength: Ultimate (UTS), MPa 620
1200
Tensile Strength: Yield (Proof), MPa 380
1010

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 400
420
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 42
46
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 2.1
2.3
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
1.9
Embodied Energy, MJ/kg 19
26
Embodied Water, L/kg 47
52

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
120
Resilience: Unit (Modulus of Resilience), kJ/m3 380
2740
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 22
43
Strength to Weight: Bending, points 21
32
Thermal Diffusivity, mm2/s 11
13
Thermal Shock Resistance, points 21
35

Alloy Composition

Carbon (C), % 0.32 to 0.39
0.47 to 0.55
Chromium (Cr), % 0 to 0.4
0.9 to 1.2
Iron (Fe), % 97.4 to 99.18
96.4 to 97.8
Manganese (Mn), % 0.5 to 0.8
0.7 to 1.1
Molybdenum (Mo), % 0 to 0.1
0
Nickel (Ni), % 0 to 0.4
0
Phosphorus (P), % 0 to 0.035
0 to 0.035
Silicon (Si), % 0 to 0.4
0 to 0.4
Sulfur (S), % 0 to 0.035
0 to 0.035
Vanadium (V), % 0
0.1 to 0.25