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EN 1.1181 +QT Steel vs. EN 1.7225 +QT Steel

Both EN 1.1181 +QT steel and EN 1.7225 +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.

For each property being compared, the top bar is EN 1.1181 +QT steel and the bottom bar is EN 1.7225 +QT steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
300
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 20
13
Fatigue Strength, MPa 260
480
Impact Strength: V-Notched Charpy, J 38
35
Poisson's Ratio 0.29
0.29
Reduction in Area, % 51
56
Rockwell C Hardness 53
57
Shear Modulus, GPa 73
73
Shear Strength, MPa 390
590
Tensile Strength: Ultimate (UTS), MPa 620
990
Tensile Strength: Yield (Proof), MPa 380
760

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
1420
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
2.5
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
1.5
Embodied Energy, MJ/kg 19
20
Embodied Water, L/kg 47
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
120
Resilience: Unit (Modulus of Resilience), kJ/m3 380
1530
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 22
35
Strength to Weight: Bending, points 21
28
Thermal Diffusivity, mm2/s 11
12
Thermal Shock Resistance, points 21
29

Alloy Composition

Carbon (C), % 0.32 to 0.39
0.38 to 0.45
Chromium (Cr), % 0 to 0.4
0.9 to 1.2
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 97.4 to 99.18
96.6 to 98
Manganese (Mn), % 0.5 to 0.8
0.6 to 0.9
Molybdenum (Mo), % 0 to 0.1
0.15 to 0.3
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