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EN 1.7228 Steel vs. EN 1.7706 Steel

Both EN 1.7228 steel and EN 1.7706 steel are iron alloys. Both are furnished in the quenched and tempered condition. They have a very high 98% of their average alloy composition in common. There are 31 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 1.7228 steel and the bottom bar is EN 1.7706 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 270
210
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 12
17
Fatigue Strength, MPa 390
330
Impact Strength: V-Notched Charpy, J 22
30
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 900
690
Tensile Strength: Yield (Proof), MPa 630
500

Thermal Properties

Latent Heat of Fusion, J/g 250
260
Maximum Temperature: Mechanical, °C 420
440
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 46
40
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 2.5
3.7
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.5
2.3
Embodied Energy, MJ/kg 20
32
Embodied Water, L/kg 51
57

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 100
110
Resilience: Unit (Modulus of Resilience), kJ/m3 1050
670
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 32
24
Strength to Weight: Bending, points 26
22
Thermal Diffusivity, mm2/s 12
11
Thermal Shock Resistance, points 26
20

Alloy Composition

Carbon (C), % 0.46 to 0.54
0.15 to 0.2
Chromium (Cr), % 0.9 to 1.2
1.2 to 1.5
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 96.7 to 98
94.7 to 97.1
Manganese (Mn), % 0.5 to 0.8
0.5 to 0.9
Molybdenum (Mo), % 0.15 to 0.3
0.9 to 1.1
Nickel (Ni), % 0
0 to 0.4
Phosphorus (P), % 0 to 0.035
0 to 0.020
Silicon (Si), % 0 to 0.4
0 to 0.6
Sulfur (S), % 0 to 0.035
0 to 0.015
Vanadium (V), % 0
0.2 to 0.3