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EN 1.8888 Steel vs. EN 1.7706 Steel

Both EN 1.8888 steel and EN 1.7706 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 32 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is EN 1.8888 steel and the bottom bar is EN 1.7706 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 250
210
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 16
17
Fatigue Strength, MPa 470
330
Impact Strength: V-Notched Charpy, J 110
30
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 830
690
Tensile Strength: Yield (Proof), MPa 720
500

Thermal Properties

Latent Heat of Fusion, J/g 260
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 40
40
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.1
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 9.3
8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 3.7
3.7
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.9
2.3
Embodied Energy, MJ/kg 26
32
Embodied Water, L/kg 54
57

Common Calculations

PREN (Pitting Resistance) 2.0
4.7
Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
110
Resilience: Unit (Modulus of Resilience), kJ/m3 1370
670
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 29
24
Strength to Weight: Bending, points 25
22
Thermal Diffusivity, mm2/s 11
11
Thermal Shock Resistance, points 24
20

Alloy Composition

Boron (B), % 0 to 0.0050
0
Carbon (C), % 0 to 0.2
0.15 to 0.2
Chromium (Cr), % 0 to 1.5
1.2 to 1.5
Copper (Cu), % 0 to 0.3
0 to 0.3
Iron (Fe), % 91.9 to 100
94.7 to 97.1
Manganese (Mn), % 0 to 1.7
0.5 to 0.9
Molybdenum (Mo), % 0 to 0.7
0.9 to 1.1
Nickel (Ni), % 0 to 2.5
0 to 0.4
Niobium (Nb), % 0 to 0.060
0
Nitrogen (N), % 0 to 0.015
0
Phosphorus (P), % 0 to 0.020
0 to 0.020
Silicon (Si), % 0 to 0.8
0 to 0.6
Sulfur (S), % 0 to 0.0050
0 to 0.015
Titanium (Ti), % 0 to 0.050
0
Vanadium (V), % 0 to 0.12
0.2 to 0.3
Zirconium (Zr), % 0 to 0.15
0