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EN 1.7379 Steel vs. EN 1.7706 Steel

Both EN 1.7379 steel and EN 1.7706 steel are iron alloys. Both are furnished in the quenched and tempered condition. Their average alloy composition is basically identical.

For each property being compared, the top bar is EN 1.7379 steel and the bottom bar is EN 1.7706 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
210
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 21
17
Fatigue Strength, MPa 320
330
Impact Strength: V-Notched Charpy, J 45
30
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
73
Tensile Strength: Ultimate (UTS), MPa 670
690
Tensile Strength: Yield (Proof), MPa 460
500

Thermal Properties

Latent Heat of Fusion, J/g 260
260
Maximum Temperature: Mechanical, °C 460
440
Melting Completion (Liquidus), °C 1470
1470
Melting Onset (Solidus), °C 1420
1430
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 39
40
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 3.8
3.7
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.8
2.3
Embodied Energy, MJ/kg 23
32
Embodied Water, L/kg 59
57

Common Calculations

PREN (Pitting Resistance) 5.7
4.7
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
110
Resilience: Unit (Modulus of Resilience), kJ/m3 550
670
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 24
24
Strength to Weight: Bending, points 22
22
Thermal Diffusivity, mm2/s 11
11
Thermal Shock Resistance, points 19
20

Alloy Composition

Carbon (C), % 0.13 to 0.2
0.15 to 0.2
Chromium (Cr), % 2.0 to 2.5
1.2 to 1.5
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 94.5 to 96.5
94.7 to 97.1
Manganese (Mn), % 0.5 to 0.9
0.5 to 0.9
Molybdenum (Mo), % 0.9 to 1.2
0.9 to 1.1
Nickel (Ni), % 0
0 to 0.4
Phosphorus (P), % 0 to 0.025
0 to 0.020
Silicon (Si), % 0 to 0.6
0 to 0.6
Sulfur (S), % 0 to 0.030
0 to 0.015
Vanadium (V), % 0
0.2 to 0.3