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EN 1.7779 Steel vs. EN 1.7703 Steel

Both EN 1.7779 steel and EN 1.7703 steel are iron alloys. They have a very high 99% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.7779 steel and the bottom bar is EN 1.7703 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 240
200 to 210
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 16
20
Fatigue Strength, MPa 430
320 to 340
Impact Strength: V-Notched Charpy, J 38
46
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
74
Shear Strength, MPa 500
420 to 430
Tensile Strength: Ultimate (UTS), MPa 810
670 to 690
Tensile Strength: Yield (Proof), MPa 660
460 to 500

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Maximum Temperature: Mechanical, °C 470
460
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 39
39
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.7
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 8.9
8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 4.0
4.2
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 2.8
2.5
Embodied Energy, MJ/kg 41
35
Embodied Water, L/kg 64
61

Common Calculations

PREN (Pitting Resistance) 5.0
5.6
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
120 to 130
Resilience: Unit (Modulus of Resilience), kJ/m3 1150
570 to 650
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 23
19 to 20

Alloy Composition

Aluminum (Al), % 0 to 0.040
0
Carbon (C), % 0.17 to 0.23
0.11 to 0.15
Chromium (Cr), % 3.0 to 3.3
2.0 to 2.5
Copper (Cu), % 0 to 0.3
0 to 0.2
Iron (Fe), % 93.8 to 95.4
94.6 to 96.4
Manganese (Mn), % 0.3 to 0.5
0.3 to 0.6
Molybdenum (Mo), % 0.5 to 0.6
0.9 to 1.1
Nickel (Ni), % 0 to 0.3
0 to 0.25
Niobium (Nb), % 0
0 to 0.070
Nitrogen (N), % 0
0 to 0.012
Phosphorus (P), % 0 to 0.025
0 to 0.015
Silicon (Si), % 0.15 to 0.35
0 to 0.1
Sulfur (S), % 0 to 0.010
0 to 0.0050
Titanium (Ti), % 0
0 to 0.030
Vanadium (V), % 0.45 to 0.55
0.25 to 0.35