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EN 1.7703 Steel vs. EN 1.7779 Steel

Both EN 1.7703 steel and EN 1.7779 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 1.7703 steel and the bottom bar is EN 1.7779 steel.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

Latent Heat of Fusion, J/g 250
260
Maximum Temperature: Mechanical, °C 460
470
Melting Completion (Liquidus), °C 1470
1460
Melting Onset (Solidus), °C 1430
1420
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 7.6
7.7
Electrical Conductivity: Equal Weight (Specific), % IACS 8.7
8.9

Otherwise Unclassified Properties

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

Common Calculations

PREN (Pitting Resistance) 5.6
5.0
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120 to 130
120
Resilience: Unit (Modulus of Resilience), kJ/m3 570 to 650
1150
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 24
29
Strength to Weight: Bending, points 22
25
Thermal Diffusivity, mm2/s 11
11
Thermal Shock Resistance, points 19 to 20
23

Alloy Composition

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