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EN 1.7779 Steel vs. EN 1.8881 Steel

Both EN 1.7779 steel and EN 1.8881 steel are iron alloys. Both are furnished in the quenched and tempered condition. They have a very high 97% 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 1.8881 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 240
250
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 16
16
Fatigue Strength, MPa 430
460
Impact Strength: V-Notched Charpy, J 38
90
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 500
510
Tensile Strength: Ultimate (UTS), MPa 810
830
Tensile Strength: Yield (Proof), MPa 660
710

Thermal Properties

Latent Heat of Fusion, J/g 260
260
Maximum Temperature: Mechanical, °C 470
420
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
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 7.7
8.1
Electrical Conductivity: Equal Weight (Specific), % IACS 8.9
9.3

Otherwise Unclassified Properties

Base Metal Price, % relative 4.0
3.7
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.8
1.9
Embodied Energy, MJ/kg 41
26
Embodied Water, L/kg 64
54

Common Calculations

PREN (Pitting Resistance) 5.0
2.0
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
120
Resilience: Unit (Modulus of Resilience), kJ/m3 1150
1320
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 29
29
Strength to Weight: Bending, points 25
25
Thermal Diffusivity, mm2/s 11
11
Thermal Shock Resistance, points 23
24

Alloy Composition

Aluminum (Al), % 0 to 0.040
0
Boron (B), % 0
0 to 0.0050
Carbon (C), % 0.17 to 0.23
0 to 0.2
Chromium (Cr), % 3.0 to 3.3
0 to 1.5
Copper (Cu), % 0 to 0.3
0 to 0.3
Iron (Fe), % 93.8 to 95.4
91.9 to 100
Manganese (Mn), % 0.3 to 0.5
0 to 1.7
Molybdenum (Mo), % 0.5 to 0.6
0 to 0.7
Nickel (Ni), % 0 to 0.3
0 to 2.5
Niobium (Nb), % 0
0 to 0.060
Nitrogen (N), % 0
0 to 0.015
Phosphorus (P), % 0 to 0.025
0 to 0.020
Silicon (Si), % 0.15 to 0.35
0 to 0.8
Sulfur (S), % 0 to 0.010
0 to 0.0080
Titanium (Ti), % 0
0 to 0.050
Vanadium (V), % 0.45 to 0.55
0 to 0.12
Zirconium (Zr), % 0
0 to 0.15