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EN 1.7729 Steel vs. EN 1.8879 Steel

Both EN 1.7729 steel and EN 1.8879 steel are iron alloys. Both are furnished in the quenched and tempered condition. They have a very high 98% of their average alloy composition in common. There are 33 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 1.7729 steel and the bottom bar is EN 1.8879 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 270
250
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 17
16
Fatigue Strength, MPa 500
460
Impact Strength: V-Notched Charpy, J 46
67
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 560
510
Tensile Strength: Ultimate (UTS), MPa 910
830
Tensile Strength: Yield (Proof), MPa 750
710

Thermal Properties

Latent Heat of Fusion, J/g 250
260
Maximum Temperature: Mechanical, °C 430
420
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 40
40
Thermal Expansion, µm/m-K 13
13

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 3.8
3.7
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.3
1.9
Embodied Energy, MJ/kg 49
26
Embodied Water, L/kg 59
54

Common Calculations

PREN (Pitting Resistance) 4.4
2.0
Resilience: Ultimate (Unit Rupture Work), MJ/m3 150
120
Resilience: Unit (Modulus of Resilience), kJ/m3 1500
1320
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 32
29
Strength to Weight: Bending, points 27
25
Thermal Diffusivity, mm2/s 11
11
Thermal Shock Resistance, points 27
24

Alloy Composition

Aluminum (Al), % 0.015 to 0.080
0
Arsenic (As), % 0 to 0.020
0
Boron (B), % 0.0010 to 0.010
0 to 0.0050
Carbon (C), % 0.17 to 0.23
0 to 0.2
Chromium (Cr), % 0.9 to 1.2
0 to 1.5
Copper (Cu), % 0 to 0.2
0 to 0.3
Iron (Fe), % 94.8 to 97
91.9 to 100
Manganese (Mn), % 0.35 to 0.75
0 to 1.7
Molybdenum (Mo), % 0.9 to 1.1
0 to 0.7
Nickel (Ni), % 0 to 0.2
0 to 2.5
Niobium (Nb), % 0
0 to 0.060
Nitrogen (N), % 0
0 to 0.015
Phosphorus (P), % 0 to 0.020
0 to 0.025
Silicon (Si), % 0 to 0.4
0 to 0.8
Sulfur (S), % 0 to 0.015
0 to 0.010
Tin (Sn), % 0 to 0.020
0
Titanium (Ti), % 0.070 to 0.15
0 to 0.050
Vanadium (V), % 0.6 to 0.8
0 to 0.12
Zirconium (Zr), % 0
0 to 0.15