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EN 1.8879 Steel vs. EN 1.6956 Steel

Both EN 1.8879 steel and EN 1.6956 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 1.8879 steel and the bottom bar is EN 1.6956 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 250
370
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 16
9.6
Fatigue Strength, MPa 460
680
Impact Strength: V-Notched Charpy, J 67
25
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 510
730
Tensile Strength: Ultimate (UTS), MPa 830
1230
Tensile Strength: Yield (Proof), MPa 710
1120

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Maximum Temperature: Mechanical, °C 420
440
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 40
46
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.1
8.0
Electrical Conductivity: Equal Weight (Specific), % IACS 9.3
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 3.7
5.0
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.9
2.2
Embodied Energy, MJ/kg 26
31
Embodied Water, L/kg 54
60

Common Calculations

PREN (Pitting Resistance) 2.0
2.8
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
110
Resilience: Unit (Modulus of Resilience), kJ/m3 1320
3320
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 29
43
Strength to Weight: Bending, points 25
32
Thermal Diffusivity, mm2/s 11
12
Thermal Shock Resistance, points 24
36

Alloy Composition

Boron (B), % 0 to 0.0050
0
Carbon (C), % 0 to 0.2
0.28 to 0.38
Chromium (Cr), % 0 to 1.5
1.0 to 1.7
Copper (Cu), % 0 to 0.3
0
Iron (Fe), % 91.9 to 100
92.4 to 95.3
Manganese (Mn), % 0 to 1.7
0.15 to 0.4
Molybdenum (Mo), % 0 to 0.7
0.3 to 0.6
Nickel (Ni), % 0 to 2.5
2.9 to 3.8
Niobium (Nb), % 0 to 0.060
0
Nitrogen (N), % 0 to 0.015
0
Phosphorus (P), % 0 to 0.025
0 to 0.035
Silicon (Si), % 0 to 0.8
0 to 0.4
Sulfur (S), % 0 to 0.010
0 to 0.035
Titanium (Ti), % 0 to 0.050
0
Vanadium (V), % 0 to 0.12
0.080 to 0.25
Zirconium (Zr), % 0 to 0.15
0