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EN 1.8515 Steel vs. EN 1.6956 Steel

Both EN 1.8515 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 1.8515 steel and the bottom bar is EN 1.6956 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 340
370
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11
9.6
Fatigue Strength, MPa 580
680
Impact Strength: V-Notched Charpy, J 29
25
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
73
Shear Strength, MPa 680
730
Tensile Strength: Ultimate (UTS), MPa 1130
1230
Tensile Strength: Yield (Proof), MPa 940
1120

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 470
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 7.6
8.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.7
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 3.5
5.0
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.6
2.2
Embodied Energy, MJ/kg 22
31
Embodied Water, L/kg 60
60

Common Calculations

PREN (Pitting Resistance) 4.4
2.8
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
110
Resilience: Unit (Modulus of Resilience), kJ/m3 2310
3320
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 40
43
Strength to Weight: Bending, points 31
32
Thermal Diffusivity, mm2/s 11
12
Thermal Shock Resistance, points 33
36

Alloy Composition

Carbon (C), % 0.28 to 0.35
0.28 to 0.38
Chromium (Cr), % 2.8 to 3.3
1.0 to 1.7
Iron (Fe), % 94.7 to 96.5
92.4 to 95.3
Manganese (Mn), % 0.4 to 0.7
0.15 to 0.4
Molybdenum (Mo), % 0.3 to 0.5
0.3 to 0.6
Nickel (Ni), % 0 to 0.3
2.9 to 3.8
Phosphorus (P), % 0 to 0.025
0 to 0.035
Silicon (Si), % 0 to 0.4
0 to 0.4
Sulfur (S), % 0 to 0.035
0 to 0.035
Vanadium (V), % 0
0.080 to 0.25