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EN 1.8888 Steel vs. EN 1.6311 Steel

Both EN 1.8888 steel and EN 1.6311 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.

For each property being compared, the top bar is EN 1.8888 steel and the bottom bar is EN 1.6311 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 250
200
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 16
19
Fatigue Strength, MPa 470
340
Impact Strength: V-Notched Charpy, J 110
51
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 510
400
Tensile Strength: Ultimate (UTS), MPa 830
650
Tensile Strength: Yield (Proof), MPa 720
490

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Maximum Temperature: Mechanical, °C 420
410
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
39
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.1
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 9.3
8.5

Otherwise Unclassified Properties

Base Metal Price, % relative 3.7
2.9
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.9
1.6
Embodied Energy, MJ/kg 26
22
Embodied Water, L/kg 54
51

Common Calculations

PREN (Pitting Resistance) 2.0
2.1
Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
120
Resilience: Unit (Modulus of Resilience), kJ/m3 1370
650
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 29
23
Strength to Weight: Bending, points 25
21
Thermal Diffusivity, mm2/s 11
10
Thermal Shock Resistance, points 24
19

Alloy Composition

Boron (B), % 0 to 0.0050
0
Carbon (C), % 0 to 0.2
0.15 to 0.23
Chromium (Cr), % 0 to 1.5
0 to 0.5
Copper (Cu), % 0 to 0.3
0 to 0.2
Iron (Fe), % 91.9 to 100
95.9 to 98
Manganese (Mn), % 0 to 1.7
1.0 to 1.5
Molybdenum (Mo), % 0 to 0.7
0.45 to 0.6
Nickel (Ni), % 0 to 2.5
0.4 to 0.8
Niobium (Nb), % 0 to 0.060
0
Nitrogen (N), % 0 to 0.015
0 to 0.012
Phosphorus (P), % 0 to 0.020
0 to 0.035
Silicon (Si), % 0 to 0.8
0 to 0.4
Sulfur (S), % 0 to 0.0050
0 to 0.035
Titanium (Ti), % 0 to 0.050
0
Vanadium (V), % 0 to 0.12
0 to 0.020
Zirconium (Zr), % 0 to 0.15
0