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EN 1.8550 Steel vs. EN 1.6958 Steel

Both EN 1.8550 steel and EN 1.6958 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. 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 1.8550 steel and the bottom bar is EN 1.6958 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 300
340
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11
16
Fatigue Strength, MPa 470
700
Impact Strength: V-Notched Charpy, J 34
63
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 600
700
Tensile Strength: Ultimate (UTS), MPa 1000
1140
Tensile Strength: Yield (Proof), MPa 760
1070

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 440
450
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 40
47
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
7.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 3.4
5.0
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.7
2.0
Embodied Energy, MJ/kg 23
27
Embodied Water, L/kg 67
60

Common Calculations

PREN (Pitting Resistance) 2.3
2.9
Resilience: Ultimate (Unit Rupture Work), MJ/m3 100
180
Resilience: Unit (Modulus of Resilience), kJ/m3 1550
3050
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 36
40
Strength to Weight: Bending, points 29
31
Thermal Diffusivity, mm2/s 11
13
Thermal Shock Resistance, points 29
39

Alloy Composition

Aluminum (Al), % 0.8 to 1.2
0.0050 to 0.050
Carbon (C), % 0.3 to 0.37
0.25 to 0.3
Chromium (Cr), % 1.5 to 1.8
1.2 to 1.7
Iron (Fe), % 94.4 to 96.3
92.6 to 94.5
Manganese (Mn), % 0.4 to 0.7
0.2 to 0.5
Molybdenum (Mo), % 0.15 to 0.25
0.35 to 0.55
Nickel (Ni), % 0.85 to 1.2
3.3 to 3.8
Phosphorus (P), % 0 to 0.025
0 to 0.020
Silicon (Si), % 0 to 0.4
0.15 to 0.3
Sulfur (S), % 0 to 0.035
0 to 0.015
Vanadium (V), % 0
0 to 0.12