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EN 1.6958 Steel vs. EN 1.8509 Steel

Both EN 1.6958 steel and EN 1.8509 steel are iron alloys. Both are furnished in the quenched and tempered condition. They have a very high 96% 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 1.6958 steel and the bottom bar is EN 1.8509 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 340
340
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 16
11
Fatigue Strength, MPa 700
580
Impact Strength: V-Notched Charpy, J 63
29
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 700
680
Tensile Strength: Ultimate (UTS), MPa 1140
1130
Tensile Strength: Yield (Proof), MPa 1070
940

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 450
440
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 47
39
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.9
7.5
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 5.0
2.8
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 2.0
1.6
Embodied Energy, MJ/kg 27
22
Embodied Water, L/kg 60
65

Common Calculations

PREN (Pitting Resistance) 2.9
2.6
Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
120
Resilience: Unit (Modulus of Resilience), kJ/m3 3050
2340
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 40
40
Strength to Weight: Bending, points 31
31
Thermal Diffusivity, mm2/s 13
10
Thermal Shock Resistance, points 39
33

Alloy Composition

Aluminum (Al), % 0.0050 to 0.050
0.8 to 1.2
Carbon (C), % 0.25 to 0.3
0.38 to 0.45
Chromium (Cr), % 1.2 to 1.7
1.5 to 1.8
Iron (Fe), % 92.6 to 94.5
95.5 to 97.1
Manganese (Mn), % 0.2 to 0.5
0.4 to 0.7
Molybdenum (Mo), % 0.35 to 0.55
0.2 to 0.35
Nickel (Ni), % 3.3 to 3.8
0
Phosphorus (P), % 0 to 0.020
0 to 0.025
Silicon (Si), % 0.15 to 0.3
0 to 0.4
Sulfur (S), % 0 to 0.015
0 to 0.035
Vanadium (V), % 0 to 0.12
0