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EN 1.6958 Steel vs. EN 1.6957 Steel

Both EN 1.6958 steel and EN 1.6957 steel are iron alloys. Both are furnished in the quenched and tempered condition. Their average alloy composition is basically identical.

For each property being compared, the top bar is EN 1.6958 steel and the bottom bar is EN 1.6957 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 340
280
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 16
18
Fatigue Strength, MPa 700
530
Impact Strength: V-Notched Charpy, J 63
71
Poisson's Ratio 0.29
0.29
Reduction in Area, % 56
46
Shear Modulus, GPa 73
73
Shear Strength, MPa 700
570
Tensile Strength: Ultimate (UTS), MPa 1140
930
Tensile Strength: Yield (Proof), MPa 1070
780

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 450
450
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 47
47
Thermal Expansion, µm/m-K 11
13

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 5.0
5.0
Density, g/cm3 7.9
7.9
Embodied Carbon, kg CO2/kg material 2.0
2.1
Embodied Energy, MJ/kg 27
29
Embodied Water, L/kg 60
60

Common Calculations

PREN (Pitting Resistance) 2.9
2.7
Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
160
Resilience: Unit (Modulus of Resilience), kJ/m3 3050
1630
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 40
33
Strength to Weight: Bending, points 31
27
Thermal Diffusivity, mm2/s 13
13
Thermal Shock Resistance, points 39
27

Alloy Composition

Aluminum (Al), % 0.0050 to 0.050
0
Carbon (C), % 0.25 to 0.3
0.22 to 0.32
Chromium (Cr), % 1.2 to 1.7
1.2 to 1.8
Iron (Fe), % 92.6 to 94.5
92.7 to 94.7
Manganese (Mn), % 0.2 to 0.5
0.15 to 0.4
Molybdenum (Mo), % 0.35 to 0.55
0.25 to 0.45
Nickel (Ni), % 3.3 to 3.8
3.4 to 4.0
Phosphorus (P), % 0 to 0.020
0 to 0.010
Silicon (Si), % 0.15 to 0.3
0 to 0.15
Sulfur (S), % 0 to 0.015
0 to 0.0070
Vanadium (V), % 0 to 0.12
0.050 to 0.15