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EN 1.4931 Steel vs. EN 1.7379 Steel

Both EN 1.4931 steel and EN 1.7379 steel are iron alloys. Both are furnished in the quenched and tempered condition. They have 89% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.4931 steel and the bottom bar is EN 1.7379 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 240
200
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 17
21
Fatigue Strength, MPa 410
320
Impact Strength: V-Notched Charpy, J 30
45
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
74
Tensile Strength: Ultimate (UTS), MPa 810
670
Tensile Strength: Yield (Proof), MPa 620
460

Thermal Properties

Latent Heat of Fusion, J/g 270
260
Maximum Temperature: Mechanical, °C 600
460
Melting Completion (Liquidus), °C 1460
1470
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 24
39
Thermal Expansion, µm/m-K 14
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 9.8
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 11
8.8

Otherwise Unclassified Properties

Base Metal Price, % relative 8.5
3.8
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.9
1.8
Embodied Energy, MJ/kg 42
23
Embodied Water, L/kg 100
59

Common Calculations

PREN (Pitting Resistance) 16
5.7
Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
120
Resilience: Unit (Modulus of Resilience), kJ/m3 970
550
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 29
24
Strength to Weight: Bending, points 25
22
Thermal Diffusivity, mm2/s 6.5
11
Thermal Shock Resistance, points 22
19

Alloy Composition

Carbon (C), % 0.2 to 0.26
0.13 to 0.2
Chromium (Cr), % 11.3 to 12.2
2.0 to 2.5
Iron (Fe), % 83.2 to 86.8
94.5 to 96.5
Manganese (Mn), % 0.5 to 0.8
0.5 to 0.9
Molybdenum (Mo), % 1.0 to 1.2
0.9 to 1.2
Nickel (Ni), % 0 to 1.0
0
Phosphorus (P), % 0 to 0.030
0 to 0.025
Silicon (Si), % 0 to 0.4
0 to 0.6
Sulfur (S), % 0 to 0.020
0 to 0.030
Tungsten (W), % 0 to 0.5
0
Vanadium (V), % 0.25 to 0.35
0