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EN 1.7725 Steel vs. EN 1.7720 Steel

Both EN 1.7725 steel and EN 1.7720 steel are iron alloys. They have a very high 98% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.7725 steel and the bottom bar is EN 1.7720 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 250 to 300
180
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 14
19
Fatigue Strength, MPa 390 to 550
230
Impact Strength: V-Notched Charpy, J 34 to 35
30
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 830 to 1000
590
Tensile Strength: Yield (Proof), MPa 610 to 860
340

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 440
410
Melting Completion (Liquidus), °C 1460
1470
Melting Onset (Solidus), °C 1420
1430
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 39
40
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 2.9
2.8
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.8
2.2
Embodied Energy, MJ/kg 24
30
Embodied Water, L/kg 54
51

Common Calculations

PREN (Pitting Resistance) 2.8
2.1
Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 130
97
Resilience: Unit (Modulus of Resilience), kJ/m3 980 to 1940
300
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 29 to 35
21
Strength to Weight: Bending, points 25 to 28
20
Thermal Diffusivity, mm2/s 11
11
Thermal Shock Resistance, points 24 to 29
17

Alloy Composition

Carbon (C), % 0.27 to 0.34
0.1 to 0.15
Chromium (Cr), % 1.3 to 1.7
0.3 to 0.5
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 95.7 to 97.5
96.6 to 98.6
Manganese (Mn), % 0.6 to 1.0
0.4 to 0.7
Molybdenum (Mo), % 0.3 to 0.5
0.4 to 0.6
Nickel (Ni), % 0
0 to 0.4
Phosphorus (P), % 0 to 0.025
0 to 0.030
Silicon (Si), % 0 to 0.6
0 to 0.45
Sulfur (S), % 0 to 0.030
0 to 0.020
Vanadium (V), % 0.050 to 0.15
0.22 to 0.3