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EN 1.7380 Steel vs. EN 1.7720 Steel

Both EN 1.7380 steel and EN 1.7720 steel are iron alloys. They have a very high 98% of their average alloy composition in common. There are 32 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 1.7380 steel and the bottom bar is EN 1.7720 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 170
180
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 19 to 20
19
Fatigue Strength, MPa 200 to 230
230
Impact Strength: V-Notched Charpy, J 31 to 35
30
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
73
Tensile Strength: Ultimate (UTS), MPa 540 to 550
590
Tensile Strength: Yield (Proof), MPa 290 to 330
340

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Maximum Temperature: Mechanical, °C 460
410
Melting Completion (Liquidus), °C 1470
1470
Melting Onset (Solidus), °C 1430
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 7.6
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.7
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 3.8
2.8
Density, g/cm3 7.9
7.9
Embodied Carbon, kg CO2/kg material 1.8
2.2
Embodied Energy, MJ/kg 23
30
Embodied Water, L/kg 59
51

Common Calculations

PREN (Pitting Resistance) 5.6
2.1
Resilience: Ultimate (Unit Rupture Work), MJ/m3 87 to 98
97
Resilience: Unit (Modulus of Resilience), kJ/m3 230 to 280
300
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 19 to 20
21
Strength to Weight: Bending, points 19
20
Thermal Diffusivity, mm2/s 11
11
Thermal Shock Resistance, points 15 to 16
17

Alloy Composition

Carbon (C), % 0.080 to 0.14
0.1 to 0.15
Chromium (Cr), % 2.0 to 2.5
0.3 to 0.5
Copper (Cu), % 0 to 0.3
0 to 0.3
Iron (Fe), % 94.6 to 96.6
96.6 to 98.6
Manganese (Mn), % 0.4 to 0.8
0.4 to 0.7
Molybdenum (Mo), % 0.9 to 1.1
0.4 to 0.6
Nickel (Ni), % 0
0 to 0.4
Nitrogen (N), % 0 to 0.012
0
Phosphorus (P), % 0 to 0.020
0 to 0.030
Silicon (Si), % 0 to 0.5
0 to 0.45
Sulfur (S), % 0 to 0.010
0 to 0.020
Vanadium (V), % 0
0.22 to 0.3