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EN 1.7720 Steel vs. EN 1.4317 Stainless Steel

Both EN 1.7720 steel and EN 1.4317 stainless steel are iron alloys. Both are furnished in the quenched and tempered condition. They have 83% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is EN 1.7720 steel and the bottom bar is EN 1.4317 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 19
17
Fatigue Strength, MPa 230
380
Impact Strength: V-Notched Charpy, J 30
56
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
76
Tensile Strength: Ultimate (UTS), MPa 590
860
Tensile Strength: Yield (Proof), MPa 340
630

Thermal Properties

Latent Heat of Fusion, J/g 250
280
Maximum Temperature: Mechanical, °C 410
770
Melting Completion (Liquidus), °C 1470
1440
Melting Onset (Solidus), °C 1430
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 40
26
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
2.7
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
3.2

Otherwise Unclassified Properties

Base Metal Price, % relative 2.8
10
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 2.2
2.4
Embodied Energy, MJ/kg 30
33
Embodied Water, L/kg 51
110

Common Calculations

PREN (Pitting Resistance) 2.1
14
Resilience: Ultimate (Unit Rupture Work), MJ/m3 97
130
Resilience: Unit (Modulus of Resilience), kJ/m3 300
1010
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 21
31
Strength to Weight: Bending, points 20
26
Thermal Diffusivity, mm2/s 11
7.0
Thermal Shock Resistance, points 17
30

Alloy Composition

Carbon (C), % 0.1 to 0.15
0 to 0.060
Chromium (Cr), % 0.3 to 0.5
12 to 13.5
Copper (Cu), % 0 to 0.3
0
Iron (Fe), % 96.6 to 98.6
78.7 to 84.5
Manganese (Mn), % 0.4 to 0.7
0 to 1.0
Molybdenum (Mo), % 0.4 to 0.6
0 to 0.7
Nickel (Ni), % 0 to 0.4
3.5 to 5.0
Phosphorus (P), % 0 to 0.030
0 to 0.035
Silicon (Si), % 0 to 0.45
0 to 1.0
Sulfur (S), % 0 to 0.020
0 to 0.025
Vanadium (V), % 0.22 to 0.3
0