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EN 1.7720 Steel vs. EN 1.4409 Stainless Steel

Both EN 1.7720 steel and EN 1.4409 stainless steel are iron alloys. They have 68% 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 1.7720 steel and the bottom bar is EN 1.4409 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
140
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 19
34
Fatigue Strength, MPa 230
180
Impact Strength: V-Notched Charpy, J 30
90
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
78
Tensile Strength: Ultimate (UTS), MPa 590
490
Tensile Strength: Yield (Proof), MPa 340
220

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Maximum Temperature: Mechanical, °C 410
990
Melting Completion (Liquidus), °C 1470
1440
Melting Onset (Solidus), °C 1430
1390
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 40
15
Thermal Expansion, µm/m-K 13
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 2.8
19
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 2.2
3.7
Embodied Energy, MJ/kg 30
52
Embodied Water, L/kg 51
160

Common Calculations

PREN (Pitting Resistance) 2.1
28
Resilience: Ultimate (Unit Rupture Work), MJ/m3 97
140
Resilience: Unit (Modulus of Resilience), kJ/m3 300
120
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 21
17
Strength to Weight: Bending, points 20
18
Thermal Diffusivity, mm2/s 11
4.1
Thermal Shock Resistance, points 17
11

Alloy Composition

Carbon (C), % 0.1 to 0.15
0 to 0.030
Chromium (Cr), % 0.3 to 0.5
18 to 20
Copper (Cu), % 0 to 0.3
0
Iron (Fe), % 96.6 to 98.6
61.7 to 71
Manganese (Mn), % 0.4 to 0.7
0 to 2.0
Molybdenum (Mo), % 0.4 to 0.6
2.0 to 2.5
Nickel (Ni), % 0 to 0.4
9.0 to 12
Nitrogen (N), % 0
0 to 0.2
Phosphorus (P), % 0 to 0.030
0 to 0.035
Silicon (Si), % 0 to 0.45
0 to 1.5
Sulfur (S), % 0 to 0.020
0 to 0.025
Vanadium (V), % 0.22 to 0.3
0