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EN 1.7725 Steel vs. EN 1.3940 Stainless Steel

Both EN 1.7725 steel and EN 1.3940 stainless steel are iron alloys. They have 70% 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 1.7725 steel and the bottom bar is EN 1.3940 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 14
34
Fatigue Strength, MPa 390 to 550
190
Impact Strength: V-Notched Charpy, J 34 to 35
130
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
77
Tensile Strength: Ultimate (UTS), MPa 830 to 1000
540
Tensile Strength: Yield (Proof), MPa 610 to 860
240

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Maximum Temperature: Mechanical, °C 440
930
Melting Completion (Liquidus), °C 1460
1420
Melting Onset (Solidus), °C 1420
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 39
15
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 2.9
17
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.8
3.3
Embodied Energy, MJ/kg 24
47
Embodied Water, L/kg 54
150

Common Calculations

PREN (Pitting Resistance) 2.8
20
Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 130
150
Resilience: Unit (Modulus of Resilience), kJ/m3 980 to 1940
150
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 29 to 35
19
Strength to Weight: Bending, points 25 to 28
19
Thermal Diffusivity, mm2/s 11
4.1
Thermal Shock Resistance, points 24 to 29
16

Alloy Composition

Carbon (C), % 0.27 to 0.34
0 to 0.030
Chromium (Cr), % 1.3 to 1.7
16.5 to 18.5
Iron (Fe), % 95.7 to 97.5
64.2 to 71.4
Manganese (Mn), % 0.6 to 1.0
0 to 2.0
Molybdenum (Mo), % 0.3 to 0.5
0
Nickel (Ni), % 0
12 to 14
Nitrogen (N), % 0
0.1 to 0.2
Phosphorus (P), % 0 to 0.025
0 to 0.035
Silicon (Si), % 0 to 0.6
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.020
Vanadium (V), % 0.050 to 0.15
0