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EN 1.3940 Stainless Steel vs. EN 1.8945 Steel

Both EN 1.3940 stainless steel and EN 1.8945 steel are iron alloys. They have 70% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is EN 1.3940 stainless steel and the bottom bar is EN 1.8945 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 34
16
Fatigue Strength, MPa 190
260
Impact Strength: V-Notched Charpy, J 130
30
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
73
Tensile Strength: Ultimate (UTS), MPa 540
580
Tensile Strength: Yield (Proof), MPa 240
390

Thermal Properties

Latent Heat of Fusion, J/g 290
250
Maximum Temperature: Mechanical, °C 930
420
Melting Completion (Liquidus), °C 1420
1460
Melting Onset (Solidus), °C 1380
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
42
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.3
7.5
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 17
2.5
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.3
1.5
Embodied Energy, MJ/kg 47
19
Embodied Water, L/kg 150
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 150
82
Resilience: Unit (Modulus of Resilience), kJ/m3 150
410
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 19
20
Strength to Weight: Bending, points 19
20
Thermal Diffusivity, mm2/s 4.1
11
Thermal Shock Resistance, points 16
17

Alloy Composition

Carbon (C), % 0 to 0.030
0 to 0.15
Chromium (Cr), % 16.5 to 18.5
0.25 to 1.4
Copper (Cu), % 0
0.2 to 0.6
Iron (Fe), % 64.2 to 71.4
95.1 to 99.5
Manganese (Mn), % 0 to 2.0
0 to 1.1
Nickel (Ni), % 12 to 14
0 to 0.7
Nitrogen (N), % 0.1 to 0.2
0 to 0.010
Phosphorus (P), % 0 to 0.035
0.050 to 0.16
Silicon (Si), % 0 to 1.0
0 to 0.8
Sulfur (S), % 0 to 0.020
0 to 0.040