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EN 1.3940 Stainless Steel vs. EN 1.4490 Stainless Steel

Both EN 1.3940 stainless steel and EN 1.4490 stainless steel are iron alloys. Both are furnished in the solution annealed (AT) condition. They have a very high 96% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.3940 stainless steel and the bottom bar is EN 1.4490 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 34
34
Fatigue Strength, MPa 190
210
Impact Strength: V-Notched Charpy, J 130
90
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
78
Tensile Strength: Ultimate (UTS), MPa 540
560
Tensile Strength: Yield (Proof), MPa 240
260

Thermal Properties

Latent Heat of Fusion, J/g 290
300
Maximum Temperature: Corrosion, °C 410
420
Maximum Temperature: Mechanical, °C 930
990
Melting Completion (Liquidus), °C 1420
1440
Melting Onset (Solidus), °C 1380
1390
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 15
15
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.3
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 17
19
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.3
3.7
Embodied Energy, MJ/kg 47
52
Embodied Water, L/kg 150
150

Common Calculations

PREN (Pitting Resistance) 20
29
Resilience: Ultimate (Unit Rupture Work), MJ/m3 150
160
Resilience: Unit (Modulus of Resilience), kJ/m3 150
170
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
20
Strength to Weight: Bending, points 19
19
Thermal Diffusivity, mm2/s 4.1
4.1
Thermal Shock Resistance, points 16
16

Alloy Composition

Carbon (C), % 0 to 0.030
0 to 0.030
Chromium (Cr), % 16.5 to 18.5
18 to 20
Iron (Fe), % 64.2 to 71.4
61.7 to 70.9
Manganese (Mn), % 0 to 2.0
0 to 2.0
Molybdenum (Mo), % 0
2.0 to 2.5
Nickel (Ni), % 12 to 14
9.0 to 12
Nitrogen (N), % 0.1 to 0.2
0.12 to 0.2
Phosphorus (P), % 0 to 0.035
0 to 0.035
Silicon (Si), % 0 to 1.0
0 to 1.5
Sulfur (S), % 0 to 0.020
0 to 0.030