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EN 1.3960 Stainless Steel vs. EN 1.3940 Stainless Steel

Both EN 1.3960 stainless steel and EN 1.3940 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 1.3960 stainless steel and the bottom bar is EN 1.3940 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 34
34
Fatigue Strength, MPa 220
190
Impact Strength: V-Notched Charpy, J 90
130
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
77
Tensile Strength: Ultimate (UTS), MPa 590
540
Tensile Strength: Yield (Proof), MPa 270
240

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Corrosion, °C 410
410
Maximum Temperature: Mechanical, °C 970
930
Melting Completion (Liquidus), °C 1440
1420
Melting Onset (Solidus), °C 1400
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 15
15
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.6
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 21
17
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 4.1
3.3
Embodied Energy, MJ/kg 57
47
Embodied Water, L/kg 160
150

Common Calculations

PREN (Pitting Resistance) 30
20
Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
150
Resilience: Unit (Modulus of Resilience), kJ/m3 190
150
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 21
19
Strength to Weight: Bending, points 20
19
Thermal Diffusivity, mm2/s 3.9
4.1
Thermal Shock Resistance, points 17
16

Alloy Composition

Carbon (C), % 0 to 0.030
0 to 0.030
Chromium (Cr), % 16.5 to 18.5
16.5 to 18.5
Iron (Fe), % 60.2 to 67.9
64.2 to 71.4
Manganese (Mn), % 0 to 2.0
0 to 2.0
Molybdenum (Mo), % 2.5 to 3.0
0
Nickel (Ni), % 13 to 15
12 to 14
Nitrogen (N), % 0.15 to 0.25
0.1 to 0.2
Phosphorus (P), % 0 to 0.035
0 to 0.035
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.020
0 to 0.020