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EN 1.4404 Stainless Steel vs. AISI 309 Stainless Steel

Both EN 1.4404 stainless steel and AISI 309 stainless steel are iron alloys. They have a moderately high 92% of their average alloy composition in common. There are 33 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 1.4404 stainless steel and the bottom bar is AISI 309 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190 to 270
180 to 210
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 14 to 43
34 to 47
Fatigue Strength, MPa 220 to 320
250 to 280
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 78
78
Shear Strength, MPa 420 to 550
420 to 470
Tensile Strength: Ultimate (UTS), MPa 600 to 900
600 to 710
Tensile Strength: Yield (Proof), MPa 240 to 570
260 to 350

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Corrosion, °C 410
440
Maximum Temperature: Mechanical, °C 950
980
Melting Completion (Liquidus), °C 1440
1450
Melting Onset (Solidus), °C 1400
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 15
16
Thermal Expansion, µm/m-K 16
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.3
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.6
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 19
19
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 3.8
3.6
Embodied Energy, MJ/kg 52
51
Embodied Water, L/kg 150
170

Common Calculations

PREN (Pitting Resistance) 26
23
Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 210
200 to 230
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 800
170 to 310
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 21 to 32
21 to 25
Strength to Weight: Bending, points 20 to 26
20 to 23
Thermal Diffusivity, mm2/s 4.0
4.3
Thermal Shock Resistance, points 13 to 20
14 to 16

Alloy Composition

Carbon (C), % 0 to 0.030
0 to 0.2
Chromium (Cr), % 16.5 to 18.5
22 to 24
Iron (Fe), % 62.8 to 71.5
58 to 66
Manganese (Mn), % 0 to 2.0
0 to 2.0
Molybdenum (Mo), % 2.0 to 2.5
0
Nickel (Ni), % 10 to 13
12 to 15
Nitrogen (N), % 0 to 0.1
0
Phosphorus (P), % 0 to 0.045
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 0.75
Sulfur (S), % 0 to 0.015
0 to 0.030