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EN 1.4421 Stainless Steel vs. AISI 309 Stainless Steel

Both EN 1.4421 stainless steel and AISI 309 stainless steel are iron alloys. They have 84% of their average alloy composition in common. There are 31 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 1.4421 stainless steel and the bottom bar is AISI 309 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 11 to 17
34 to 47
Fatigue Strength, MPa 380 to 520
250 to 280
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 77
78
Tensile Strength: Ultimate (UTS), MPa 880 to 1100
600 to 710
Tensile Strength: Yield (Proof), MPa 620 to 950
260 to 350

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Maximum Temperature: Corrosion, °C 410
440
Maximum Temperature: Mechanical, °C 870
980
Melting Completion (Liquidus), °C 1440
1450
Melting Onset (Solidus), °C 1400
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 16
16
Thermal Expansion, µm/m-K 10
15

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 12
19
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.6
3.6
Embodied Energy, MJ/kg 36
51
Embodied Water, L/kg 130
170

Common Calculations

PREN (Pitting Resistance) 18
23
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120 to 140
200 to 230
Resilience: Unit (Modulus of Resilience), kJ/m3 960 to 2270
170 to 310
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 31 to 39
21 to 25
Strength to Weight: Bending, points 26 to 30
20 to 23
Thermal Diffusivity, mm2/s 4.4
4.3
Thermal Shock Resistance, points 31 to 39
14 to 16

Alloy Composition

Carbon (C), % 0 to 0.060
0 to 0.2
Chromium (Cr), % 15.5 to 17.5
22 to 24
Iron (Fe), % 74.4 to 80.5
58 to 66
Manganese (Mn), % 0 to 1.0
0 to 2.0
Molybdenum (Mo), % 0 to 0.7
0
Nickel (Ni), % 4.0 to 5.5
12 to 15
Phosphorus (P), % 0 to 0.035
0 to 0.045
Silicon (Si), % 0 to 0.8
0 to 0.75
Sulfur (S), % 0 to 0.020
0 to 0.030

Comparable Variants