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EN 1.4409 Stainless Steel vs. EN 1.4309 Stainless Steel

Both EN 1.4409 stainless steel and EN 1.4309 stainless steel are iron alloys. Both are furnished in the solution annealed (AT) condition. They have a very high 98% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.4409 stainless steel and the bottom bar is EN 1.4309 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
140
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 34
34
Fatigue Strength, MPa 180
170
Impact Strength: V-Notched Charpy, J 90
90
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
77
Tensile Strength: Ultimate (UTS), MPa 490
490
Tensile Strength: Yield (Proof), MPa 220
210

Thermal Properties

Latent Heat of Fusion, J/g 300
290
Maximum Temperature: Corrosion, °C 420
420
Maximum Temperature: Mechanical, °C 990
960
Melting Completion (Liquidus), °C 1440
1420
Melting Onset (Solidus), °C 1390
1380
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 15
15
Thermal Expansion, µm/m-K 16
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.1
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
2.6

Otherwise Unclassified Properties

Base Metal Price, % relative 19
16
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.7
3.1
Embodied Energy, MJ/kg 52
45
Embodied Water, L/kg 160
150

Common Calculations

PREN (Pitting Resistance) 28
21
Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
140
Resilience: Unit (Modulus of Resilience), kJ/m3 120
110
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 17
18
Strength to Weight: Bending, points 18
18
Thermal Diffusivity, mm2/s 4.1
4.1
Thermal Shock Resistance, points 11
11

Alloy Composition

Carbon (C), % 0 to 0.030
0 to 0.030
Chromium (Cr), % 18 to 20
18 to 20
Iron (Fe), % 61.7 to 71
64.2 to 73
Manganese (Mn), % 0 to 2.0
0 to 2.0
Molybdenum (Mo), % 2.0 to 2.5
0
Nickel (Ni), % 9.0 to 12
9.0 to 12
Nitrogen (N), % 0 to 0.2
0 to 0.2
Phosphorus (P), % 0 to 0.035
0 to 0.035
Silicon (Si), % 0 to 1.5
0 to 1.5
Sulfur (S), % 0 to 0.025
0 to 0.025