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EN 1.4031 Stainless Steel vs. AISI 309 Stainless Steel

Both EN 1.4031 stainless steel and AISI 309 stainless steel are iron alloys. They have 77% of their average alloy composition in common. There are 32 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 1.4031 stainless steel and the bottom bar is AISI 309 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 11 to 13
34 to 47
Fatigue Strength, MPa 220 to 400
250 to 280
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 76
78
Shear Strength, MPa 400 to 540
420 to 470
Tensile Strength: Ultimate (UTS), MPa 670 to 900
600 to 710
Tensile Strength: Yield (Proof), MPa 390 to 730
260 to 350

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Maximum Temperature: Corrosion, °C 390
440
Maximum Temperature: Mechanical, °C 770
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 30
16
Thermal Expansion, µm/m-K 11
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.1
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 3.7
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
19
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 1.9
3.6
Embodied Energy, MJ/kg 27
51
Embodied Water, L/kg 100
170

Common Calculations

PREN (Pitting Resistance) 14
23
Resilience: Ultimate (Unit Rupture Work), MJ/m3 77 to 94
200 to 230
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 1360
170 to 310
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 24 to 32
21 to 25
Strength to Weight: Bending, points 22 to 27
20 to 23
Thermal Diffusivity, mm2/s 8.1
4.3
Thermal Shock Resistance, points 23 to 32
14 to 16

Alloy Composition

Carbon (C), % 0.36 to 0.42
0 to 0.2
Chromium (Cr), % 12.5 to 14.5
22 to 24
Iron (Fe), % 83 to 87.1
58 to 66
Manganese (Mn), % 0 to 1.0
0 to 2.0
Nickel (Ni), % 0
12 to 15
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 0.75
Sulfur (S), % 0 to 0.015
0 to 0.030