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AISI 309 Stainless Steel vs. AISI 434 Stainless Steel

Both AISI 309 stainless steel and AISI 434 stainless steel are iron alloys. They have 80% of their average alloy composition in common. There are 34 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is AISI 309 stainless steel and the bottom bar is AISI 434 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180 to 210
170
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 34 to 47
24
Fatigue Strength, MPa 250 to 280
220
Poisson's Ratio 0.27
0.28
Rockwell B Hardness 84
77
Shear Modulus, GPa 78
78
Shear Strength, MPa 420 to 470
330
Tensile Strength: Ultimate (UTS), MPa 600 to 710
520
Tensile Strength: Yield (Proof), MPa 260 to 350
320

Thermal Properties

Latent Heat of Fusion, J/g 290
280
Maximum Temperature: Corrosion, °C 440
410
Maximum Temperature: Mechanical, °C 980
880
Melting Completion (Liquidus), °C 1450
1510
Melting Onset (Solidus), °C 1400
1430
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 16
25
Thermal Expansion, µm/m-K 15
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 19
9.5
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 3.6
2.4
Embodied Energy, MJ/kg 51
33
Embodied Water, L/kg 170
120

Common Calculations

PREN (Pitting Resistance) 23
20
Resilience: Ultimate (Unit Rupture Work), MJ/m3 200 to 230
110
Resilience: Unit (Modulus of Resilience), kJ/m3 170 to 310
260
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 21 to 25
19
Strength to Weight: Bending, points 20 to 23
18
Thermal Diffusivity, mm2/s 4.3
6.7
Thermal Shock Resistance, points 14 to 16
19

Alloy Composition

Carbon (C), % 0 to 0.2
0 to 0.12
Chromium (Cr), % 22 to 24
16 to 18
Iron (Fe), % 58 to 66
78.6 to 83.3
Manganese (Mn), % 0 to 2.0
0 to 1.0
Molybdenum (Mo), % 0
0.75 to 1.3
Nickel (Ni), % 12 to 15
0
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 0.75
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030