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AISI 431 Stainless Steel vs. AISI 309H Stainless Steel

Both AISI 431 stainless steel and AISI 309H stainless steel are iron alloys. They have 81% of their average alloy composition in common. There are 33 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is AISI 431 stainless steel and the bottom bar is AISI 309H stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 250
190
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 15 to 17
40
Fatigue Strength, MPa 430 to 610
200
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 77
78
Shear Strength, MPa 550 to 840
400
Tensile Strength: Ultimate (UTS), MPa 890 to 1380
580
Tensile Strength: Yield (Proof), MPa 710 to 1040
230

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Maximum Temperature: Corrosion, °C 400
440
Maximum Temperature: Mechanical, °C 850
1080
Melting Completion (Liquidus), °C 1510
1420
Melting Onset (Solidus), °C 1450
1370
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 26
15
Thermal Expansion, µm/m-K 12
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.6
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 3.0
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
19
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 2.2
3.6
Embodied Energy, MJ/kg 31
51
Embodied Water, L/kg 120
170

Common Calculations

PREN (Pitting Resistance) 16
23
Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 180
190
Resilience: Unit (Modulus of Resilience), kJ/m3 1270 to 2770
130
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 32 to 50
21
Strength to Weight: Bending, points 27 to 36
20
Thermal Diffusivity, mm2/s 7.0
4.0
Thermal Shock Resistance, points 28 to 43
13

Alloy Composition

Carbon (C), % 0 to 0.2
0.040 to 0.1
Chromium (Cr), % 15 to 17
22 to 24
Iron (Fe), % 78.2 to 83.8
58.1 to 66
Manganese (Mn), % 0 to 1.0
0 to 2.0
Nickel (Ni), % 1.3 to 2.5
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 0.030
0 to 0.030