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AISI 431 Stainless Steel vs. AISI 347 Stainless Steel

Both AISI 431 stainless steel and AISI 347 stainless steel are iron alloys. They have 88% of their average alloy composition in common. There are 33 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 AISI 431 stainless steel and the bottom bar is AISI 347 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 250
160 to 210
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 15 to 17
34 to 46
Fatigue Strength, MPa 430 to 610
220 to 270
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
77
Shear Strength, MPa 550 to 840
430 to 460
Tensile Strength: Ultimate (UTS), MPa 890 to 1380
610 to 690
Tensile Strength: Yield (Proof), MPa 710 to 1040
240 to 350

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Maximum Temperature: Corrosion, °C 400
480
Maximum Temperature: Mechanical, °C 850
870
Melting Completion (Liquidus), °C 1510
1430
Melting Onset (Solidus), °C 1450
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 26
16
Thermal Expansion, µm/m-K 12
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.6
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 3.0
2.7

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
52
Embodied Water, L/kg 120
150

Common Calculations

PREN (Pitting Resistance) 16
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 180
190 to 220
Resilience: Unit (Modulus of Resilience), kJ/m3 1270 to 2770
150 to 310
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 32 to 50
22 to 25
Strength to Weight: Bending, points 27 to 36
20 to 22
Thermal Diffusivity, mm2/s 7.0
4.3
Thermal Shock Resistance, points 28 to 43
13 to 15

Alloy Composition

Carbon (C), % 0 to 0.2
0 to 0.080
Chromium (Cr), % 15 to 17
17 to 19
Iron (Fe), % 78.2 to 83.8
64.1 to 74
Manganese (Mn), % 0 to 1.0
0 to 2.0
Nickel (Ni), % 1.3 to 2.5
9.0 to 13
Niobium (Nb), % 0
0 to 1.0
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