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AISI 439 Stainless Steel vs. AISI 431 Stainless Steel

Both AISI 439 stainless steel and AISI 431 stainless steel are iron alloys. They have a very high 97% of their average alloy composition in common. There are 33 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is AISI 439 stainless steel and the bottom bar is AISI 431 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
250
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 23
15 to 17
Fatigue Strength, MPa 170
430 to 610
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
77
Shear Strength, MPa 310
550 to 840
Tensile Strength: Ultimate (UTS), MPa 490
890 to 1380
Tensile Strength: Yield (Proof), MPa 250
710 to 1040

Thermal Properties

Latent Heat of Fusion, J/g 280
280
Maximum Temperature: Corrosion, °C 530
400
Maximum Temperature: Mechanical, °C 890
850
Melting Completion (Liquidus), °C 1510
1510
Melting Onset (Solidus), °C 1430
1450
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 25
26
Thermal Expansion, µm/m-K 11
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
2.6
Electrical Conductivity: Equal Weight (Specific), % IACS 3.4
3.0

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
9.0
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 2.3
2.2
Embodied Energy, MJ/kg 34
31
Embodied Water, L/kg 120
120

Common Calculations

PREN (Pitting Resistance) 18
16
Resilience: Ultimate (Unit Rupture Work), MJ/m3 95
140 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 160
1270 to 2770
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 18
32 to 50
Strength to Weight: Bending, points 18
27 to 36
Thermal Diffusivity, mm2/s 6.7
7.0
Thermal Shock Resistance, points 16
28 to 43

Alloy Composition

Aluminum (Al), % 0 to 0.15
0
Carbon (C), % 0 to 0.030
0 to 0.2
Chromium (Cr), % 17 to 19
15 to 17
Iron (Fe), % 77.1 to 82.8
78.2 to 83.8
Manganese (Mn), % 0 to 1.0
0 to 1.0
Nickel (Ni), % 0 to 0.5
1.3 to 2.5
Nitrogen (N), % 0 to 0.030
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Titanium (Ti), % 0.2 to 1.1
0