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AISI 439 Stainless Steel vs. AISI 420 Stainless Steel

Both AISI 439 stainless steel and AISI 420 stainless steel are iron alloys. They have a moderately high 94% of their average alloy composition in common. There are 34 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 439 stainless steel and the bottom bar is AISI 420 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
190
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 23
8.0 to 15
Fatigue Strength, MPa 170
220 to 670
Poisson's Ratio 0.28
0.28
Rockwell B Hardness 78
84
Shear Modulus, GPa 77
76
Shear Strength, MPa 310
420 to 1010
Tensile Strength: Ultimate (UTS), MPa 490
690 to 1720
Tensile Strength: Yield (Proof), MPa 250
380 to 1310

Thermal Properties

Latent Heat of Fusion, J/g 280
280
Maximum Temperature: Corrosion, °C 530
390
Maximum Temperature: Mechanical, °C 890
620
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
27
Thermal Expansion, µm/m-K 11
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
3.0
Electrical Conductivity: Equal Weight (Specific), % IACS 3.4
3.5

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
7.5
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 2.3
2.0
Embodied Energy, MJ/kg 34
28
Embodied Water, L/kg 120
100

Common Calculations

PREN (Pitting Resistance) 18
14
Resilience: Ultimate (Unit Rupture Work), MJ/m3 95
88 to 130
Resilience: Unit (Modulus of Resilience), kJ/m3 160
380 to 4410
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 18
25 to 62
Strength to Weight: Bending, points 18
22 to 41
Thermal Diffusivity, mm2/s 6.7
7.3
Thermal Shock Resistance, points 16
25 to 62

Alloy Composition

Aluminum (Al), % 0 to 0.15
0
Carbon (C), % 0 to 0.030
0.15 to 0.4
Chromium (Cr), % 17 to 19
12 to 14
Iron (Fe), % 77.1 to 82.8
82.3 to 87.9
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0 to 0.5
0 to 0.75
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