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AISI 440A Stainless Steel vs. AISI 420 Stainless Steel

Both AISI 440A stainless steel and AISI 420 stainless steel are iron alloys. They have a very high 95% of their average alloy composition in common. There are 31 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 440A stainless steel and the bottom bar is AISI 420 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 5.0 to 20
8.0 to 15
Fatigue Strength, MPa 270 to 790
220 to 670
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
76
Shear Strength, MPa 450 to 1040
420 to 1010
Tensile Strength: Ultimate (UTS), MPa 730 to 1790
690 to 1720
Tensile Strength: Yield (Proof), MPa 420 to 1650
380 to 1310

Thermal Properties

Latent Heat of Fusion, J/g 280
280
Maximum Temperature: Corrosion, °C 400
390
Maximum Temperature: Mechanical, °C 760
620
Melting Completion (Liquidus), °C 1480
1510
Melting Onset (Solidus), °C 1370
1450
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 23
27
Thermal Expansion, µm/m-K 10
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
3.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
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 2.2
2.0
Embodied Energy, MJ/kg 31
28
Embodied Water, L/kg 120
100

Common Calculations

PREN (Pitting Resistance) 18
14
Resilience: Ultimate (Unit Rupture Work), MJ/m3 87 to 120
88 to 130
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 26 to 65
25 to 62
Strength to Weight: Bending, points 23 to 43
22 to 41
Thermal Diffusivity, mm2/s 6.2
7.3
Thermal Shock Resistance, points 26 to 65
25 to 62

Alloy Composition

Carbon (C), % 0.6 to 0.75
0.15 to 0.4
Chromium (Cr), % 16 to 18
12 to 14
Iron (Fe), % 78.4 to 83.4
82.3 to 87.9
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 0 to 0.75
0 to 0.5
Nickel (Ni), % 0
0 to 0.75
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.030

Comparable Variants