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SAE-AISI A9 Steel vs. AISI 420F Stainless Steel

Both SAE-AISI A9 steel and AISI 420F stainless steel are iron alloys. They have a moderately high 92% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI A9 steel and the bottom bar is AISI 420F stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 74
76
Tensile Strength: Ultimate (UTS), MPa 770 to 2030
740

Thermal Properties

Latent Heat of Fusion, J/g 280
270
Melting Completion (Liquidus), °C 1460
1440
Melting Onset (Solidus), °C 1410
1390
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 35
25
Thermal Expansion, µm/m-K 12
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.9
3.1
Electrical Conductivity: Equal Weight (Specific), % IACS 9.2
3.7

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
7.0
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 4.7
2.0
Embodied Energy, MJ/kg 70
28
Embodied Water, L/kg 82
100

Common Calculations

PREN (Pitting Resistance) 10
14
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 28 to 73
27
Strength to Weight: Bending, points 24 to 46
23
Thermal Diffusivity, mm2/s 9.6
6.8
Thermal Shock Resistance, points 25 to 66
27

Alloy Composition

Carbon (C), % 0.45 to 0.55
0.3 to 0.4
Chromium (Cr), % 4.8 to 5.5
12 to 14
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 87 to 90.5
82.4 to 87.6
Manganese (Mn), % 0 to 0.5
0 to 1.3
Molybdenum (Mo), % 1.3 to 1.8
0 to 0.5
Nickel (Ni), % 1.3 to 1.8
0
Phosphorus (P), % 0 to 0.030
0 to 0.060
Silicon (Si), % 1.0 to 1.2
0 to 1.0
Sulfur (S), % 0 to 0.030
0.15 to 0.35
Vanadium (V), % 0.8 to 1.4
0