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SAE-AISI A9 Steel vs. S44800 Stainless Steel

Both SAE-AISI A9 steel and S44800 stainless steel are iron alloys. They have 73% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI A9 steel and the bottom bar is S44800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 74
82
Tensile Strength: Ultimate (UTS), MPa 770 to 2030
590

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1410
1410
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 35
17
Thermal Expansion, µm/m-K 12
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.9
2.6
Electrical Conductivity: Equal Weight (Specific), % IACS 9.2
3.0

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
19
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 4.7
3.8
Embodied Energy, MJ/kg 70
52
Embodied Water, L/kg 82
190

Common Calculations

PREN (Pitting Resistance) 10
42
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 28 to 73
21
Strength to Weight: Bending, points 24 to 46
20
Thermal Diffusivity, mm2/s 9.6
4.6
Thermal Shock Resistance, points 25 to 66
19

Alloy Composition

Carbon (C), % 0.45 to 0.55
0 to 0.010
Chromium (Cr), % 4.8 to 5.5
28 to 30
Copper (Cu), % 0 to 0.25
0 to 0.15
Iron (Fe), % 87 to 90.5
62.6 to 66.5
Manganese (Mn), % 0 to 0.5
0 to 0.3
Molybdenum (Mo), % 1.3 to 1.8
3.5 to 4.2
Nickel (Ni), % 1.3 to 1.8
2.0 to 2.5
Nitrogen (N), % 0
0 to 0.020
Phosphorus (P), % 0 to 0.030
0 to 0.025
Silicon (Si), % 1.0 to 1.2
0 to 0.2
Sulfur (S), % 0 to 0.030
0 to 0.020
Vanadium (V), % 0.8 to 1.4
0