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SAE-AISI A9 Steel vs. S21904 Stainless Steel

Both SAE-AISI A9 steel and S21904 stainless steel are iron alloys. They have 71% 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 S21904 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 74
78
Tensile Strength: Ultimate (UTS), MPa 770 to 2030
700 to 1000

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Melting Completion (Liquidus), °C 1460
1400
Melting Onset (Solidus), °C 1410
1350
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 35
14
Thermal Expansion, µm/m-K 12
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.9
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 9.2
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
15
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 4.7
3.0
Embodied Energy, MJ/kg 70
43
Embodied Water, L/kg 82
160

Common Calculations

PREN (Pitting Resistance) 10
25
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 28 to 73
25 to 36
Strength to Weight: Bending, points 24 to 46
23 to 29
Thermal Diffusivity, mm2/s 9.6
3.8
Thermal Shock Resistance, points 25 to 66
15 to 21

Alloy Composition

Carbon (C), % 0.45 to 0.55
0 to 0.040
Chromium (Cr), % 4.8 to 5.5
19 to 21.5
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 87 to 90.5
59.5 to 67.4
Manganese (Mn), % 0 to 0.5
8.0 to 10
Molybdenum (Mo), % 1.3 to 1.8
0
Nickel (Ni), % 1.3 to 1.8
5.5 to 7.5
Nitrogen (N), % 0
0.15 to 0.4
Phosphorus (P), % 0 to 0.030
0 to 0.045
Silicon (Si), % 1.0 to 1.2
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Vanadium (V), % 0.8 to 1.4
0

Comparable Variants