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SAE-AISI A2 Steel vs. S21900 Stainless Steel

Both SAE-AISI A2 steel and S21900 stainless steel are iron alloys. They have 70% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI A2 steel and the bottom bar is S21900 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 710 to 2040
710

Thermal Properties

Latent Heat of Fusion, J/g 260
290
Melting Completion (Liquidus), °C 1450
1400
Melting Onset (Solidus), °C 1410
1350
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 38
14
Thermal Expansion, µm/m-K 11
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.2
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 9.5
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 5.5
15
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 2.7
3.0
Embodied Energy, MJ/kg 38
43
Embodied Water, L/kg 73
160

Common Calculations

PREN (Pitting Resistance) 8.9
25
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 25 to 73
26
Strength to Weight: Bending, points 23 to 46
23
Thermal Diffusivity, mm2/s 10
3.8
Thermal Shock Resistance, points 25 to 71
15

Alloy Composition

Carbon (C), % 1.0 to 1.1
0 to 0.080
Chromium (Cr), % 4.8 to 5.5
19 to 21.5
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 89.4 to 93.3
59.4 to 67.4
Manganese (Mn), % 0 to 1.0
8.0 to 10
Molybdenum (Mo), % 0.9 to 1.4
0
Nickel (Ni), % 0 to 0.3
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), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Vanadium (V), % 0.15 to 0.5
0