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S21904 Stainless Steel vs. SAE-AISI A2 Steel

Both S21904 stainless steel and SAE-AISI A2 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 (9, in this case) are not shown.

For each property being compared, the top bar is S21904 stainless steel and the bottom bar is SAE-AISI A2 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
74
Tensile Strength: Ultimate (UTS), MPa 700 to 1000
710 to 2040

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

PREN (Pitting Resistance) 25
8.9
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 25 to 36
25 to 73
Strength to Weight: Bending, points 23 to 29
23 to 46
Thermal Diffusivity, mm2/s 3.8
10
Thermal Shock Resistance, points 15 to 21
25 to 71

Alloy Composition

Carbon (C), % 0 to 0.040
1.0 to 1.1
Chromium (Cr), % 19 to 21.5
4.8 to 5.5
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 59.5 to 67.4
89.4 to 93.3
Manganese (Mn), % 8.0 to 10
0 to 1.0
Molybdenum (Mo), % 0
0.9 to 1.4
Nickel (Ni), % 5.5 to 7.5
0 to 0.3
Nitrogen (N), % 0.15 to 0.4
0
Phosphorus (P), % 0 to 0.045
0 to 0.030
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Vanadium (V), % 0
0.15 to 0.5

Comparable Variants