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SAE-AISI A7 Steel vs. S21904 Stainless Steel

Both SAE-AISI A7 steel and S21904 stainless steel are iron alloys. They have 70% of their average alloy composition in common. There are 22 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 A7 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 72
78
Tensile Strength: Ultimate (UTS), MPa 800 to 2150
700 to 1000

Thermal Properties

Latent Heat of Fusion, J/g 260
290
Melting Completion (Liquidus), °C 1470
1400
Melting Onset (Solidus), °C 1430
1350
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 37
14
Thermal Expansion, µm/m-K 12
17

Otherwise Unclassified Properties

Base Metal Price, % relative 10
15
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 13
3.0
Embodied Energy, MJ/kg 200
43
Embodied Water, L/kg 100
160

Common Calculations

PREN (Pitting Resistance) 11
25
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 29 to 77
25 to 36
Strength to Weight: Bending, points 25 to 48
23 to 29
Thermal Diffusivity, mm2/s 10
3.8
Thermal Shock Resistance, points 27 to 72
15 to 21

Alloy Composition

Carbon (C), % 2.0 to 2.9
0 to 0.040
Chromium (Cr), % 5.0 to 5.8
19 to 21.5
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 81.4 to 87.7
59.5 to 67.4
Manganese (Mn), % 0 to 0.8
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
Tungsten (W), % 0.5 to 1.5
0
Vanadium (V), % 3.9 to 5.2
0

Comparable Variants