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SAE-AISI A7 Steel vs. S21800 Stainless Steel

Both SAE-AISI A7 steel and S21800 stainless steel are iron alloys. They have 69% of their average alloy composition in common. There are 20 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI A7 steel and the bottom bar is S21800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
75
Tensile Strength: Ultimate (UTS), MPa 800 to 2150
740

Thermal Properties

Latent Heat of Fusion, J/g 260
340
Melting Completion (Liquidus), °C 1470
1360
Melting Onset (Solidus), °C 1430
1310
Specific Heat Capacity, J/kg-K 470
500
Thermal Expansion, µm/m-K 12
16

Otherwise Unclassified Properties

Base Metal Price, % relative 10
15
Density, g/cm3 7.7
7.5
Embodied Carbon, kg CO2/kg material 13
3.1
Embodied Energy, MJ/kg 200
45
Embodied Water, L/kg 100
150

Common Calculations

PREN (Pitting Resistance) 11
19
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
26
Strength to Weight: Axial, points 29 to 77
27
Strength to Weight: Bending, points 25 to 48
24
Thermal Shock Resistance, points 27 to 72
17

Alloy Composition

Carbon (C), % 2.0 to 2.9
0 to 0.1
Chromium (Cr), % 5.0 to 5.8
16 to 18
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 81.4 to 87.7
59.1 to 65.4
Manganese (Mn), % 0 to 0.8
7.0 to 9.0
Molybdenum (Mo), % 0.9 to 1.4
0
Nickel (Ni), % 0 to 0.3
8.0 to 9.0
Nitrogen (N), % 0
0.080 to 0.18
Phosphorus (P), % 0 to 0.030
0 to 0.060
Silicon (Si), % 0 to 0.5
3.5 to 4.5
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