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EN 1.4646 Stainless Steel vs. SAE-AISI P21 Steel

Both EN 1.4646 stainless steel and SAE-AISI P21 steel are iron alloys. They have 68% of their average alloy composition in common. There are 19 material properties with values for both materials. Properties with values for just one material (16, in this case) are not shown.

For each property being compared, the top bar is EN 1.4646 stainless steel and the bottom bar is SAE-AISI P21 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 77
73
Tensile Strength: Ultimate (UTS), MPa 750
1130

Thermal Properties

Latent Heat of Fusion, J/g 290
250
Melting Completion (Liquidus), °C 1390
1450
Melting Onset (Solidus), °C 1340
1410
Specific Heat Capacity, J/kg-K 480
470
Thermal Expansion, µm/m-K 17
12

Otherwise Unclassified Properties

Base Metal Price, % relative 13
6.5
Density, g/cm3 7.7
7.9
Embodied Carbon, kg CO2/kg material 2.8
2.3
Embodied Energy, MJ/kg 41
32
Embodied Water, L/kg 160
62

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 27
40
Strength to Weight: Bending, points 24
31
Thermal Shock Resistance, points 16
37

Alloy Composition

Carbon (C), % 0.020 to 0.1
0.18 to 0.22
Chromium (Cr), % 17 to 19
0 to 0.5
Cobalt (Co), % 0
1.1 to 1.3
Copper (Cu), % 1.5 to 3.0
0 to 0.25
Iron (Fe), % 59 to 67.3
92.1 to 94.2
Manganese (Mn), % 10.5 to 12.5
0.35 to 0.72
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 3.5 to 4.5
3.9 to 4.3
Nitrogen (N), % 0.2 to 0.3
0
Phosphorus (P), % 0 to 0.050
0 to 0.030
Silicon (Si), % 0 to 1.0
0.2 to 0.4
Sulfur (S), % 0 to 0.015
0 to 0.030
Vanadium (V), % 0
0.15 to 0.25