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EN 1.4971 Stainless Steel vs. SAE-AISI P21 Steel

Both EN 1.4971 stainless steel and SAE-AISI P21 steel are iron alloys. They have a modest 37% of their average alloy composition in common, which, by itself, doesn't mean much. There are 21 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 EN 1.4971 stainless steel and the bottom bar is SAE-AISI P21 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 81
73
Tensile Strength: Ultimate (UTS), MPa 800
1130

Thermal Properties

Latent Heat of Fusion, J/g 300
250
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1410
1410
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 13
41
Thermal Expansion, µm/m-K 15
12

Otherwise Unclassified Properties

Base Metal Price, % relative 70
6.5
Density, g/cm3 8.4
7.9
Embodied Carbon, kg CO2/kg material 7.6
2.3
Embodied Energy, MJ/kg 110
32
Embodied Water, L/kg 300
62

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 26
40
Strength to Weight: Bending, points 23
31
Thermal Diffusivity, mm2/s 3.4
11
Thermal Shock Resistance, points 19
37

Alloy Composition

Carbon (C), % 0.080 to 0.16
0.18 to 0.22
Chromium (Cr), % 20 to 22.5
0 to 0.5
Cobalt (Co), % 18.5 to 21
1.1 to 1.3
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 24.3 to 37.1
92.1 to 94.2
Manganese (Mn), % 0 to 2.0
0.35 to 0.72
Molybdenum (Mo), % 2.5 to 3.5
0
Nickel (Ni), % 19 to 21
3.9 to 4.3
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0.1 to 0.2
0
Phosphorus (P), % 0 to 0.035
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
Tungsten (W), % 2.0 to 3.0
0
Vanadium (V), % 0
0.15 to 0.25