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EN 1.4945 Stainless Steel vs. SAE-AISI P21 Steel

Both EN 1.4945 stainless steel and SAE-AISI P21 steel are iron alloys. They have 67% of their average alloy composition in common. There are 23 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 EN 1.4945 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 640 to 740
1130

Thermal Properties

Latent Heat of Fusion, J/g 290
250
Melting Completion (Liquidus), °C 1490
1450
Melting Onset (Solidus), °C 1440
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 14
41
Thermal Expansion, µm/m-K 17
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
7.9
Electrical Conductivity: Equal Weight (Specific), % IACS 3.2
9.0

Otherwise Unclassified Properties

Base Metal Price, % relative 30
6.5
Density, g/cm3 8.1
7.9
Embodied Carbon, kg CO2/kg material 5.0
2.3
Embodied Energy, MJ/kg 73
32
Embodied Water, L/kg 150
62

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 22 to 25
40
Strength to Weight: Bending, points 20 to 22
31
Thermal Diffusivity, mm2/s 3.7
11
Thermal Shock Resistance, points 14 to 16
37

Alloy Composition

Carbon (C), % 0.040 to 0.1
0.18 to 0.22
Chromium (Cr), % 15.5 to 17.5
0 to 0.5
Cobalt (Co), % 0
1.1 to 1.3
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 57.9 to 65.7
92.1 to 94.2
Manganese (Mn), % 0 to 1.5
0.35 to 0.72
Nickel (Ni), % 15.5 to 17.5
3.9 to 4.3
Niobium (Nb), % 0.4 to 1.2
0
Nitrogen (N), % 0.060 to 0.14
0
Phosphorus (P), % 0 to 0.035
0 to 0.030
Silicon (Si), % 0.3 to 0.6
0.2 to 0.4
Sulfur (S), % 0 to 0.015
0 to 0.030
Tungsten (W), % 2.5 to 3.5
0
Vanadium (V), % 0
0.15 to 0.25