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SAE-AISI P21 Steel vs. S32506 Stainless Steel

Both SAE-AISI P21 steel and S32506 stainless steel are iron alloys. They have 69% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI P21 steel and the bottom bar is S32506 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.27
Rockwell C Hardness 35
28
Shear Modulus, GPa 73
81
Tensile Strength: Ultimate (UTS), MPa 1130
710

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Melting Completion (Liquidus), °C 1450
1450
Melting Onset (Solidus), °C 1410
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 41
16
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.9
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 9.0
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
20
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 2.3
3.9
Embodied Energy, MJ/kg 32
54
Embodied Water, L/kg 62
180

Common Calculations

Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 40
25
Strength to Weight: Bending, points 31
23
Thermal Diffusivity, mm2/s 11
4.3
Thermal Shock Resistance, points 37
19

Alloy Composition

Carbon (C), % 0.18 to 0.22
0 to 0.030
Chromium (Cr), % 0 to 0.5
24 to 26
Cobalt (Co), % 1.1 to 1.3
0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 92.1 to 94.2
60.8 to 67.4
Manganese (Mn), % 0.35 to 0.72
0 to 1.0
Molybdenum (Mo), % 0
3.0 to 3.5
Nickel (Ni), % 3.9 to 4.3
5.5 to 7.2
Nitrogen (N), % 0
0.080 to 0.2
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.2 to 0.4
0 to 0.9
Sulfur (S), % 0 to 0.030
0 to 0.015
Tungsten (W), % 0
0.050 to 0.3
Vanadium (V), % 0.15 to 0.25
0