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S35000 Stainless Steel vs. SAE-AISI P21 Steel

Both S35000 stainless steel and SAE-AISI P21 steel are iron alloys. They have 80% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is S35000 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
Rockwell C Hardness 26 to 37
35
Shear Modulus, GPa 78
73
Tensile Strength: Ultimate (UTS), MPa 1300 to 1570
1130

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1410
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 16
41
Thermal Expansion, µm/m-K 11
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.3
7.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.6
9.0

Otherwise Unclassified Properties

Base Metal Price, % relative 14
6.5
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 3.2
2.3
Embodied Energy, MJ/kg 44
32
Embodied Water, L/kg 130
62

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 46 to 56
40
Strength to Weight: Bending, points 34 to 38
31
Thermal Diffusivity, mm2/s 4.4
11
Thermal Shock Resistance, points 42 to 51
37

Alloy Composition

Carbon (C), % 0.070 to 0.11
0.18 to 0.22
Chromium (Cr), % 16 to 17
0 to 0.5
Cobalt (Co), % 0
1.1 to 1.3
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 72.7 to 76.9
92.1 to 94.2
Manganese (Mn), % 0.5 to 1.3
0.35 to 0.72
Molybdenum (Mo), % 2.5 to 3.2
0
Nickel (Ni), % 4.0 to 5.0
3.9 to 4.3
Nitrogen (N), % 0.070 to 0.13
0
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0 to 0.5
0.2 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.030
Vanadium (V), % 0
0.15 to 0.25