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S15500 Stainless Steel vs. SAE-AISI P21 Steel

Both S15500 stainless steel and SAE-AISI P21 steel are iron alloys. They have 81% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is S15500 stainless steel and the bottom bar is SAE-AISI P21 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.28
0.29
Rockwell C Hardness 27 to 46
35
Shear Modulus, GPa 75
73
Tensile Strength: Ultimate (UTS), MPa 890 to 1490
1130

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Melting Completion (Liquidus), °C 1430
1450
Melting Onset (Solidus), °C 1380
1410
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 17
41
Thermal Expansion, µm/m-K 11
12

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 13
6.5
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 2.7
2.3
Embodied Energy, MJ/kg 39
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 32 to 53
40
Strength to Weight: Bending, points 26 to 37
31
Thermal Diffusivity, mm2/s 4.6
11
Thermal Shock Resistance, points 30 to 50
37

Alloy Composition

Carbon (C), % 0 to 0.070
0.18 to 0.22
Chromium (Cr), % 14 to 15.5
0 to 0.5
Cobalt (Co), % 0
1.1 to 1.3
Copper (Cu), % 2.5 to 4.5
0 to 0.25
Iron (Fe), % 71.9 to 79.9
92.1 to 94.2
Manganese (Mn), % 0 to 1.0
0.35 to 0.72
Nickel (Ni), % 3.5 to 5.5
3.9 to 4.3
Niobium (Nb), % 0.15 to 0.45
0
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0 to 1.0
0.2 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.030
Vanadium (V), % 0
0.15 to 0.25