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AISI 317LMN Stainless Steel vs. SAE-AISI P21 Steel

Both AISI 317LMN stainless steel and SAE-AISI P21 steel are iron alloys. They have 65% of their average alloy composition in common. There are 23 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 AISI 317LMN 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 79
73
Tensile Strength: Ultimate (UTS), MPa 620
1130

Thermal Properties

Latent Heat of Fusion, J/g 290
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 14
41
Thermal Expansion, µm/m-K 16
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
7.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
9.0

Otherwise Unclassified Properties

Base Metal Price, % relative 24
6.5
Density, g/cm3 8.0
7.9
Embodied Carbon, kg CO2/kg material 4.8
2.3
Embodied Energy, MJ/kg 65
32
Embodied Water, L/kg 170
62

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 22
40
Strength to Weight: Bending, points 20
31
Thermal Diffusivity, mm2/s 3.8
11
Thermal Shock Resistance, points 14
37

Alloy Composition

Carbon (C), % 0 to 0.030
0.18 to 0.22
Chromium (Cr), % 17 to 20
0 to 0.5
Cobalt (Co), % 0
1.1 to 1.3
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 54.4 to 65.4
92.1 to 94.2
Manganese (Mn), % 0 to 2.0
0.35 to 0.72
Molybdenum (Mo), % 4.0 to 5.0
0
Nickel (Ni), % 13.5 to 17.5
3.9 to 4.3
Nitrogen (N), % 0.1 to 0.2
0
Phosphorus (P), % 0 to 0.045
0 to 0.030
Silicon (Si), % 0 to 0.75
0.2 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.030
Vanadium (V), % 0
0.15 to 0.25