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AISI 321 Stainless Steel vs. SAE-AISI M50 Steel

Both AISI 321 stainless steel and SAE-AISI M50 steel are iron alloys. They have 75% 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 AISI 321 stainless steel and the bottom bar is SAE-AISI M50 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
75
Tensile Strength: Ultimate (UTS), MPa 590 to 690
720 to 2250

Thermal Properties

Latent Heat of Fusion, J/g 290
260
Melting Completion (Liquidus), °C 1430
1480
Melting Onset (Solidus), °C 1400
1440
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 16
35
Thermal Expansion, µm/m-K 17
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
8.7
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
10

Otherwise Unclassified Properties

Base Metal Price, % relative 16
9.0
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 3.2
5.1
Embodied Energy, MJ/kg 45
74
Embodied Water, L/kg 140
83

Common Calculations

PREN (Pitting Resistance) 19
19
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 21 to 25
26 to 80
Strength to Weight: Bending, points 20 to 22
23 to 49
Thermal Diffusivity, mm2/s 4.1
9.7
Thermal Shock Resistance, points 13 to 15
21 to 66

Alloy Composition

Carbon (C), % 0 to 0.080
0.78 to 0.88
Chromium (Cr), % 17 to 19
3.8 to 4.5
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 65.3 to 74
87 to 90.4
Manganese (Mn), % 0 to 2.0
0.15 to 0.45
Molybdenum (Mo), % 0
3.9 to 4.8
Nickel (Ni), % 9.0 to 12
0 to 0.3
Nitrogen (N), % 0 to 0.1
0
Phosphorus (P), % 0 to 0.045
0 to 0.030
Silicon (Si), % 0 to 0.75
0.2 to 0.6
Sulfur (S), % 0 to 0.030
0 to 0.030
Titanium (Ti), % 0 to 0.7
0
Vanadium (V), % 0
0.8 to 1.3