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AISI 201L Stainless Steel vs. AISI 321 Stainless Steel

Both AISI 201L stainless steel and AISI 321 stainless steel are iron alloys. They have a moderately high 93% of their average alloy composition in common.

For each property being compared, the top bar is AISI 201L stainless steel and the bottom bar is AISI 321 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190 to 320
170 to 210
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 22 to 46
34 to 50
Fatigue Strength, MPa 270 to 530
220 to 270
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
77
Shear Strength, MPa 520 to 660
420 to 460
Tensile Strength: Ultimate (UTS), MPa 740 to 1040
590 to 690
Tensile Strength: Yield (Proof), MPa 290 to 790
220 to 350

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Maximum Temperature: Corrosion, °C 410
480
Maximum Temperature: Mechanical, °C 880
870
Melting Completion (Liquidus), °C 1410
1430
Melting Onset (Solidus), °C 1370
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 15
16
Thermal Expansion, µm/m-K 17
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 12
16
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 2.6
3.2
Embodied Energy, MJ/kg 38
45
Embodied Water, L/kg 140
140

Common Calculations

PREN (Pitting Resistance) 19
19
Resilience: Ultimate (Unit Rupture Work), MJ/m3 210 to 300
190 to 230
Resilience: Unit (Modulus of Resilience), kJ/m3 220 to 1570
130 to 310
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 27 to 37
21 to 25
Strength to Weight: Bending, points 24 to 30
20 to 22
Thermal Diffusivity, mm2/s 4.0
4.1
Thermal Shock Resistance, points 16 to 23
13 to 15

Alloy Composition

Carbon (C), % 0 to 0.030
0 to 0.080
Chromium (Cr), % 16 to 18
17 to 19
Iron (Fe), % 67.9 to 75
65.3 to 74
Manganese (Mn), % 5.5 to 7.5
0 to 2.0
Nickel (Ni), % 3.5 to 5.5
9.0 to 12
Nitrogen (N), % 0 to 0.25
0 to 0.1
Phosphorus (P), % 0 to 0.045
0 to 0.045
Silicon (Si), % 0 to 0.75
0 to 0.75
Sulfur (S), % 0 to 0.030
0 to 0.030
Titanium (Ti), % 0
0 to 0.7