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AISI 201LN Stainless Steel vs. S21904 Stainless Steel

Both AISI 201LN stainless steel and S21904 stainless steel are iron alloys. They have a moderately high 92% of their average alloy composition in common.

For each property being compared, the top bar is AISI 201LN stainless steel and the bottom bar is S21904 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 320
210 to 300
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 25 to 51
17 to 51
Fatigue Strength, MPa 340 to 540
380 to 550
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
78
Shear Strength, MPa 530 to 680
510 to 620
Tensile Strength: Ultimate (UTS), MPa 740 to 1060
700 to 1000
Tensile Strength: Yield (Proof), MPa 350 to 770
390 to 910

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Maximum Temperature: Corrosion, °C 410
430
Maximum Temperature: Mechanical, °C 880
980
Melting Completion (Liquidus), °C 1410
1400
Melting Onset (Solidus), °C 1370
1350
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 15
14
Thermal Expansion, µm/m-K 17
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 12
15
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 2.6
3.0
Embodied Energy, MJ/kg 38
43
Embodied Water, L/kg 140
160

Common Calculations

PREN (Pitting Resistance) 20
25
Resilience: Ultimate (Unit Rupture Work), MJ/m3 230 to 310
160 to 310
Resilience: Unit (Modulus of Resilience), kJ/m3 310 to 1520
380 to 2070
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 27 to 38
25 to 36
Strength to Weight: Bending, points 24 to 30
23 to 29
Thermal Diffusivity, mm2/s 4.0
3.8
Thermal Shock Resistance, points 16 to 23
15 to 21

Alloy Composition

Carbon (C), % 0 to 0.030
0 to 0.040
Chromium (Cr), % 16 to 17.5
19 to 21.5
Copper (Cu), % 0 to 1.0
0
Iron (Fe), % 67.9 to 73.5
59.5 to 67.4
Manganese (Mn), % 6.4 to 7.5
8.0 to 10
Nickel (Ni), % 4.0 to 5.0
5.5 to 7.5
Nitrogen (N), % 0.1 to 0.25
0.15 to 0.4
Phosphorus (P), % 0 to 0.045
0 to 0.045
Silicon (Si), % 0 to 0.75
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.030

Comparable Variants