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S21640 Stainless Steel vs. AISI 409Cb Stainless Steel

Both S21640 stainless steel and AISI 409Cb stainless steel are iron alloys. Both are furnished in the annealed condition. They have 81% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is S21640 stainless steel and the bottom bar is AISI 409Cb stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 46
24
Fatigue Strength, MPa 320
140
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
75
Shear Strength, MPa 520
270
Tensile Strength: Ultimate (UTS), MPa 740
420
Tensile Strength: Yield (Proof), MPa 350
200

Thermal Properties

Latent Heat of Fusion, J/g 290
270
Maximum Temperature: Corrosion, °C 490
440
Maximum Temperature: Mechanical, °C 940
710
Melting Completion (Liquidus), °C 1430
1450
Melting Onset (Solidus), °C 1380
1410
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 15
25
Thermal Expansion, µm/m-K 17
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.8
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 17
8.5
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 3.6
2.2
Embodied Energy, MJ/kg 51
31
Embodied Water, L/kg 150
94

Common Calculations

PREN (Pitting Resistance) 26
11
Resilience: Ultimate (Unit Rupture Work), MJ/m3 280
83
Resilience: Unit (Modulus of Resilience), kJ/m3 300
100
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 27
15
Strength to Weight: Bending, points 23
16
Thermal Diffusivity, mm2/s 4.0
6.7
Thermal Shock Resistance, points 16
15

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.060
Chromium (Cr), % 17.5 to 19.5
10.5 to 11.7
Iron (Fe), % 63 to 74.3
84.9 to 89.5
Manganese (Mn), % 3.5 to 6.5
0 to 1.0
Molybdenum (Mo), % 0.5 to 2.0
0
Nickel (Ni), % 4.0 to 6.5
0 to 0.5
Niobium (Nb), % 0.1 to 1.0
0 to 0.75
Nitrogen (N), % 0.080 to 0.3
0
Phosphorus (P), % 0 to 0.060
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.040