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S21900 Stainless Steel vs. S21640 Stainless Steel

Both S21900 stainless steel and S21640 stainless steel are iron alloys. Both are furnished in the annealed condition. They have a moderately high 93% of their average alloy composition in common. There are 33 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 S21900 stainless steel and the bottom bar is S21640 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
230
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 50
46
Fatigue Strength, MPa 380
320
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
78
Shear Strength, MPa 510
520
Tensile Strength: Ultimate (UTS), MPa 710
740
Tensile Strength: Yield (Proof), MPa 390
350

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Corrosion, °C 420
490
Maximum Temperature: Mechanical, °C 980
940
Melting Completion (Liquidus), °C 1400
1430
Melting Onset (Solidus), °C 1350
1380
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 14
15
Thermal Expansion, µm/m-K 17
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 15
17
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 3.0
3.6
Embodied Energy, MJ/kg 43
51
Embodied Water, L/kg 160
150

Common Calculations

PREN (Pitting Resistance) 25
26
Resilience: Ultimate (Unit Rupture Work), MJ/m3 300
280
Resilience: Unit (Modulus of Resilience), kJ/m3 380
300
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 26
27
Strength to Weight: Bending, points 23
23
Thermal Diffusivity, mm2/s 3.8
4.0
Thermal Shock Resistance, points 15
16

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.080
Chromium (Cr), % 19 to 21.5
17.5 to 19.5
Iron (Fe), % 59.4 to 67.4
63 to 74.3
Manganese (Mn), % 8.0 to 10
3.5 to 6.5
Molybdenum (Mo), % 0
0.5 to 2.0
Nickel (Ni), % 5.5 to 7.5
4.0 to 6.5
Niobium (Nb), % 0
0.1 to 1.0
Nitrogen (N), % 0.15 to 0.4
0.080 to 0.3
Phosphorus (P), % 0 to 0.045
0 to 0.060
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030