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S44800 Stainless Steel vs. S21640 Stainless Steel

Both S44800 stainless steel and S21640 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 87% of their average alloy composition in common. There are 33 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is S44800 stainless steel and the bottom bar is S21640 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
230
Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 23
46
Fatigue Strength, MPa 300
320
Poisson's Ratio 0.27
0.28
Shear Modulus, GPa 82
78
Shear Strength, MPa 370
520
Tensile Strength: Ultimate (UTS), MPa 590
740
Tensile Strength: Yield (Proof), MPa 450
350

Thermal Properties

Latent Heat of Fusion, J/g 300
290
Maximum Temperature: Corrosion, °C 460
490
Maximum Temperature: Mechanical, °C 1100
940
Melting Completion (Liquidus), °C 1460
1430
Melting Onset (Solidus), °C 1410
1380
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 17
15
Thermal Expansion, µm/m-K 11
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.6
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 3.0
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 19
17
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 3.8
3.6
Embodied Energy, MJ/kg 52
51
Embodied Water, L/kg 190
150

Common Calculations

PREN (Pitting Resistance) 42
26
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
280
Resilience: Unit (Modulus of Resilience), kJ/m3 480
300
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 21
27
Strength to Weight: Bending, points 20
23
Thermal Diffusivity, mm2/s 4.6
4.0
Thermal Shock Resistance, points 19
16

Alloy Composition

Carbon (C), % 0 to 0.010
0 to 0.080
Chromium (Cr), % 28 to 30
17.5 to 19.5
Copper (Cu), % 0 to 0.15
0
Iron (Fe), % 62.6 to 66.5
63 to 74.3
Manganese (Mn), % 0 to 0.3
3.5 to 6.5
Molybdenum (Mo), % 3.5 to 4.2
0.5 to 2.0
Nickel (Ni), % 2.0 to 2.5
4.0 to 6.5
Niobium (Nb), % 0
0.1 to 1.0
Nitrogen (N), % 0 to 0.020
0.080 to 0.3
Phosphorus (P), % 0 to 0.025
0 to 0.060
Silicon (Si), % 0 to 0.2
0 to 1.0
Sulfur (S), % 0 to 0.020
0 to 0.030