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S21800 Stainless Steel vs. S20161 Stainless Steel

Both S21800 stainless steel and S20161 stainless steel are iron alloys. Both are furnished in the annealed condition. They have a moderately high 92% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is S21800 stainless steel and the bottom bar is S20161 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
250
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 40
46
Fatigue Strength, MPa 330
360
Poisson's Ratio 0.28
0.28
Reduction in Area, % 62
45
Shear Modulus, GPa 75
76
Shear Strength, MPa 510
690
Tensile Strength: Ultimate (UTS), MPa 740
980
Tensile Strength: Yield (Proof), MPa 390
390

Thermal Properties

Latent Heat of Fusion, J/g 340
330
Maximum Temperature: Corrosion, °C 410
410
Maximum Temperature: Mechanical, °C 900
870
Melting Completion (Liquidus), °C 1360
1380
Melting Onset (Solidus), °C 1310
1330
Specific Heat Capacity, J/kg-K 500
490
Thermal Expansion, µm/m-K 16
16

Otherwise Unclassified Properties

Base Metal Price, % relative 15
12
Density, g/cm3 7.5
7.5
Embodied Carbon, kg CO2/kg material 3.1
2.7
Embodied Energy, MJ/kg 45
39
Embodied Water, L/kg 150
130

Common Calculations

PREN (Pitting Resistance) 19
19
Resilience: Ultimate (Unit Rupture Work), MJ/m3 250
360
Resilience: Unit (Modulus of Resilience), kJ/m3 390
390
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 26
26
Strength to Weight: Axial, points 27
36
Strength to Weight: Bending, points 24
29
Thermal Shock Resistance, points 17
22

Alloy Composition

Carbon (C), % 0 to 0.1
0 to 0.15
Chromium (Cr), % 16 to 18
15 to 18
Iron (Fe), % 59.1 to 65.4
65.6 to 73.9
Manganese (Mn), % 7.0 to 9.0
4.0 to 6.0
Nickel (Ni), % 8.0 to 9.0
4.0 to 6.0
Nitrogen (N), % 0.080 to 0.18
0.080 to 0.2
Phosphorus (P), % 0 to 0.060
0 to 0.040
Silicon (Si), % 3.5 to 4.5
3.0 to 4.0
Sulfur (S), % 0 to 0.030
0 to 0.040