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S21800 Stainless Steel vs. S21600 Stainless Steel

Both S21800 stainless steel and S21600 stainless steel are iron alloys. Both are furnished in the annealed condition. They have a moderately high 94% of their average alloy composition in common.

For each property being compared, the top bar is S21800 stainless steel and the bottom bar is S21600 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
200
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 40
46
Fatigue Strength, MPa 330
360
Poisson's Ratio 0.28
0.28
Reduction in Area, % 62
56
Rockwell B Hardness 88
86
Shear Modulus, GPa 75
79
Shear Strength, MPa 510
500
Tensile Strength: Ultimate (UTS), MPa 740
710
Tensile Strength: Yield (Proof), MPa 390
390

Thermal Properties

Latent Heat of Fusion, J/g 340
290
Maximum Temperature: Corrosion, °C 410
420
Maximum Temperature: Mechanical, °C 900
990
Melting Completion (Liquidus), °C 1360
1420
Melting Onset (Solidus), °C 1310
1380
Specific Heat Capacity, J/kg-K 500
480
Thermal Expansion, µm/m-K 16
17

Otherwise Unclassified Properties

Base Metal Price, % relative 15
17
Density, g/cm3 7.5
7.7
Embodied Carbon, kg CO2/kg material 3.1
3.6
Embodied Energy, MJ/kg 45
50
Embodied Water, L/kg 150
160

Common Calculations

PREN (Pitting Resistance) 19
34
Resilience: Ultimate (Unit Rupture Work), MJ/m3 250
270
Resilience: Unit (Modulus of Resilience), kJ/m3 390
370
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 26
25
Strength to Weight: Axial, points 27
25
Strength to Weight: Bending, points 24
23
Thermal Shock Resistance, points 17
15

Alloy Composition

Carbon (C), % 0 to 0.1
0 to 0.080
Chromium (Cr), % 16 to 18
17.5 to 22
Iron (Fe), % 59.1 to 65.4
57.6 to 67.8
Manganese (Mn), % 7.0 to 9.0
7.5 to 9.0
Molybdenum (Mo), % 0
2.0 to 3.0
Nickel (Ni), % 8.0 to 9.0
5.0 to 7.0
Nitrogen (N), % 0.080 to 0.18
0.25 to 0.5
Phosphorus (P), % 0 to 0.060
0 to 0.045
Silicon (Si), % 3.5 to 4.5
0 to 0.75
Sulfur (S), % 0 to 0.030
0 to 0.030