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S21900 Stainless Steel vs. S21800 Stainless Steel

Both S21900 stainless steel and S21800 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. There are 30 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is S21900 stainless steel and the bottom bar is S21800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
210
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 50
40
Fatigue Strength, MPa 380
330
Poisson's Ratio 0.28
0.28
Reduction in Area, % 57
62
Shear Modulus, GPa 78
75
Shear Strength, MPa 510
510
Tensile Strength: Ultimate (UTS), MPa 710
740
Tensile Strength: Yield (Proof), MPa 390
390

Thermal Properties

Latent Heat of Fusion, J/g 290
340
Maximum Temperature: Corrosion, °C 420
410
Maximum Temperature: Mechanical, °C 980
900
Melting Completion (Liquidus), °C 1400
1360
Melting Onset (Solidus), °C 1350
1310
Specific Heat Capacity, J/kg-K 480
500
Thermal Expansion, µm/m-K 17
16

Otherwise Unclassified Properties

Base Metal Price, % relative 15
15
Density, g/cm3 7.7
7.5
Embodied Carbon, kg CO2/kg material 3.0
3.1
Embodied Energy, MJ/kg 43
45
Embodied Water, L/kg 160
150

Common Calculations

PREN (Pitting Resistance) 25
19
Resilience: Ultimate (Unit Rupture Work), MJ/m3 300
250
Resilience: Unit (Modulus of Resilience), kJ/m3 380
390
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
26
Strength to Weight: Axial, points 26
27
Strength to Weight: Bending, points 23
24
Thermal Shock Resistance, points 15
17

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.1
Chromium (Cr), % 19 to 21.5
16 to 18
Iron (Fe), % 59.4 to 67.4
59.1 to 65.4
Manganese (Mn), % 8.0 to 10
7.0 to 9.0
Nickel (Ni), % 5.5 to 7.5
8.0 to 9.0
Nitrogen (N), % 0.15 to 0.4
0.080 to 0.18
Phosphorus (P), % 0 to 0.045
0 to 0.060
Silicon (Si), % 0 to 1.0
3.5 to 4.5
Sulfur (S), % 0 to 0.030
0 to 0.030