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S21904 Stainless Steel vs. S21800 Stainless Steel

Both S21904 stainless steel and S21800 stainless steel are iron alloys. They have a moderately high 94% of their average alloy composition in common. There are 29 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 S21904 stainless steel and the bottom bar is S21800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 300
210
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 17 to 51
40
Fatigue Strength, MPa 380 to 550
330
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
75
Shear Strength, MPa 510 to 620
510
Tensile Strength: Ultimate (UTS), MPa 700 to 1000
740
Tensile Strength: Yield (Proof), MPa 390 to 910
390

Thermal Properties

Latent Heat of Fusion, J/g 290
340
Maximum Temperature: Corrosion, °C 430
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 160 to 310
250
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 2070
390
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
26
Strength to Weight: Axial, points 25 to 36
27
Strength to Weight: Bending, points 23 to 29
24
Thermal Shock Resistance, points 15 to 21
17

Alloy Composition

Carbon (C), % 0 to 0.040
0 to 0.1
Chromium (Cr), % 19 to 21.5
16 to 18
Iron (Fe), % 59.5 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