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N08904 Stainless Steel vs. S21800 Stainless Steel

Both N08904 stainless steel and S21800 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 73% 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 N08904 stainless steel and the bottom bar is S21800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170
210
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 38
40
Fatigue Strength, MPa 200
330
Poisson's Ratio 0.28
0.28
Rockwell B Hardness 77
88
Shear Modulus, GPa 79
75
Shear Strength, MPa 370
510
Tensile Strength: Ultimate (UTS), MPa 540
740
Tensile Strength: Yield (Proof), MPa 240
390

Thermal Properties

Latent Heat of Fusion, J/g 300
340
Maximum Temperature: Corrosion, °C 430
410
Maximum Temperature: Mechanical, °C 1100
900
Melting Completion (Liquidus), °C 1440
1360
Melting Onset (Solidus), °C 1390
1310
Specific Heat Capacity, J/kg-K 470
500
Thermal Expansion, µm/m-K 16
16

Otherwise Unclassified Properties

Base Metal Price, % relative 32
15
Density, g/cm3 8.1
7.5
Embodied Carbon, kg CO2/kg material 5.8
3.1
Embodied Energy, MJ/kg 79
45
Embodied Water, L/kg 200
150

Common Calculations

PREN (Pitting Resistance) 37
19
Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
250
Resilience: Unit (Modulus of Resilience), kJ/m3 150
390
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
26
Strength to Weight: Axial, points 19
27
Strength to Weight: Bending, points 18
24
Thermal Shock Resistance, points 12
17

Alloy Composition

Carbon (C), % 0 to 0.020
0 to 0.1
Chromium (Cr), % 19 to 23
16 to 18
Copper (Cu), % 1.0 to 2.0
0
Iron (Fe), % 38.8 to 53
59.1 to 65.4
Manganese (Mn), % 0 to 2.0
7.0 to 9.0
Molybdenum (Mo), % 4.0 to 5.0
0
Nickel (Ni), % 23 to 28
8.0 to 9.0
Nitrogen (N), % 0 to 0.1
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 0.035
0 to 0.030