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S81921 Stainless Steel vs. S21800 Stainless Steel

Both S81921 stainless steel and S21800 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 86% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is S81921 stainless steel and the bottom bar is S21800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 260
210
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 29
40
Fatigue Strength, MPa 370
330
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 79
75
Shear Strength, MPa 460
510
Tensile Strength: Ultimate (UTS), MPa 710
740
Tensile Strength: Yield (Proof), MPa 500
390

Thermal Properties

Latent Heat of Fusion, J/g 290
340
Maximum Temperature: Corrosion, °C 430
410
Maximum Temperature: Mechanical, °C 990
900
Melting Completion (Liquidus), °C 1430
1360
Melting Onset (Solidus), °C 1390
1310
Specific Heat Capacity, J/kg-K 480
500
Thermal Expansion, µm/m-K 13
16

Otherwise Unclassified Properties

Base Metal Price, % relative 14
15
Density, g/cm3 7.7
7.5
Embodied Carbon, kg CO2/kg material 2.9
3.1
Embodied Energy, MJ/kg 41
45
Embodied Water, L/kg 150
150

Common Calculations

PREN (Pitting Resistance) 28
19
Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
250
Resilience: Unit (Modulus of Resilience), kJ/m3 630
390
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
26
Strength to Weight: Axial, points 25
27
Strength to Weight: Bending, points 23
24
Thermal Shock Resistance, points 20
17

Alloy Composition

Carbon (C), % 0 to 0.030
0 to 0.1
Chromium (Cr), % 19 to 22
16 to 18
Iron (Fe), % 66.7 to 75.9
59.1 to 65.4
Manganese (Mn), % 2.0 to 4.0
7.0 to 9.0
Molybdenum (Mo), % 1.0 to 2.0
0
Nickel (Ni), % 2.0 to 4.0
8.0 to 9.0
Nitrogen (N), % 0.14 to 0.2
0.080 to 0.18
Phosphorus (P), % 0 to 0.040
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