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S21800 Stainless Steel vs. S32550 Stainless Steel

Both S21800 stainless steel and S32550 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 86% of their average alloy composition in common. There are 30 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 S21800 stainless steel and the bottom bar is S32550 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
260
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 40
21
Fatigue Strength, MPa 330
400
Poisson's Ratio 0.28
0.27
Reduction in Area, % 62
57
Shear Modulus, GPa 75
80
Shear Strength, MPa 510
540
Tensile Strength: Ultimate (UTS), MPa 740
860
Tensile Strength: Yield (Proof), MPa 390
620

Thermal Properties

Latent Heat of Fusion, J/g 340
300
Maximum Temperature: Corrosion, °C 410
450
Maximum Temperature: Mechanical, °C 900
1100
Melting Completion (Liquidus), °C 1360
1440
Melting Onset (Solidus), °C 1310
1390
Specific Heat Capacity, J/kg-K 500
480
Thermal Expansion, µm/m-K 16
13

Otherwise Unclassified Properties

Base Metal Price, % relative 15
20
Density, g/cm3 7.5
7.8
Embodied Carbon, kg CO2/kg material 3.1
3.8
Embodied Energy, MJ/kg 45
53
Embodied Water, L/kg 150
180

Common Calculations

PREN (Pitting Resistance) 19
40
Resilience: Ultimate (Unit Rupture Work), MJ/m3 250
160
Resilience: Unit (Modulus of Resilience), kJ/m3 390
940
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 26
25
Strength to Weight: Axial, points 27
31
Strength to Weight: Bending, points 24
26
Thermal Shock Resistance, points 17
23

Alloy Composition

Carbon (C), % 0 to 0.1
0 to 0.040
Chromium (Cr), % 16 to 18
24 to 27
Copper (Cu), % 0
1.5 to 2.5
Iron (Fe), % 59.1 to 65.4
57.2 to 67
Manganese (Mn), % 7.0 to 9.0
0 to 1.5
Molybdenum (Mo), % 0
2.9 to 3.9
Nickel (Ni), % 8.0 to 9.0
4.5 to 6.5
Nitrogen (N), % 0.080 to 0.18
0.1 to 0.25
Phosphorus (P), % 0 to 0.060
0 to 0.040
Silicon (Si), % 3.5 to 4.5
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030