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AISI 309HCb Stainless Steel vs. S21800 Stainless Steel

Both AISI 309HCb stainless steel and S21800 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 88% 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 AISI 309HCb stainless steel and the bottom bar is S21800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
210
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 46
40
Fatigue Strength, MPa 210
330
Poisson's Ratio 0.28
0.28
Rockwell B Hardness 82
88
Shear Modulus, GPa 78
75
Shear Strength, MPa 410
510
Tensile Strength: Ultimate (UTS), MPa 590
740
Tensile Strength: Yield (Proof), MPa 230
390

Thermal Properties

Latent Heat of Fusion, J/g 300
340
Maximum Temperature: Corrosion, °C 510
410
Maximum Temperature: Mechanical, °C 1090
900
Melting Completion (Liquidus), °C 1420
1360
Melting Onset (Solidus), °C 1380
1310
Specific Heat Capacity, J/kg-K 480
500
Thermal Expansion, µm/m-K 16
16

Otherwise Unclassified Properties

Base Metal Price, % relative 23
15
Density, g/cm3 7.8
7.5
Embodied Carbon, kg CO2/kg material 4.1
3.1
Embodied Energy, MJ/kg 59
45
Embodied Water, L/kg 170
150

Common Calculations

PREN (Pitting Resistance) 23
19
Resilience: Ultimate (Unit Rupture Work), MJ/m3 210
250
Resilience: Unit (Modulus of Resilience), kJ/m3 130
390
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
26
Strength to Weight: Axial, points 21
27
Strength to Weight: Bending, points 20
24
Thermal Shock Resistance, points 13
17

Alloy Composition

Carbon (C), % 0.040 to 0.1
0 to 0.1
Chromium (Cr), % 22 to 24
16 to 18
Iron (Fe), % 56 to 66
59.1 to 65.4
Manganese (Mn), % 0 to 2.0
7.0 to 9.0
Nickel (Ni), % 12 to 16
8.0 to 9.0
Niobium (Nb), % 0 to 1.1
0
Nitrogen (N), % 0
0.080 to 0.18
Phosphorus (P), % 0 to 0.045
0 to 0.060
Silicon (Si), % 0 to 0.75
3.5 to 4.5
Sulfur (S), % 0 to 0.030
0 to 0.030