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S33550 Stainless Steel vs. AISI 309 Stainless Steel

Both S33550 stainless steel and AISI 309 stainless steel are iron alloys. They have a moderately high 91% of their average alloy composition in common.

For each property being compared, the top bar is S33550 stainless steel and the bottom bar is AISI 309 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
180 to 210
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 40
34 to 47
Fatigue Strength, MPa 270
250 to 280
Poisson's Ratio 0.27
0.27
Rockwell B Hardness 82
84
Shear Modulus, GPa 79
78
Shear Strength, MPa 470
420 to 470
Tensile Strength: Ultimate (UTS), MPa 680
600 to 710
Tensile Strength: Yield (Proof), MPa 310
260 to 350

Thermal Properties

Latent Heat of Fusion, J/g 300
290
Maximum Temperature: Corrosion, °C 470
440
Maximum Temperature: Mechanical, °C 1100
980
Melting Completion (Liquidus), °C 1400
1450
Melting Onset (Solidus), °C 1360
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 15
16
Thermal Expansion, µm/m-K 16
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.1
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 24
19
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 4.3
3.6
Embodied Energy, MJ/kg 61
51
Embodied Water, L/kg 190
170

Common Calculations

PREN (Pitting Resistance) 30
23
Resilience: Ultimate (Unit Rupture Work), MJ/m3 220
200 to 230
Resilience: Unit (Modulus of Resilience), kJ/m3 250
170 to 310
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 24
21 to 25
Strength to Weight: Bending, points 22
20 to 23
Thermal Diffusivity, mm2/s 3.9
4.3
Thermal Shock Resistance, points 15
14 to 16

Alloy Composition

Carbon (C), % 0.040 to 0.1
0 to 0.2
Cerium (Ce), % 0.025 to 0.070
0
Chromium (Cr), % 25 to 28
22 to 24
Iron (Fe), % 48.8 to 58.2
58 to 66
Lanthanum (La), % 0.025 to 0.070
0
Manganese (Mn), % 0 to 1.5
0 to 2.0
Nickel (Ni), % 16.5 to 20
12 to 15
Niobium (Nb), % 0.050 to 0.15
0
Nitrogen (N), % 0.18 to 0.25
0
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 0.75
Sulfur (S), % 0 to 0.030
0 to 0.030