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S33550 Stainless Steel vs. AISI 445 Stainless Steel

Both S33550 stainless steel and AISI 445 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 75% 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 445 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
160
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 40
25
Fatigue Strength, MPa 270
160
Poisson's Ratio 0.27
0.28
Rockwell B Hardness 82
71
Shear Modulus, GPa 79
78
Shear Strength, MPa 470
310
Tensile Strength: Ultimate (UTS), MPa 680
480
Tensile Strength: Yield (Proof), MPa 310
230

Thermal Properties

Latent Heat of Fusion, J/g 300
290
Maximum Temperature: Corrosion, °C 470
480
Maximum Temperature: Mechanical, °C 1100
950
Melting Completion (Liquidus), °C 1400
1440
Melting Onset (Solidus), °C 1360
1390
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 15
21
Thermal Expansion, µm/m-K 16
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.1
2.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
3.0

Otherwise Unclassified Properties

Base Metal Price, % relative 24
12
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 4.3
2.6
Embodied Energy, MJ/kg 61
38
Embodied Water, L/kg 190
130

Common Calculations

PREN (Pitting Resistance) 30
20
Resilience: Ultimate (Unit Rupture Work), MJ/m3 220
98
Resilience: Unit (Modulus of Resilience), kJ/m3 250
140
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 24
17
Strength to Weight: Bending, points 22
18
Thermal Diffusivity, mm2/s 3.9
5.6
Thermal Shock Resistance, points 15
16

Alloy Composition

Carbon (C), % 0.040 to 0.1
0 to 0.020
Cerium (Ce), % 0.025 to 0.070
0
Chromium (Cr), % 25 to 28
19 to 21
Copper (Cu), % 0
0.3 to 0.6
Iron (Fe), % 48.8 to 58.2
74.9 to 80.7
Lanthanum (La), % 0.025 to 0.070
0
Manganese (Mn), % 0 to 1.5
0 to 1.0
Nickel (Ni), % 16.5 to 20
0 to 0.6
Niobium (Nb), % 0.050 to 0.15
0 to 0.8
Nitrogen (N), % 0.18 to 0.25
0 to 0.030
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.012