Hastelloy C22 / N06022 180° LR Elbow | ASTM B366 Nickel Alloy Butt Weld Fitting For Corrosive Service
Hastelloy C22 / N06022 180° LR Elbow | ASTM B366 Nickel Alloy Butt Weld Fitting For Corrosive Service
What is Hastelloy C22 / N06022 180° LR Elbow
A Hastelloy C22 180° LR Elbow is a seamless or welded pipe fitting designed to reverse the flow direction in a high-performance piping system. Manufactured from UNS N06022 (W.Nr. 2.4602), a nickel-chromium-molybdenum-tungsten alloy, it offers exceptional resistance to a wide range of corrosive environments, including both oxidizing and reducing acids.
The "180°" designation allows for a complete U-shaped turn, while the "LR" (Long Radius) specification—where the centerline radius is 1.5 times the pipe diameter—ensures smooth fluid flow with minimal pressure drop and reduced erosion. Manufactured in accordance with ASTM B366 and ASME B16.9, these fittings are critical components in chemical processing, pharmaceutical, pollution control, and marine industries where reliability in extreme conditions is paramount.
Key Properties and Benefits
The value of this specific elbow lies entirely in its material, Hastelloy C22. Here are its most important characteristics:
-
"Universal" Corrosion Resistance: Unlike many materials that excel in only one type of environment, C22 is resistant to both oxidizing acids (like nitric acid and ferric chlorides) and reducing acids (like sulfuric and hydrochloric acids) . This versatility makes it a top choice for complex and unpredictable chemical processes.
-
Resistance to Localized Corrosion: It offers outstanding protection against pitting, crevice corrosion, and stress-corrosion cracking (SCC) , which are common failure modes in chloride-rich environments .
-
Excellent Weldability: The alloy is designed to resist the formation of harmful grain-boundary precipitates in the heat-affected zone during welding. This means it can be used in the "as-welded" condition without needing a post-weld heat treatment to restore its corrosion resistance .
Properties of Hastelloy C22 Pipe Fittings:
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Not subject to pitting, crack consumption and stress erosion
-
Special protection for reducing and oxidizing media
-
Incredible protection for oxidizing aqueous media
-
Excellent protection against various complex cycle conditions, including solid oxidants such as ferric acid, anhydride and seawater and brackish water alignments
-
Development of grain restriction against welding heat affected zone
-
Amazing solderability
Chemical Composition of Hastelloy C22 / N06022
|
Grade |
C |
Mn |
Si |
S |
Co |
Ni |
Cr |
Fe |
Mo |
P |
|
C22 |
0.010 max |
0.50 max |
0.08 max |
0.02 max |
2.50 max |
50.015 min* |
20.00 – 22.50 |
2.00 – 6.00 |
12.50 – 14.50 |
0.02 max |
Mechanical Properties of Hastelloy C22 / N06022
|
Element |
Density |
Melting Point |
Tensile Strength |
Yield Strength (0.2%Offset) |
Elongation |
|
Hastelloy C22 |
8.69 g/cm3 |
1399 °C (2550 °F) |
Psi – 1,00,000 , MPa – 690 |
Psi – 45000 , MPa – 310 |
45 % |
Equivalent Grade of Hastelloy C22
|
STANDARD |
WERKSTOFF NR. |
UNS |
JIS |
GOST |
EN |
OR |
|
Hastelloy C22 |
2.4602 |
N06022 |
NW 6022 |
– |
NiCr21Mo14W |
– |
Surface Treatment Options for Hastelloy C22 / N06022 180° LR Elbow
|
BPE Surface Finish Code |
CSI Surface Finish Code |
Product Contact Surface (Max Ra)* |
Product Contact Surface Finish Treatment (ID) |
Non-Product Contact Surface (Max Ra) |
Non-Product Contact Surface Finish Treatment (OD) |
Dimensions & Tolerances (BPE) or (CSI) |
|---|---|---|---|---|---|---|
|
SF1 |
PL |
20 µ-inch (0.51 µm) |
Mechanical Polish/As Drawn |
32 µ-inch (0.81 µm) |
Mechanical Polish |
BPE |
|
SF5 |
PO |
20 µ-inch (0.51 µm) |
Electropolished |
32 µ-inch (0.81 µm) |
Mechanical Polish |
BPE |
|
SF6 |
P25 |
25 µ-inch (0.64 µm) |
Electropolished |
32 µ-inch (0.81 µm) |
Mechanical Polish |
BPE |
|
N/A |
PU |
Mill Finish |
Unpolished/Mill |
Mill Finish |
Unpolished/Mill |
CSI |
Applications of Hastelloy C22 Pipe Fittings:
- Pharmaceutical companies use composite C-22 pipe fittings to avoid pollution caused by consumer disappointment
- Cellophane manufacturing
- Chlorination framework
- Combustion scrubber frame
- Compound interaction industries in equipment such as exhaust scrubbers, chlorination frames, sulfur dioxide scrubbers, saccharification and paper bleaching plants, pickling frames, and atomic fuel reprocessing
- Waste water treatment
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