Hastelloy C22 Pipe Fittings , ASTM B366 UNS N06022 Nickel Alloy 180° SR Return Bends
ASTM B366 UNS N06022 Nickel Alloy 180° SR Return Bends Hastelloy C22 Pipe Fittings B16.9
An ASTM B366 UNS N06022 180° SR Return Bend is a wrought (forged or seamless) nickel-alloy pipe fitting designed to reverse pipeline flow by 180°, routing it back parallel to its entry point. Manufactured from Hastelloy C22 — a Nickel-Chromium-Molybdenum-Tungsten alloy renowned for exceptional resistance to both oxidizing and reducing corrosive media — this fitting is produced under ASTM B366 (material specification) with dimensions generally per ASME B16.9. The "SR" (Short Radius) designation means its center-to-center return dimension equals 1.0 × Nominal Pipe Size (NPS), making it ideal for extremely tight spaces such as heat exchanger bundles.
Equivalent Grades of Hastelloy C22 Pipe Fittings , ASTM B366 UNS N06022 Nickel Alloy 180° SR Return Bend
| STANDARD | UNS | WERKSTOFF NR. | JIS | EN |
| Hastelloy C22 | N06022 | 2.4602 | NW 6022 | NiCr21Mo14W |
Chemical Composition % of Hastelloy C22 Pipe Fittings , ASTM B366 UNS N06022 Nickel Alloy 180° SR Return Bend
| % | Ni | Cr | Mo | Fe | W | Co | C | Mn | Si | V | P | S |
| Min. | Bal. | 20 | 12.5 | 2 | 2.5 | - | - | - | - | - | - | - |
| Max. | 22.5 | 14.5 | 6 | 3.5 | 2.5 | 0.015 | 0.5 | 0.08 | 0.35 | 0.02 | 0.02 |
Mechanical & Physical Properties of Hastelloy C22 Pipe Fittings , ASTM B366 UNS N06022 Nickel Alloy 180° SR Return Bend
| Density | 8.69 g/cm3 |
| Tensile Strength | 100000 Psi, 690 Mpa |
| Yield Strength (0.2%Offset) | 45000 Psi, 310 MPa |
| Melting Point | 1399 °C (2550 °F) |
| Elongation | 45 % |
Key Performance Advantages (Why C22 over C276?)
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Superior Universal Resistance: Hastelloy C22 offers better overall corrosion resistance than C276 (UNS N10276) in oxidizing media (e.g., ferric chloride, chlorine) while retaining outstanding resistance to reducing acids.
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Resistance to Pitting & Crevice Corrosion: Has a high Critical Pitting Temperature (CPT) and Crevice Corrosion Resistance, making it ideal for contaminated acids.
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Stress Corrosion Cracking (SCC): Highly resistant to chloride-induced SCC.
Application
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Chemical Processing: Handling hot contaminated acids (sulfuric, hydrochloric, phosphoric).
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Flue Gas Desulfurization (FGD): Ducts and dampers in coal-fired power plants.
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Pharmaceutical & Food: Where equipment must withstand harsh cleaning agents (bleach/chlorine).
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Waste Treatment: Hazardous waste incinerators and scrubber systems.
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