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.	Bal.	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?)

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.
Resistance to Pitting & Crevice Corrosion: Has a high Critical Pitting Temperature (CPT) and Crevice Corrosion Resistance, making it ideal for contaminated acids.
Stress Corrosion Cracking (SCC): Highly resistant to chloride-induced SCC.

Application

Chemical Processing: Handling hot contaminated acids (sulfuric, hydrochloric, phosphoric).
Flue Gas Desulfurization (FGD): Ducts and dampers in coal-fired power plants.
Pharmaceutical & Food: Where equipment must withstand harsh cleaning agents (bleach/chlorine).
Waste Treatment: Hazardous waste incinerators and scrubber systems.

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Studded Tube

Solid Fin Tube

Serrated Finned tube

Embedded G Fin Tube

Extruded Fin Tube

Wound Fin Tube

Low Fin Tube

Square Fin Tube

Longitudinal Finned Tube

Enhanced Heat Transfer Tube

Fin Tube Support

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Stainless Steel Heat Exchanger Tube

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