Hastelloy C22 Pipes & Tubes

Hastelloy C22 Pipes & Tubes – ASTM B622 / B619 / B626 UNS N06022 Supplier in Mumbai, India

Nicorex Alloys is an ISO 9001 and ISO 14001 certified supplier of Hastelloy C22 seamless pipes, welded pipes, seamless tubes, and welded tubes, based in Mumbai, India. We supply these products manufactured to ASTM B622, ASTM B619, and ASTM B626.

Alloy C22 (UNS N06022, Werkstoff 2.4602) is a corrosion‑resistant nickel alloy containing about 56% nickel, 22% chromium, 13% molybdenum, and 3% tungsten. Its balanced Ni‑Cr‑Mo‑W composition lets it perform well in both reducing and oxidising acids, combining the strengths of C276 and C‑4. The relatively high chromium content (22%) is the key advantage, as it forms a strong, stable passive film that protects the metal in harsh oxidising environments. This includes media such as oxidising acids, ferric chloride solutions, and wet chlorine gas. C22 also offers an exceptional critical crevice temperature of 80°C in acidified 6% FeCl₃, the highest among commercial Ni‑Cr‑Mo alloys.

Hastelloy C22 pipes have a minimum tensile strength of 690 MPa (100 ksi) and 45% elongation in the solution-annealed condition, meaning they are strong yet ductile. Sizes range from NPS 1/2″ to 24″ in wall thicknesses from Schedule 5S to XXS. The alloy is non-magnetic and has a density of 8.69 g/cm³. Because the material resists weld sensitisation, no post-weld heat treatment is required, which simplifies fabrication in the shop or field. C22 pipes are widely used in chemical processing, FGD systems, pharmaceuticals, nuclear fuel reprocessing, oil and gas, pulp and paper, and marine service.

Hastelloy C22 Pipes & Tubes Specifications

The specifications of Hastelloy C22 pipe, including size, range, length and condition, are mentioned below in the table:

Seamless Pipe & Tube Standard	ASTM B622 / ASME SB622
Welded Pipe Standard	ASTM B619 / ASME SB619
Welded Tube Standard	ASTM B626 / ASME SB626
General Welded Pipe Standard	ASTM B775 / ASME SB775
Pipe Size (NPS)	1/2″ to 24″ (DN15 to DN600)
Pipe OD Range	21.3 mm to 610 mm
Tube OD Range	6.35 mm (1/4″) to 114.3 mm (4.5″)
Wall Thickness	0.89 mm to 59.54 mm (SCH 5S to XXS)
Schedules	5S, 10S, 10, 20, 40S, 40 (STD), 60, 80S, 80 (XS), 100, 120, 140, 160, XXS
Pipe Length	Single Random (3–5 m), Double Random (5–7 m), Fixed/Cut
Tube Length	Up to 12 m, or coiled
End Finish	Plain end, bevelled per ASME B16.25
Condition	Solution annealed at ≥1121°C (2050°F) + rapid water quench

Chemical Composition of Hastelloy C22 Pipes & Tubes

The chemical composition of Hastelloy C22 (UNS N06022) per ASTM B622 balances 22% Cr for oxidising-environment stability with 13% Mo for reducing-acid resistance.

Property	UNS	Werkstoff Nr.	EN	DIN	JIS	GOST	ISO
Designation	N10276	2.4819	NiMo16Cr15W	17751	NW 0276	ХН65МВУ (EP760)	6207 (tube)

With 22% Cr vs 16% in C276, C22 forms a stronger passive film in oxidising media (nitric acid, ferric/cupric chloride, wet chlorine), raising CCT from 55°C to 80°C. Its 13% Mo vs 16% makes it slightly less resistant in strongly reducing acids but comparable in mixed conditions. Ultra‑low C (≤0.01%) and Si (≤0.08%) prevent sensitisation, avoiding post‑weld heat treatment.

Mechanical Properties of C22 Hastelloy Pipes & Tubes

The mechanical properties of C22 Hastelloy Pipes and Tubes, along with their tensile strength, elongation and yield strength, are listed as follows:

Property	Tensile Strength, min	Yield Strength 0.2%, min	Elongation, min	Hardness, max (sour service)	Charpy V-Notch Impact, typical (RT)	Charpy V-Notch Impact, typical (-196°C)	Modulus of Elasticity
Value / Condition	690 MPa (100 ksi) — ASTM B622 / B619 / B626, RT	310 MPa (45 ksi) — ASTM B622 / B619 / B626, RT	45% — ASTM B622 / B619 / B626, RT	241 HBW (≤35 HRC) — NACE MR0175 / ISO 15156	568 J (419 ft-lbf) — RT	469 J (346 ft-lbf) — −196°C	206 GPa (29.9 × 10⁶ psi) — RT

C22 pipe yield (310 MPa min) exceeds C276 pipe (283 MPa min) by 27 MPa, allowing thinner wall selection in ASME B31.3 pressure design.

Physical Properties of Hastelloy C22 Pipes & Tubes

Physical properties of Hastelloy C22 pipes and tubes, including density, melting range, thermal conductivity, magnetic properties, and more, are covered in the table below:

Property	Density	Melting Range	Specific Heat	Thermal Conductivity	Modulus of Elasticity	CTE (24–100°C)	Magnetic Permeability	Electrical Resistivity
Value	8.69 g/cm³ (0.314 lb/in³)	1357–1399°C (2475–2550°F)	414 J/kg·°C at 50°C	10.1 W/m·°C at 50°C	206 GPa (29.9 × 10⁶ psi) at RT	12.4 µm/m·°C	Non-magnetic	1.14 µΩ·m at RT

C22’s pipe weight factor (1.107) is 2% lower than C276 (1.129). The CTE of 12.4 µm/m·°C is lower than that of austenitic stainless steels (~16), reducing thermal expansion stress. C22 is non-magnetic, suitable for instrumentation lines and subsea metering.

Hastelloy C22 Equivalent Grades

Hastelloy C22 has international equivalent designations, primarily UNS N06022 and Werkstoff Nr. 2.4602 and others listed below in the table:

Property	UNS	Werkstoff Nr.	EN	DIN	GOST	JIS
Designation	N06022	2.4602	NiCr21Mo14W	17744	ХН65МВУ	NW 0276

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Types of Hastelloy C22 Pipes & Tubes

Hastelloy C22 is available as seamless or welded pipes and tubes; the choice depends on pressure, corrosion, and cost.

Hastelloy C22 Seamless Pipe (ASTM B622)

Hastelloy C22 Welded Pipe (ASTM B619)

Hastelloy C22 Seamless Tube (ASTM B622)

Hastelloy C22 Welded Tube (ASTM B626)

Industries Using Hastelloy C22 Pipes & Tubes

Hastelloy C22 piping serves seven highly corrosive industries and often replaces C276 in multipurpose plants handling diverse process campaigns.

Chemical Processing (Multipurpose Plants): Used for transfer piping in multipurpose batch reactors, pharmaceutical intermediates, mixed‑acid catalysts, and fine chemical synthesis.
Flue Gas Desulphurisation (FGD): Applied in stack gas reheater lines and scrubber inlet ducting handling aggressive FGD liquors.
Pharmaceutical & Biotechnology: C22 is used in API synthesis lines and high‑purity electropolished tubing.
Nuclear Fuel Reprocessing: Installed in nitric acid process piping for nuclear service.
Oil & Gas / Petrochemical: Deployed in sour gas gathering, overhead condenser tubing, and amine regeneration circuits.
Pulp & Paper: Used in chlorine dioxide bleach plant piping.
Marine & Offshore: Selected for ballast systems and subsea flowlines.

How to Order Hastelloy C22 Pipes & Tubes

To order Hastelloy C22 pipes and tubes from Nicorex Alloys, provide the following 10 details:

Product Form: Seamless Pipe, Welded Pipe, Seamless Tube, Welded Tube
Applicable Standard: ASTM B622, B619, B626 / ASME equivalent
Size: NPS or OD × Wall Thickness
Schedule / Wall Thickness Requirement:
Length: Single Random, Double Random, Fixed, or Coil
End Finish: Plain End, Bevelled per ASME B16.25
Surface Finish Requirement
Testing Requirements: Hydrostatic, UT, Eddy Current, PMI
NACE MR0175 Compliance: (if required)
Certification: MTC 3.1 as per EN 10204

Frequently Asked Questions

What is the main advantage of Hastelloy C22 Pipe over Hastelloy C276 Pipe?

Hastelloy C22 contains 22% Cr vs 16% in C276, giving it superior resistance to oxidising acids and a higher CCT of 80°C vs 55°C in acidified 6% FeCl₃. C22 is best for flexible plants where process fluids keep changing between corrosive oxidising and reducing environments.

What is the price of Hastelloy C22 Pipe per Kg in India?

Hastelloy C22 pipe usually costs similar to C276. Price per kg depends on size, schedule, type (seamless/welded), and market rates. Contact Nicorex Alloys for quotes.

Is Hastelloy C22 Pipe suitable for Seawater Piping?

Yes. Hastelloy C22 pipe is suitable for seawater piping, demonstrating zero crevice corrosion in both still and flowing seawater.

What is the maximum service temperature for Hastelloy C22 Pipe?

C22 pipe is ASME Code-approved to 677°C (1250°F) under Section I and Section VIII Div. 1. For ASME B31.3 process piping, the code allows service to 427°C (800°F).

What is the difference between Hastelloy C22 and Hastelloy C-4 for Piping?

C-4 (UNS N06455) carries 16% Cr and 16% Mo, originally designed for oxidising environments. C22 (22% Cr, 13% Mo) provides better resistance in both oxidising and reducing conditions and has largely replaced C-4 as the preferred versatile alloy in the C-family.

What ASTM Standard covers Hastelloy C22 Seamless Pipe?

ASTM B622 / ASME SB622 covers seamless pipe and tube for UNS N06022. Welded pipe falls under ASTM B619 / ASME SB619, and welded tube under ASTM B626 / ASME SB626.