Hastelloy C276 Pipe

ASME SB 622 Hastelloy C276 Pipes, Alloy C276 Pipes, Hastelloy Alloy C276 Pipes, ASTM B622 Hastelloy C276 Welded Pipes, Alloy C276 Seamless Tube, UNS N10276 Tubing suppliers, Nickel Alloy C276 Seamless Pipe supplier in India.

Hastelloy C276 Pipe and Tube (UNS N10276 / DIN 2.4819 / ASME SB622) is the most widely specified nickel-molybdenum-chromium alloy piping product in severe corrosion service globally. Combining high molybdenum (15–17%) and tungsten (3–4.5%) in a low-carbon nickel matrix, ASTM B622 Hastelloy C276 seamless pipe delivers outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC) across the broadest range of aggressive chemical environments of any standard nickel alloy. The ultra-low carbon content (0.01% max) suppresses grain-boundary carbide precipitation during welding, making Alloy C276 pipe suitable for use in the as-welded condition without post-weld heat treatment, a critical fabrication advantage in chemical plant, offshore, FGD, and pharmaceutical applications.

HASTELLOY is a registered trademark of Haynes International, Inc. Kalpataru Piping uses the designation for product identification purposes only. Explore our full Hastelloy Products range or read our Hastelloy C276 Material Properties Guide for a complete technical overview.

Why Specify Hastelloy C276 Pipe & Tube?

Hastelloy C276 is considered the most versatile corrosion-resistant alloy available in wrought pipe and tube form. It is one of the very few alloys resistant to wet chlorine gas, hypochlorite solutions, and chlorine dioxide solutions, environments that eliminate austenitic stainless steels and most other nickel alloys. Key reasons engineers specify UNS N10276 pipe over 316L, duplex, or Inconel 625:

• Broadest chemical resistance of any standard Ni-Mo-Cr alloy — reducing, oxidising, and mixed-acid environments
• No post-weld heat treatment (PWHT) required — suitable for as-welded chemical process fabrication
• Resistance to grain boundary precipitation in the weld heat-affected zone (HAZ)
• Exceptional pitting and crevice corrosion resistance in chloride-bearing media (seawater, FGD condensate, HCl)
• NACE MR0175 / ISO 15156 compliant — approved for sour gas service (H₂S + CO₂ + Cl⁻)
• Service temperature range: cryogenic (-196°C) to 1038°C (1900°F) oxidation resistance
• Improved fabricability over older Alloy C — available seamless, welded (ERW/EFW), cold-drawn, and U-bend

Hastelloy C276 Pipe Specification (ASTM B622 / ASME SB622)

All Kalpataru Piping Hastelloy C276 pipes and tubes are manufactured and supplied in compliance with the following international standards. Full dimensional data and schedule charts are provided below.

Types of Hastelloy C276 Pipe & Tube Supplied

• Hastelloy C276 Seamless Pipe (ASTM B622)
  ASTM B622 Hastelloy C276 seamless pipe is hot-extruded or cold-drawn from a solid billet, producing a pipe with no longitudinal weld seam. The seamless process preserves the full density and mechanical properties of the alloy, resulting in superior pressure-bearing capability and uniform wall thickness. C276 seamless pipe is the preferred specification for high-pressure chemical reactors, sour gas wellhead equipment, and heat exchangers where weld-zone integrity is critical. Available from 4 mm OD × 0.5 mm wall to 219 mm OD × 20 mm wall.
• Hastelloy C276 Welded Pipe (ASTM B619)
  ASTM B619 UNS N10276 welded pipe is manufactured from Alloy C276 strip or plate, rolled and longitudinally seam-welded, then solution-annealed and pickled. The welded process enables the production of larger diameters (up to 1219.2 mm OD) and longer single-piece lengths not achievable by seamless extrusion. C276 welded pipe is widely used for large-bore FGD ducting, offshore structural piping, and chemical plant headers where the cost advantage of welded construction is accepted by the design code.
• Hastelloy C276 ERW / EFW Tube (ASTM B626)
  ASTM B626 Hastelloy C276 welded tube (ERW/EFW) covers small-bore, thin-wall tubing for instrumentation, heat exchanger, and condenser applications. Alloy C276 ERW tube provides cost-effective performance in corrosive process streams where seamless tube wall integrity requirements can be met by the welded process. Available in wall thicknesses from 0.010″ and a comprehensive range of OD sizes from 1/16″ to 3½”.
• Cold-Drawn Hastelloy C276 Tube
  Cold-drawn Hastelloy C276 tube (CDW) delivers tighter dimensional tolerances on OD, ID, and wall thickness compared to hot-worked seamless, making it the standard for precision instrumentation tubing, hydraulic lines, and heat exchanger bundles. The cold-drawing process also improves surface finish. Supplied solution-annealed and pickled (ASTM B622 / ASME SB622); available in bright-annealed finish for pharmaceutical and food-grade applications.
• Heat Exchanger & Boiler Tube
  Hastelloy C276 heat exchanger tube (UNS N10276 boiler tube) is specified for shell-and-tube exchangers, condensers, evaporators, and feed-water heaters in chemical processing, pharmaceutical, and power generation service. C276 heat exchanger tube can be supplied with automatic-shape processing, nitrogen-protection annealing, ultrasonic testing, and cold-drawing to tight tolerance for precision tube-to-tubesheet joints.

Alloy C276 Pipe Chemical Composition (ASTM B622 / UNS N10276)

The following chemical composition limits apply to Hastelloy C276 pipes and tubes per ASTM B622 / B619 / B626. All values in weight percent (wt%). Material Test Reports (MTRs) certifying heat chemistry are supplied with every consignment. 

Note: Mn max 1.0%, Si max 0.08%, P max 0.04%, S max 0.03%, V max 0.35%. The ultra-low carbon (0.01% max) and silicon (0.08% max) limits are the key to C276 pipe’s weld-zone corrosion resistance, these suppress grain-boundary carbide and silicide precipitation in the heat-affected zone, enabling as-welded service in most chemical environments.

Nickel Alloy C276 Equivalent Material Grades & Trade Names

UNS N10276 is produced under several designations and trade names internationally. All share identical nominal chemistry and meet ASTM B622 / B619 / B626 specification requirements:

 Note: The above are trade names and/or trademarks of specific manufacturers including Haynes International, Inc., VDM Metals, and Special Metals Corporation. Kalpataru Piping is not affiliated with any of these manufacturers. Names are listed solely to identify products consistent with the listed UNS / DIN specifications.

Alloy C276 Pipe & Tube Mechanical Properties

The following Hastelloy C276 mechanical properties apply in the solution-annealed condition as per ASTM B622 / B619 minimum specification requirements:

 Note: ASTM B622 specifies UTS 690 MPa / yield 283 MPa minimum for solution-annealed seamless pipe. Typical (not minimum) values for cold-drawn material are higher: UTS ~790 MPa, yield ~355 MPa at 0.2% offset, consistent with the values shown in the original product specification table above. Always confirm the required condition (annealed vs cold-drawn) when ordering.

Hastelloy C276 Pipe Physical Properties

Hastelloy C276 Pipe Corrosion Resistance

Hastelloy C276 pipe and tube is specified for corrosion service because it resists a uniquely broad range of aggressive chemical environments. Key corrosive media where UNS N10276 pipe outperforms 316L stainless steel, duplex, and most other nickel alloys: 

Reducing Acid Environments

• Hydrochloric acid (HCl) — all concentrations below 40°C; dilute HCl to boiling. Superior to Inconel 625 (Mo 9%) and all stainless steels.
• Sulfuric acid (H₂SO₄) — wide concentration range including hot dilute H₂SO₄ where 316L and duplex fail.
• Phosphoric acid — excellent across a broad concentration and temperature range
• Formic and acetic acids, acetic anhydride — pharmaceutical and fine chemical process streams

Oxidising and Mixed Environments

• Wet chlorine gas — one of the very few alloys resistant to wet Cl₂ and hypochlorite solutions
• Ferric chloride (FeCl₃) and cupric chloride (CuCl₂) — strong oxidising chloride pitting solutions
• Chlorine dioxide solutions (bleach plant in pulp and paper)
• Flue gas condensate (FGD) — SO₂ + HCl + HF in solution; the dominant material for absorber vessels and ducting

Chloride / Seawater / Sour Gas

• Seawater and brine — high PREN (~70); resists pitting and crevice attack in stagnant or flowing seawater
• Sour gas (H₂S + CO₂ + Cl⁻) — NACE MR0175 / ISO 15156 compliant; resists stress corrosion cracking
• Halide-bearing organic process streams — chlorinated solvents, reaction intermediates

Stress Corrosion Cracking (SCC) Resistance

Unlike austenitic stainless steels (316L, 304), which are prone to chloride stress corrosion cracking above ~60°C in the presence of tensile stress, Hastelloy C276 pipe is highly resistant to SCC across its full service temperature range. This makes it the alloy of choice for welded vessels, piping, and heat exchangers where chloride exposure, structural stress, and elevated temperature would eliminate stainless steel as a material option.

Hastelloy C276 Pipe & Tube Industry Applications

Hastelloy C276 pipes and tubes are used in the most demanding process applications across multiple industries:

Chemical & Petrochemical Processing

• Reactors, columns, and heat exchangers handling HCl, H₂SO₄, phosphoric acid, and mixed-acid streams
• Organic chloride process equipment — vinyl chloride, chlorobenzene, chlorinated solvents
• Equipment for processes using halide or acid catalysts
• Sulfuric acid reactors, evaporators, and concentration plants

Flue Gas Desulfurisation (FGD)

• FGD scrubbers: absorber vessels, spray lances, ducting, mist eliminators — C276 is the benchmark material
• Pollution control equipment handling wet SO₂, HCl, and HF condensate

Oil & Gas — Upstream and Sour Service

• Sour gas service: wellhead components, tubing hangers, Christmas tree piping under NACE MR0175
• Downhole completion tools in high-chloride, high-CO₂ wells
• FPSO topside and subsea piping in aggressive seawater service

Pulp & Paper

• Digesters and bleach plant piping — chlorine dioxide, sodium hypochlorite service
• Black liquor evaporator tubes and white liquor circuits

Pharmaceutical & Food Processing

• Multi-purpose API reactor vessels, agitators, and pipework
• Food-contact and hygienic piping — low magnetic permeability, smooth BA finish, GMP-compatible
• Highly corrosive chemical intermediates in fine chemical synthesis

Marine, Power & Environmental

• Seawater handling and desalination systems
• Industrial and municipal wastewater treatment
• Power plant heat exchangers in aggressive cooling water service

Hastelloy C276 Seamless Pipe vs Welded Pipe: When to Specify Which

Hastelloy C276 Seamless Pipe Dimensions & Schedule Chart

The table below shows Hastelloy C276 pipe dimensions per ASME B36.19 / ASME B36.10M for standard schedules. All weights in kg/m based on alloy density of 8.89 g/cm³. 

Maximum Allowable Working Pressure (MAWP)

Maximum working pressures for Hastelloy C276 seamless pipe per ASME B31.3 Process Piping Code at ambient temperature (from ASME allowable stress, with E=1.0 mill tolerance):

Note: Pressures shown are approximate indicative values. Always calculate design working pressure using ASME B31.3 formula with the applicable allowable stress from ASME Section II Part D Table A and the specified weld joint efficiency factor E. Contact Kalpataru Piping for MAWP certificates on specific size / schedule combinations.

Quality Assurance, Testing & Certifications

Every consignment of Kalpataru Piping Hastelloy C276 pipes and tubes undergoes a rigorous quality programme before despatch:

Testing Performed

• Chemical analysis (PMI) — positive material identification by XRF for every heat
• Mechanical testing — tensile, yield, elongation per ASTM B622 / B619 requirements
• Hardness testing — Rockwell B / Brinell per specification
• Intergranular corrosion test (IGC) — ASTM A262 / G28 as required by specification
• Pitting resistance test — ferric chloride immersion per ASTM G48 where specified
• Hydrostatic / pneumatic pressure test per ASTM B622 / applicable code
• Ultrasonic testing (UT) — 100% UT on seamless pipe where required
• Radiographic testing (RT) — 100% X-ray on EFW pipe as standard
• Macro / micro examination — weld zone structure verification
• Dimensional inspection — OD, wall thickness, ovality, straightness per ASME B36.19

Documentation Supplied

• Material Test Certificate (MTC) — EN 10204 / 3.1B certification with full chemical and mechanical test results
• Commercial Invoice and Packing List
• Fumigation Certificate (for wooden packaging, export consignments)
• Material Traceability Report — heat number traceability to mill certificates
• NACE MR0175 / ISO 15156 Compliance Certificate (sour service applications)
• Third-party inspection reports (SGS, Bureau Veritas, TÜV, Lloyds — on request)
• PED 2014/68/EU compliance documentation (European projects — on request)

Related Hastelloy C276 Products from Kalpataru Piping

Kalpataru Piping supplies the complete range of Hastelloy C276 (UNS N10276) product forms. All products are supplied with ASTM-certified MTRs:

•       Hastelloy C276 Plates & Sheets — ASTM B622 hot-rolled and cold-rolled
•       Hastelloy C276 Round Bars & Wires — ASTM B574 bar
•       Hastelloy C276 Flanges — ASME B16.5 / B16.47 all types
•       Hastelloy C276 Buttweld Fittings — ASTM B366 elbows, tees, reducers
•       Hastelloy C276 Fasteners — studs, bolts, nuts, washers
•       Browse all Hastelloy Products — complete product range
•       View all Nickel Alloy Products — full nickel alloy supply range
•       Hastelloy C276 Material Properties Guide — composition, corrosion data, alloy selection guide

Frequently Asked Questions About Hastelloy C276 Pipe & Tubes

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