Hastelloy C276 Pipes & Tubes

Hastelloy C276 Pipes & Tubes Supplier in Mumbai, India

Nicorex Alloys is an ISO 9001 and ISO 14001 certified supplier, importer, and stockist for Hastelloy C276 seamless pipes, welded pipes, seamless tubes, and welded tubes based in Mumbai, India. We provide Alloy C276 pipes and tubes in accordance with the ASTM B622 / ASME SB622 standard.

UNS N10276 (Werkstoff 2.4819) is a nickel-molybdenum-chromium-tungsten wrought alloy with a nominal balance of 57% Ni, 16% Cr, 16% Mo, 4% W, and 5% Fe. The alloy was developed to overcome the weld sensitisation problem of the original Alloy C. The extremely low carbon (≤0.01%) and silicon (≤0.08%) are the key innovations that made C276 weldable without post-weld sensitisation. PREN ≈69 (Cr + 3.3×Mo). CPT exceeds 150°C in acidified 6% FeCl₃. No SCC in boiling 45% MgCl₂ after 1008 hours. CCT of 55°C in 6% FeCl₃. Minimum tensile strength is 690 MPa (100 ksi), yield strength is 283 MPa (41 ksi), and elongation is 40%. Charpy impact is 479 J at RT, 519 J at -196°C. It is non-magnetic (permeability 1.0002) and has a density of 8.89 g/cm³. Hastelloy C276 is a nickel alloy with long-term proven continuous field performance across both oxidising and reducing acid environments simultaneously. No other commercially available alloy matches this versatility in piping service.

At Nicorex Alloys, we provide Hastelloy C276 pipes as per ASTM B622 (seamless) and B619 (welded), tubes as per B622 (seamless) and B626 (welded). Sizes range from NPS 1/2″ to 24″, OD 6.35–610 mm, SCH 5S through XXS. Solution annealed at 1121°C (2050°F) + rapid water quench. No PWHT required. These pipes and tubes are NACE MR0175 / ISO 15156 compliant.

Specifications of Hastelloy C276 Pipes & Tubes

C276 pipes and tubes specifications, including standards, dimensions, schedules, finish, and conditions, are covered in detail in the table below:

Seamless Pipe & Tube	ASTM B622 / ASME SB622 (UNS N10276)
Welded Pipe	ASTM B619 / ASME SB619
Welded Tube	ASTM B626 / ASME SB626
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, 60, 80S, 80, 100, 120, 140, 160, XXS
Pipe Length	Single Random (3–5 m), Double Random (5–7 m), Fixed Cut
End Finish	Plain end, bevelled per ASME B16.25
Condition	Solution annealed 1121°C (2050°F) + rapid water quench

Chemical Composition of Hastelloy C276 Pipes

N10276 chemical composition and its key alloying elements, as per ASTM B622, are covered in the table below:

Material / Element	Nickel (Ni)	Chromium (Cr)	Molybdenum (Mo)	Tungsten (W)	Iron (Fe)	Cobalt (Co)	Vanadium (V)	Silicon (Si)	Carbon (C)	Manganese (Mn)	Phosphorus (P)	Sulfur (S)
Spec Range (%)	Balance	14.5–16.5	15.0–17.0	3.0–4.5	4.0–7.0	2.5 max	0.35 max	0.08 max	0.01 max	1.0 max	0.04 max	0.03 max
Nominal (%)	Balance	16	16	4	5	—	—	0.08	0.01	—	—	—

Low carbon (≤0.01%) is the defining innovation. Original Alloy C had higher C, causing grain boundary carbide precipitation during welding. C276 eliminated this, making it safe as-welded without PWHT. Low Si (≤0.08%) prevents µ phase. Mo (16%) resists reducing acids (HCl, H₂SO₄). Cr (16%) handles oxidising media (HNO₃, FeCl₃). Tungsten (4%) adds pitting resistance. PREN = Cr + 3.3(Mo + 0.5W) ≈ 69.

Mechanical Properties of C276 Hastelloy Pipes & Tubes

As per ASTM B622, the mechanical properties of UNS N10276, including tensile and yield strength, elongation, and other key properties in the solution annealed condition at 1121°C:

Property	Tensile Strength (min)	Yield Strength 0.2% (min)	Elongation (min)	Hardness (typical)	Charpy V-Notch (RT)	Charpy V-Notch (-196°C)	Tensile at 538°C
Value	690 MPa (100 ksi)	283 MPa (41 ksi)	40%	~83 HRB	479 J (353 ft-lbf)	519 J (383 ft-lbf)	601–613 MPa

C276 retains >600 MPa tensile at 538°C. Charpy impact increases at -196°C (519 J vs 479 J at RT), making C276 suitable for cryogenic and LNG piping. The 40% elongation enables field bending without cracking. Solid-solution strengthened (cannot be hardened by heat treatment).

Physical Properties of Hastelloy C276 Pipes & Tubes

C276 physical properties like density, melting point, thermal conductivity, elastic modulus, and other important properties are covered below:

Property	Density	Melting Range	Specific Heat	Thermal Conductivity (50°C)	Modulus of Elasticity	CTE (24–100°C)	Magnetic Permeability	Electrical Resistivity	Poisson’s Ratio
Value	8.89 g/cm³ (0.321 lb/in³)	1323–1371°C (2415–2500°F)	427 J/kg·°C at RT	10.5 W/m·°C	205 GPa (29.8 × 10⁶ psi)	11.2 µm/m·°C	1.0002 — Non-magnetic	1.23 µΩ·m at RT	0.31

Low thermal conductivity (10.5 W/m·°C, ~60% below carbon steel) affects heat exchanger tube selection. Non-magnetic: critical for instrumentation and subsea metering. CTE 11.2 µm/m·°C is lower than austenitic stainless (~16), reducing thermal stress in piping.

Equivalent Grades of Hastelloy C276 Pipes & Tubes

The standard equivalent designation of Hastelloy C276 pipes and tubes is UNS N10276. Other international equivalent designations are provided in the table below:

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

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Types of Hastelloy C276 Pipes & Tubes

C276 piping is specified in four ASTM product forms. Choice between seamless and welded depends on pressure, corrosion severity, and application.

Hastelloy C276 Seamless Pipe

Hastelloy C276 Welded Pipe

Hastelloy C276 Seamless Tube

Hastelloy C276 Welded Tube

Hastelloy C276 ERW Pipe

Industries Using C276 Hastelloy Pipes

C276 piping accounts for more tonnage than any other Ni-alloy piping grade. Its ability to resist both oxidising and reducing environments makes it the universal choice when stainless steels fail.

Reactor piping for mixed acids (H₂SO₄, HCl, HF), heat exchanger tubing in organic chloride solvents, evaporator tubes.
Sour gas gathering lines (NACE MR0175), wellhead piping, downhole tubing, amine units, and overhead condenser tubes in crude distillation.
Scrubber ducting, damper piping, and slurry transfer lines. FGD combines H₂SO₄, HCl, HF, and chlorides.
Bleach plant piping for ClO₂ and hypochlorite. Digester piping, evaporator tubes.
API synthesis piping in halogenated solvents, high-purity piping where corrosion contamination is unacceptable.
Seawater cooling piping, ballast systems, subsea flowlines. Resistant to seawater crevice corrosion.
Incineration off-gas piping and mixed acidic effluent handling.

How to Order Hastelloy C276 Pipes & Tubes from Nicorex Alloys

Provide the following 10 details to place an order for Hastelloy C276 :

Product Form: Seamless (ASTM B622) or Welded (ASTM B619 / B626)
Size: NPS and/or OD × Wall Thickness (mm) or BWG gauge
Schedule: As per the standard pipe schedule requirement
Length: Single random, double random, fixed cut length, or coil
Configuration: Straight, U-tube, or coiled (for tubes)
End Finish: Plain end or bevelled end as per ASME B16.25
U-Bend Radius: Specify radius requirement (if U-tube configuration)
Surface Finish: As-annealed, bright-annealed, or polished (pharma/food grade)
Testing Requirements: Hydrostatic, eddy current, ultrasonic (UT), or pneumatic testing
Compliance & Certification: NACE MR0175 (for sour service, if required) and MTC 3.1 as per EN 10204

Frequently Asked Questions

What ASTM Standard Covers Hastelloy C276 Seamless Pipe?

ASTM B622 / ASME SB622 covers seamless pipe and tube for N10276.

What is the Price of Hastelloy C276 Pipe per Kg in India?

C276 pipe costs 8–12× more than 316L due to 57% Ni, 16% Mo, and 4% W. Price varies by diameter, schedule, and manufacturing. Contact Nicorex Alloys for current pricing.

Is Hastelloy C276 Pipe Suitable for Hydrochloric Acid Service?

Yes. C276 holds corrosion rates below 0.5 mm/yr in 10% HCl at 38°C and 5% HCl at 52°C. The 16% Mo drives this outstanding reducing-acid performance.

What is the Maximum Operating Temperature for Hastelloy C276 Tubes?

Up to 677°C (1250°F) for continuous service. For corrosion applications, consult Haynes’ iso-corrosion diagrams. Retains >600 MPa tensile at 538°C.

How does Hastelloy C276 Pipe Compare to Inconel 625 Pipe?

C276 has nearly double the Mo (16% vs 9%), giving far superior HCl and H₂SO₄ resistance. In standard FeCl₃ pitting tests, the critical pitting temperature (CPT) for C276 is above 150°C, compared to roughly 100°C for Alloy 625. Choose C276 for reducing acids, wet chlorine, and FGD. Inconel 625 offers higher tensile (827 vs 690 MPa) at a lower cost for oxidising service.